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SDM-650B

Satellite Modem

Installation and Operation Manual

Part Number MN/SDM650B.IOM

Revision 5

Summary of content (348 pages)

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SDM-650B Satellite Modem Installation and Operation Manual Part Number MN/SDM650B.
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EFData Corporation is an ISO 9001 Registered Company SDM-650B Satellite Modem Installation and Operation Manual Part Number MN/SDM650B.IOM Revision 5 May 28, 1996 Special Instructions: This is the sixth edition of the manual. Change bars were not utilized. This revision supersedes part number MN/SDM650 Rev. 4 dated May 5, 1995. Copyright © EFData Corporation, 1995, 1996. All rights reserved. Printed in the USA.
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Warranty Policy This EFData Corporation product is warranted against defects in material and workmanship for a period of one year from the date of shipment. During the warranty period, EFData will, at its option, repair or replace products that prove to be defective. For equipment under warranty, the customer is responsible for freight to EFData and all related custom, taxes, tariffs, insurance, etc.
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Preface About this Manual This manual provides installation and operation information for the EFData SDM-650B satellite modem. This is a technical document intended for earth station engineers, technicians, and operators responsible for the operation and maintenance of the SDM-650B satellite modem. Organization This manual includes the following chapters and appendixes: Rev. 5 • Chapter 1 — describes the unit’s purpose, function, description, options, and system specification.
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Preface SDM-650B Satellite Modem • Appendix B — describes the unit’s remote control operation protocol and command structure. • Appendix C — provides field compatibility specifications. • Appendix D — provides software change instructions. • Appendix E — describes the unit’s Automatic Gain Control (AGC) interface option. • Appendix F — describes the asynchronous overhead channel unit option. • Appendix G — describes the Trojan interface option. • Glossary.
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SDM-8000 Satellite Modem Preface References Used in this Manual Military Standards References to “MIL-STD-188” apply to the 114A series (i.e., MIL-STD-188-114A), which provides electrical and functional characteristics of the unbalanced and balanced voltage digital interface circuits applicable to both long haul and tactical communications.
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Preface SDM-650B Satellite Modem European EMC Directive In order to meet the European Electro-Magnetic Compatibility (EMC) Directive (EN55022, EN50082-1), properly shielded cables for DATA I/O are required. More specifically, these cables must be double-shielded from end-to-end, ensuring a continuous ground shield. The following information is applicable for the European Low Voltage Directive (EN60950): ! Type of power cord required for use in the European Community.
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SDM-8000 Satellite Modem Preface Customer Support Contact the EFData Customer Support Department for: • • • • • Product support Information on returning a product Information on upgrading a product Product training Reporting comments or suggestions concerning manuals An EFData Customer Support representative may be reached at: EFData Corporation Attention: Customer Support Department 2105 West 5th Place Tempe, Arizona 85281 USA (602) 968-0447 (Main EFData Number) (602) 517-2444 (Customer Support Desk) (
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Preface SDM-650B Satellite Modem This page is intentionally left blank. vi Rev.
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Table of Contents CHAPTER 1. INTRODUCTION.................................................................................. 1–1 1.1 Purpose and Function ..................................................................................................................................1–2 1.2 Description ....................................................................................................................................................1–3 1.3 System Specification................................
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Table of Contents SDM-650B Satellite Modem 3.1.1.7 Utility Defaults ................................................................................................................................3–5 3.1.2 Remote Interface Specification...............................................................................................................3–6 3.1.3 M&C Theory of Operation .....................................................................................................................3–6 3.
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SDM-650B Satellite Modem Table of Contents 3.6.1.1.1 Modem Settings (Master).......................................................................................................3–52 3.6.1.1.2 Modem Settings (Slave).........................................................................................................3–52 3.6.1.2 Master/Slave G.703 .......................................................................................................................3–53 3.6.1.3 Master/Slave X.21 .......
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Table of Contents SDM-650B Satellite Modem CHAPTER 6. MAINTENANCE................................................................................... 6–1 6.1 System Checkout ..........................................................................................................................................6–1 6.1.1 Modulator ...............................................................................................................................................6–1 6.1.2 Demodulator ..............
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SDM-650B Satellite Modem Table of Contents B.1.3.6.3 Select Modulator Rate Variable ............................................................................................. B–8 B.1.3.7 Demodulator Rate .......................................................................................................................... B–9 B.1.3.7.1 Demodulator Filter Rate Assignment ..................................................................................... B–9 B.1.3.7.2 Select Demodulator Rate .......
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Table of Contents SDM-650B Satellite Modem B.1.4.16 Bulk Consolidated Status Faults ................................................................................................ B–30 B.1.4.17 Change Status ............................................................................................................................ B–31 B.1.4.18 Equipment Type......................................................................................................................... B–32 B.
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SDM-650B Satellite Modem Table of Contents B.2.6 System Commands/Responses ............................................................................................................ B–49 B.2.6.1 Time of Day................................................................................................................................. B–49 B.2.6.2 Date.............................................................................................................................................. B–50 B.2.6.
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Table of Contents SDM-650B Satellite Modem B.2.8.20 Change Status ............................................................................................................................ B–72 B.2.8.21 Equipment Type......................................................................................................................... B–72 B.2.8.22 Bulk Consolidated Status AUPC ............................................................................................... B–72 APPENDIX C.
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SDM-650B Satellite Modem Table of Contents F.5.2.3.1 Modulator Faults (Mod_FLTS) .............................................................................................F–31 F.5.2.3.2 Demodulator/Decoder Faults (Dmd_Flts) .............................................................................F–31 F.5.2.3.3 Common Equipment Faults (CEq_Flts).................................................................................F–31 F.5.2.3.4 Transmit Faults (TX_INTF) ...................................
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Table of Contents SDM-650B Satellite Modem G.6.4.1.3.3 Select Modulator Rate Variable.................................................................................... G–21 G.6.4.1.3.4 Set Modulator Power Offset ......................................................................................... G–21 G.6.4.1.3.5 Set Modulator Output Power Level .............................................................................. G–22 G.6.4.1.3.6 Scrambler Enable ...........................................
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SDM-650B Satellite Modem Table of Contents G.6.4.5.12.1 Modulator Stored Faults ............................................................................................. G–39 G.6.4.5.12.2 Demodulator Stored Faults ......................................................................................... G–39 G.6.4.5.12.3 Common Equipment Stored Faults ............................................................................. G–39 G.6.4.5.13 Bulk Consolidated Status ..................................
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Table of Contents SDM-650B Satellite Modem Figures Figure 1-1. SDM-650B....................................................................................................................................1–1 Figure 1-2. Satellite Communications System with an SDM-650B ................................................................1–2 Figure 1-3. Modular Construction ...................................................................................................................1–4 Figure 1-4.
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SDM-650B Satellite Modem Figure E-1. Figure E-2. Figure E-3. Figure F-1. Figure F-2. Figure G-1. Rev. 5 Table of Contents Rear Panel View .......................................................................................................................... E–2 Wiring Diagram........................................................................................................................... E–4 AGC Adapter Board ...................................................................................
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Table of Contents SDM-650B Satellite Modem Tables Table 1-1. Operating Specifications ................................................................................................................1–5 Table 1-2. BER Performance Specifications ...................................................................................................1–7 Table 2-1. Rear Panel Connectors ...................................................................................................................2–2 Table 3-1.
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Chapter 1. INTRODUCTION This manual describes the SDM-650B satellite modem, referred to in this document as “the modem” (Figure 1-1). Figure 1-1. SDM-650B Rev.
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Introduction SDM-650B Satellite Modem 1.1 Purpose and Function The modem is a high performance, full-duplex, Bi-Phase Shift Keying/Quadrature Phase Shift Keying (BPSK/QPSK), digital modulator/demodulator (modem), for Frequency Division Multiple Access (FDMA) satellite communication systems. The modem provides an interface between Single Channel Per Carrier (SCPC) fixed-rate terminal equipment, having a data rate of 19.2 kbit/s to 3.584 Mbit/s.
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SDM-650B Satellite Modem Introduction The modem contains: • Built-in scrambler/descrambler • Differential encoder/decoder • Transmit and receive frequency synthesizers • Multi-rate Forward Error Correction (FEC) convolutional encoder-sequential decoder (Viterbi K=7 is optional) The modem provides high performance with: • • • • Narrow occupied bandwidth Automatic signal acquisition High flexibility Extensive online monitoring circuits 1.
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Introduction SDM-650B Satellite Modem Figure 1-3. Modular Construction Test points are located on the front board edge of the modulator, demodulator, and decoder PCBs. Refer to Section 6.1.4 for listings and diagrams of the test points. All controls and indicators for operation of the modem are located on the front panel. For more information, refer to Chapter 4. The chassis also contains the power supply; a fan is located on the rear panel.
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SDM-650B Satellite Modem Introduction 1.3 System Specification Table 1-1 lists the operating specifications of the modem. Table 1-1. Operating Specifications System Specifications Operating Frequency Range Type of Modulation Operating Channel Spacing BER Digital Interface Digital Data Rate: Variable Rate Single Rate Forward Error Correction Data Scrambling Diagnostic Features Prime Power Size 50 to 90 MHz, or 100 to 180 MHz. Synthesized in 2.5 kHz steps. QPSK. BPSK. Less than 0.
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Introduction SDM-650B Satellite Modem Additional Demodulator Specifications Input Power: Desired Carrier Composite Input Impedance Input Return Loss Carrier Acquisition Range Clock Acquisition Range -30 to -55 dBm. +30 dB power within 20 MHz from desired carrier. +40 dB power outside of 20 MHz from desired carrier. 0 dBm maximum composite. 75Ω. 20 dB. ± 25 kHz minimum. ± 100 PPM. Remote Control Specifications RS-232-C, or RS-485. 300 to 9600 bit/s. Transmit Frequency. Receive Frequency Transmit Power.
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SDM-650B Satellite Modem Introduction The specifications for the Bit Energy-to-Noise Ratio (Eb/N0) required to achieve 10-5 and 10-7 BER for different coding configurations is listed in Table 1-2. All values are for operation in QPSK mode. Table 1-2. BER Performance Specifications Data Rate 1/2 Rate 100 kbit/s BER 10-5 BER 10-7 1544 kbit/s BER 10-5 BER 10-7 Sequential 3/4 rate 7/8 Rate Viterbi K=7 1/2 Rate 4.8 dB 5.8 dB 5.8 dB 6.6 dB 6.7 dB 8.0 dB 5.5 dB 6.7 dB 5.8 dB 6.6 dB 6.3 dB 7.1 dB 6.
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Introduction SDM-650B Satellite Modem 10-2 10-3 10-4 10-5 10-6 BER 10-7 10-8 100 kbit/s 1544 kbit/s SPECIFICATIONS 10-9 10-10 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 Eb/N0 (dB) Figure 1-4. Sequential Decoder BER Performance Curves (1/2 Rate) 1–8 Rev.
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SDM-650B Satellite Modem Introduction 10-2 10-3 10-4 10-5 10-6 BER 10-7 10-8 100 kbit/s 1544 kbit/s SPECIFICATIONS 10-9 10-10 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 Eb/N0 (dB) Figure 1-5. Sequential Decoder BER Performance Curves (3/4 Rate) Rev.
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Introduction SDM-650B Satellite Modem 10-2 10-3 10-4 10-5 10-6 BER 1544 kbit/s 100 kbit/s 10-7 SPECIFICATIONS 10-8 10-9 10-10 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 Eb/N0 (dB) Figure 1-6. Sequential Decoder BER Performance Curves (7/8 Rate) 1–10 Rev.
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SDM-650B Satellite Modem Introduction 10-2 10-3 10-4 10-5 10-6 BER 10-7 100 kbit/s or 1544 kbit/s 10-8 SPECIFICATIONS 10-9 10-10 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 Eb/N0 (dB) Figure 1-7. Viterbi Decoder BER Performance Curves (1/2 Rate) Rev.
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Introduction SDM-650B Satellite Modem Figure 1-8. SDM-650B Typical Output Spectrum 1–12 Rev.
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Chapter 2. INSTALLATION This chapter provides the following information: • • • • Unpacking instructions External connections System requirements System installation 2.1 Unpacking The modem and manual are packaged in pre-formed, reusable, cardboard cartons containing foam spacing for maximum shipping protection. The three main circuit boards are packed in separate cardboard caddypacks (included within the cardboard carton).
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Installation SDM-650B Satellite Modem 4. Save the packing material for storage or reshipment purposes. 5. Inspect the equipment for any possible damage incurred during shipment. 6. Check the equipment against the packing list to ensure the shipment is complete. 7. Refer to Section 2.4 for further system installation instructions. 2.2 External Connections Connections between the modem and other equipment are made through six connectors.
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SDM-650B Satellite Modem Installation 2.2.1 DATA I/O For information and pinouts on the data connectors, refer to Chapter 3. 2.2.2 Remote (J6) The remote connector on the modem is used to interface the Monitor and Control (M&C) functions to a remote location. This interface can be either RS-232-C or RS-485. For a complete discussion on the remote interface, refer to Chapter 3. The remote interface is provided on a 9-pin female D connector.
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Installation SDM-650B Satellite Modem The fault interface is provided on a 9-pin female D connector. Screw locks are provided for mechanical security on the mating connector. Pin # 1 2 3 4 5 6 7 8 9 Name NO COM NC NO COM NC NO COM NC Function Common equipment is OK Common equipment is faulted Modulator is OK Modulator is faulted Demodulator is OK Demodulator is faulted Note: A connection between the common (COM) and normally open (NO) contacts indicates no fault. 2.2.
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SDM-650B Satellite Modem Installation 2.2.7 GROUND A #10-32 stud is available on the rear panel for the purpose of connecting a common chassis ground between all of the equipment. 2.3 System Requirements The standard modem with all cards installed (as listed in Chapter 1) is a full-duplex QPSK satellite modem. The system can also be configured for TX-only or RX-only operation: • For a TX-only system, the demodulator (AS/0778-X) and decoder (AS/0365-X) are removed.
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Installation SDM-650B Satellite Modem 2.4 System Installation After unpacking, install the modem as follows: 1. Mount the modem chassis in its assigned position in the equipment rack. 2. Connect the cables to the rear panel in the appropriate locations. Refer to Section 2.2 for connector pinouts, placement, and functions. 3. Open the front panel and verify the three main cards, the M&C, and data interface cards are properly seated. Refer to Figure 1-3 for proper positioning of the cards.
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Chapter 3. CONFIGURATION This chapter provides the following information: • • • • • • Monitor and control Digital interfaces Doppler buffer assembly Doppler buffer specification I/O connectors Interface clocking options 3.1 Monitor and Control The modem uses a sophisticated microcontroller module to perform the M&C functions of the modem (refer to Figure 3-1). The M&C monitors the modem, and provides configuration updates to other modules within the modem when necessary.
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Configuration SDM-650B Satellite Modem Figure 3-1. M&C Card 3.1.1 Description of Options 3.1.1.1 Remote Interface All modem functions can be remotely controlled and monitored via an RS-485 (optional RS-232-C) communications link. • The 2-wire, half-duplex RS-485 interface makes it possible to operate 255 modems on a common communications link. • The RS-232-C interface is used to communicate with a single modem. The M&C module must be hardware configured to one of the two interfaces.
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SDM-650B Satellite Modem Configuration 3.1.1.2 Remote Baud Rate The remote communications baud rate and parity are programmed by a switch pack (SP1) on the M&C module. Programming the baud rate and parity is accomplished by setting the appropriate switches in the OFF or ON positions: • A switch is programmed OFF by placing it in the position furthest away from the PCB (open). • A switch is programmed ON by placing it in the position nearest the PCB.
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Configuration SDM-650B Satellite Modem 3.1.1.3 Remote Address Each modem must be configured for a distinct address between 1 and 255 to communicate using the established remote communications protocol. Addresses are programmed by a switch pack (SP2) on the M&C module. Addresses are binary coded numbers set at SP2. Switch #1 (SP2-1) is the most significant bit, and switch #8 (SP2-8) is the least significant bit. 3.1.1.
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SDM-650B Satellite Modem Configuration 3.1.1.
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Configuration SDM-650B Satellite Modem 3.1.2 Remote Interface Specification Refer to Appendix B for remote control operation information. 3.1.3 M&C Theory of Operation The M&C module is built around the Intel 80C31 microcontroller operating at 5.5295 MHz. The microsystem is designed to support: • • 64K bytes of read-only code memory 64K bytes of random access data memory Of the 64K bytes data memory, only 4K is used for RAM. The remaining address is used for memory-mapped I/O.
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SDM-650B Satellite Modem Configuration 3.2 Digital Interfaces 3.2.1 RS-422 and MIL-STD-188-114 Interface 3.2.1.1 Functional Description The RS-422 and MIL-STD-188-114 digital interface (Figure 3-2) provides the level translation, buffering, and termination between the internal modem signals and the RS-422 or MIL-STD-188-114 interface connector on the rear panel. A functional block diagram of the interface is shown in Figure 3-3.
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Configuration SDM-650B Satellite Modem Electrical characteristics of the RS-422 interface signals are defined in EIA-STD-RS-422. Electrical characteristics of the MIL-STD-188-114 interface signals are defined in MIL-STD-188-114 and MIL-STD-188-100. • EIA-STD-RS-449 provides details of the mechanical interface. • MIL-STD-188-114 defines signal levels, offsets, termination resistors, etc. • MIL-STD-188-100 specifies such characteristics as signal quality and clock/data phase relationships.
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SDM-650B Satellite Modem Configuration The RS-422 and MIL-STD-188-114 interface provides a Send Timing (ST) clock signal at the modem data rate. In the Internal Clock mode, the data to be transmitted, Send Data (SD), must be synchronized to ST. In the External Clock mode, the clock is accepted on the Terminal Timing (TT) input to clock in the data to be transmitted.
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Configuration SDM-650B Satellite Modem Loop timing is supported by the selection of jumper JP10. When in the ON position, the transmit clock (ST) is replaced by the clock recovered from the satellite (RT). Active loop timing is indicated by a yellow light on the front edge of the card. The JP10 REM setting is for future options.
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SDM-650B Satellite Modem Configuration Table 3-1. AS/0627-3 Rev. E Board Jumper Selection JP1 TX Clock Select JP2 Interface Select JP3 RX Data JP8 RX Clock JP4 JP5 JP6 JP7 Address Set Address Set Address Set Address Set JP9 CTS to RTS JP10 Loop Timing JP11 JP12 ASYNC Clk Syn (-5) SCT JP13 RD JP14 RR JP15 DM JP16 SD Normal Invert Auto V.35 (-2) MIL-STD-188/RS-232-C (-3) Normal Buffer Normal Buffer 0 0 1 1 MIL (-3) V.35 (Processor controller for V.
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Configuration SDM-650B Satellite Modem 3.2.1.2 Connector Pinouts The RS-422 and MIL-STD-188-114 interface is provided on a 37-pin female D connector, accessible from the rear panel of the modem. Screw locks are provided for mechanical security of the mating connector.
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SDM-650B Satellite Modem Configuration 3.2.1.3 Specification Circuit Supported Amplitude (RD, RT, ST, DM, RR) DC Offset (RD, RT, ST, DM, RR) Impedance (RD, RT, ST, DM, RR) Impedance (SD, TT, MC) Polarity Phasing (RD, RT) Symmetry (ST, TT, RT) Frequency Stability (ST) Modulator Fault Demodulator Fault Rev. 5 SD, ST, TT, RD, RT, DM, RR, MOD, FAULT, DEMOD FAULT, MC. 4, ± 2V differential into 100Ω. 0, ± 0.4V. Less than 100Ω, differential. 100, ± 20Ω, differential. True when B positive wrt A.
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Configuration SDM-650B Satellite Modem 3.2.2 V.35 Interface 3.2.2.1 Functional Description The V.35 digital interface (Figure 3-4) provides level translation, buffering, and termination between the internal modem signals and the V.35 DCE interface connector on the rear panel. Electrical characteristics of the interface signals are defined in CCITT Recommendation V.35. The electrical and mechanical specifications are summarized in Section 3.2.2.2 and Section 3.2.2.3, respectively.
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SDM-650B Satellite Modem Configuration TO BUFFER OPTIONS LOOP TIMING TO LOGIC CONTROL SCT INT/EXT CLOCK TO CONTROL LOGIC ST LOOPBACK TO CONTROL LOGIC TT RT TX CLOCK M O D E M AUTO CLOCK SELECT SD RD TX DATA RX CLOCK INVERT NORM RX DATA EXTERNAL BUFFER CLOCK TO BUFFER OPTIONS MC CS COMMON EQUIPMENT RS FAULT MODULATOR RELAYS CONTROL LOGIC RTS TO CTS JUMPER T E R R E S T R I A L SPARE (RS-232 ONLY) DEMODULATOR TTL MODULATOR FAULT DATA BUS TO M & C TTL DEMODULATOR FAULT Figure 3-5
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Configuration SDM-650B Satellite Modem Data received by the modem is output on the RD lines, while the recovered clock is output on the Serial Clock Receive (SCR) lines. For applications that require the rising edge of the clock to occur in the middle of the data bit time, Receive Clock Normal mode should be selected. Invert mode puts the falling edge of SCR in the middle of the data bit. This selection can be made from the front panel in the Configuration menu.
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SDM-650B Satellite Modem Configuration Table 3-2 lists the jumper settings for the V.35 interface. These jumpers are factory set for a specific configuration. Clock selections, signal selections, and loop timing can be changed upon individual needs. Table 3-2. AS/0627-2 Rev.
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Configuration SDM-650B Satellite Modem 3.2.2.2 Connector Pinouts The V.35 interface is provided on the industry standard 34-pin block connector accessible from the rear panel of the modem. Screw locks are provided for mechanical security of the mating connector.
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SDM-650B Satellite Modem Configuration 3.2.2.3 Specification Circuit Supported Amplitude (RD, SCR, SCT, SD, SCTE) Amplitude (CTS, DSR, RLSD) Impedance (RD, SCR, SCT) Impedance (SD, SCTE) Impedance (RTS) DC Offset (RD, SCR, SCT) Polarity (SD, SCT, SCTE, RD, SCR) Polarity (RTS, CTS, DSR, RLSD) Phasing (SCTE, SCR) Symmetry (SCT, SCTE, SCR) Frequency Stability (SCT) Modulator Fault Demodulator Fault Rev. 5 SD, SCT, SCTE, RD, SCR, DSR, RLSD, MOD, FAULT, DEMOD FAULT, MC. 0.
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Configuration SDM-650B Satellite Modem 3.2.3 DS-1 Interface 3.2.3.1 Functional Description The DS-1 digital interface (Figure 3-6) provides level translation, buffering, and termination between the internal modem signals and the DS-1 DTE interface on the rear panel. SWITCH 1 Figure 3-6. DS-1 Interface Card The DS-1 standard is defined in Bell System Publication 62411. Refer to Figure 3-7 for a functional block diagram of the DS-1 interface. The DS-1 is a single data rate interface.
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SDM-650B Satellite Modem Configuration TO BUFFER OPTIONS DS-1 LINE RECEIVER/DRIVER TX CLOCK SD DS-1 DEJITTER M O D E M TX DATA RD LOOPBACK CONTROL RX CLOCK RX DATA EXTERNAL BUFFER CLOCK TO BUFFER OPTIONS COMMON EQUIPMENT MODULATOR FAULT RELAYS CONTROL MC T E R R E S T R I A L LOGIC DEMODULATOR TTL MODULATOR FAULT TTL DEMODULATOR FAULT DATA BUS TO M & C Figure 3-7. DS-1 Interface Block Diagram The data to be transmitted by the modem is input on the SD lines.
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Configuration SDM-650B Satellite Modem Table 3-3. Equalizer Control Distance to DSX (Ft) SW1 (See Note 2) (See Note 1) (applies only to 22–GA. PIC [ABAM] Cable) 0 to 133 133 to 267 167 to 400 400 to 533 533 to 655 Test Clear Maximum Cable Loss (dB at 772 kHz) 0.6 1.2 1.8 2.4 3.0 --- 4 3 2 EC1 C C C C O O EC2 C C O O C C EC3 C O C O C O Notes: 1. Other bit combinations represent test modes and are not used for normal operation. 2. Use maximum loss figures for other cable types.
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SDM-650B Satellite Modem Configuration 3.2.3.2 Connector Pinouts The DS-1 interface is provided on a 15-pin female D connector accessible from the modem rear panel. Screw locks are provided for mechanical security of the mating connector. Signal Function SEND DATA RECEIVE DATA MASTER CLOCK MODULATOR FAULT DEMODULATOR FAULT GROUND Name SD-A SD-B RD-A RD-B MC-A MC-B ------GND Pin # 1 9 3 11 7 8 14 15 2, 4 3.2.3.
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Configuration SDM-650B Satellite Modem 3.2.4 G.703, 2048 kbit/s Interface 3.2.4.1 Functional Description The G.703 2048 kbit/s digital interface (Figure 3-8) provides level translation, buffering, and termination between the internal modem signals and the G.703 DTE interface on the rear panel. SWITCH 1 G.703 N X 64KBITS SATELLITE MODEM INTERFACE ASSY/0679 REV-4 FSCN 4J515 Figure 3-8. G.703 2048 kbit/s Interface Card The G.703 standard is defined in CCITT Volume III (red book).
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SDM-650B Satellite Modem Configuration N X 64 KB CLOCK SYNTHESIZER TO BUFFER OPTIONS TX CLOCK SD DS-1 DEJITTER M O D E M TX DATA DS-1 LINE RECEIVER/ DRIVER RD LOOPBACK CONTROL RX CLOCK RX DATA EXTERNAL BUFFER CLOCK MC TO BUFFER OPTIONS COMMON EQUIPMENT FAULT RELAYS MODULATOR CONTROL T E R R E S T R I A L LOGIC DEMODULATOR TTL MODULATOR FAULT TTL DEMODULATOR FAULT DATA BUS TO M & C Figure 3-9. G.703 2048 Interface Block Diagram The G.
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Configuration SDM-650B Satellite Modem They are available on the FAULT connector on the modem rear panel. Generation of these fault conditions is described in Chapter 4. Table 3-4. G.703, 2048 kbit/s Interface Switch Configurations 1 X X 0 2 X X 0 3 X X 0 SW1 Positions 4 5 6 X X X X X X 0 0 1 7 0 1 X 8 0 0 X Function Selected AMI CODE HDB3 2048 kbit/s Switch Positions 0 CLOSED 1 OPEN X DON’T CARE Fault indicators are also provided on TTL open-collector drivers on the G.703 2048 kbit/s connector.
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SDM-650B Satellite Modem Configuration 3.2.4.3 Switch Configuration for G.703 2048 kbit/s Interface Switch 1 is an 8-position dip switch located at the end of the G.703 interface board. Table 3-4 lists the switch settings for data rates and available coding for the G.703 2048 kbit/s interface. 3.2.4.4 Connector Pinouts The G.703 2048 kbit/s interface is provided on a 15-pin female D connector accessible from the rear panel of the modem.
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Configuration SDM-650B Satellite Modem 3.2.4.5 G.703 2048 kbit/s Connector Board Option The G.703 2048 kbit/s interface has a connector board option that is configured with a 15-pin D and three BNCs for unbalanced signals for SD, RD, and MC (Figure 3-10). Refer to Table 3-5 for jumper connections. G.703 2048 KBS CONNECTOR BOARD SDM 650 AS/1644 REV___ S/N_________ J1 J2 J3 J4 S1 Notes: 1. 2. J5 Balanced signals are on the 15-pin D connector. Unbalanced signals are on the BNC connectors.
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SDM-650B Satellite Modem Configuration Table 3-5. G.703 2048 kbit/s Interface Connector Jumpers Switch J3 (EXT REF) BAL UNBAL ON ON OFF OFF X X X X X X X X SW1-1 SW1-2 SW1-3 SW1-4 SW1-5 SW1-6 J4 (SEND DATA) BAL UNBAL X X X X ON ON OFF OFF X X X X J5 (RECEIVE DATA) BAL UNBAL X X X X X X X X ON ON OFF OFF Switch Positions 0 CLOSED 1 OPEN X DON’T CARE The interface connects to the rear of the modem, directly onto the G.703 interface connector.
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Configuration SDM-650B Satellite Modem The G.703 2048 kbit/s optional connector board provides the balanced signals on a 15-pin female D connector. These signals are the same as the G.703 interface connector. Refer to Section 3.2.4.4 for the connector pinouts. The unbalanced signals are accessible from J3, J4, and J5. A description of available unbalanced signals and directions is described in the following paragraphs. 3.2.4.6 External Reference (J3) The external reference input signal has two inputs.
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SDM-650B Satellite Modem Configuration 3.2.4.9 Specification Pairs Circuits Supported Data Rate Pulse Width (RD) Line Code RD Amplitude SD Amplitude Jitter Attenuation (SD) Modulator Fault Demodulator Fault Symmetrical pair, coaxial pair optional. SD, RD, MOD FAULT, DEMOD FAULT. 2.048 Mbit/s, ± 50 PPM. 244, ± 25 ns. AMI or HDB3 (selectable). 3.00, ± 0.3V pk into a 120Ω termination. 3, ± 1.5V pk into a 100Ω termination. Exceeds CCITT G.823, specification for 2048 kbit/s. Open collector output. 15V max.
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Configuration SDM-650B Satellite Modem RECEIVE SECTION TRANSMIT SECTION ES TO ES ASYNC FRAMING/ TIMING LOGIC (MUX) RS-232 INTERFACE P/O INT LPBK P/O INT LPBK MODEM DEFRAME/TIMING LOGIC (DEMUX) RS-232 INTERFACE ES TO ES ASYNC TX DEJITTER G.703 CLK DATA CLK PLESIOCHRONOUS BUFFER P/O BASE BAND LPBK T1/E1 INTERFACE T2/E2 T1/E1 T2/E2 G.703 INTERFACE P/O BASE BAND LPBK RS-422 INTERFACE MIL-STD 188-114 RS-422 INTERFACE MIL-STD-188-114 V.35 INTERFACE CLK DATA CLK DATA V.
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SDM-650B Satellite Modem Configuration The “handshake” asynchronous signals are: • • • • • • RTS CTS DM DSR RR RLSD This board may otherwise contain the circuitry for transformer balanced data interfaces supporting CCITT G.703 parameters. Data inputs are SD, and outputs are RD. Data rates of 1.544, 2.048, 6.312, and 8.448 Mbit/s are supported. Note: 6 and 8 Mbit/s are not supported by the modem. Line codes for zero substitution are B6ZS, B8ZS, and HDB3. AMI is also supported.
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Configuration SDM-650B Satellite Modem Table 3-6. Asynchronous Overhead Jumper Table JP # JP1 JP2 JP3 JP10 JP11 JP12 JP8, JP9, JP13 Pin # Function 1 to 3, and 2 to 4 V.35, RS-422, MIL-STD-188 3 to 5, and 4 to 6 G.703 Auto TX CLK Phase Select 1 to 2 Fixed Phase, Normal 3 to 4 Fixed Phase, Inverted 5 to 6 1 to 2 G.703 data activity detect 2 to 3 TX Terr CLK activity detect 1 to 2 V.
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SDM-650B Satellite Modem Configuration 3.2.5.3 Multiplexer The data processor, AS/1289, forms the bottom of the 2-board module. This board contains the data multiplexer and demultiplexer. The synchronous data stream is multiplexed with a 1/15 overhead channel, and the resultant information is interfaced to the modulator/coder section of the modem. The input clock is normally the recovered clock from the terrestrial interface board (SCTE), but the modem reference clock can be used by selecting INT Clock.
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Configuration SDM-650B Satellite Modem 3.2.5.5 Plesiochronous Buffer User data from the DEMUX section is fed into a plesiochronous buffer. The buffer size is user selectable in 16-bit increments, from 384 to 262144 bits. The buffer is automatically centered on resumption of service after an outage, or may be commanded to center in the interface configuration section (from the front panel or remotely). For obvious reasons, manual centering will generally not be plesiochronous.
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SDM-650B Satellite Modem Configuration 3.2.5.7 Interface Connector Pinouts The asynchronous interface is provided on a 50-pin female D connector accessible from the rear panel of the modem. Screw locks are provided for mechanical security of the mating connector.
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Configuration SDM-650B Satellite Modem 3.2.5.8 Asynchronous Interface Specifications Main Channel MIL-STD-188-114. RS-422/-449. V.35. G.703. Data Rates 9.6K, 19.2K, 32 kbit/s to 8.448 Mbit/s. G.703 Data Rates 1.544 Mbit/s. (Jumper Selectable) 2.048 Mbit/s. 6.312 Mbit/s. 8.448 Mbit/s. G.703 Line Code AMI, B8ZS, B6ZS, HDB3. Transmit Clock Reference Internal modem reference or external transmit clock (SCT or TT). Jitter Attenuation Per G.703. Pulse Mask Per G.703.
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SDM-650B Satellite Modem Configuration 3.2.6 Asynchronous Breakout Panel The asynchronous breakout panel supports the use of the asynchronous interface in the modem. For more information, refer to the ASYNC Breakout Panel Installation and Operation Manual. Rev.
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Configuration SDM-650B Satellite Modem 3.3 Doppler Buffer The Doppler buffer assembly is an option that plugs on to the modem interfaces, that provides elastic buffering to the receive data channel. The Doppler buffer compensates for the effect of satellite movement or disparity between transmit and receive clocks, and can be used at data rates of 9.6 kbit/s to 2.5 Mbit/s. Note: 120Ω impedance-matching resistors are required on the AS/0627, AS/0569, and AS/0679 PCBs.
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SDM-650B Satellite Modem Configuration Table 3-8.
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Configuration SDM-650B Satellite Modem The formula for calculating the buffer depth is: Buffer Depth (bits) = Bit Rate (bit/s) x Max. Delay Variation Contact the satellite company to determine the delay variation of a particular domestic satellite. The buffer depth capacity can be set either through the M&C or manually with a DIP switch on the buffer. Jumpers and optional modem software determine if the control is local or through the M&C.
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SDM-650B Satellite Modem Configuration Figure 3-14. AS/3812 Doppler Buffer Daughter Card Pinouts on the 34-pin V.35 are: • • “c” for MC-A “d” for MC-B The pinouts on the 37-pin connector are: • • Pin 16 for MC-A Pin 34 for MC-B The electrical configuration of these lines is the RS-422. The jumper selection must be set to external clock in order to use the external reference. The asynchronous channel unit has a plesiochronous buffer and is selectable in 16-bit increments, from 384 to 262144 bits.
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Configuration SDM-650B Satellite Modem 3.3.1 Buffer Setup The receive buffer allows for: • Plesiochronous buffering of two dissimilar clock frequencies: the far end transmit clock and the local network clock frequency. The clocks may be very close in frequency to each other and will normally slip at a constant rate. Figure 3-15 shows plesiochronous operation of dissimilar clocks. If incoming traffic is too fast, an occasional bit will be lost.
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SDM-650B Satellite Modem Configuration F1 is not EXACTLY equal to f2. Plesiochronous Operation Too Fast Too Slow Bit 1 Bit 1 Bit 1 Bit 1 Bit 2 Bit 2 Bit 2 Bit 2 Error Bit 3 Error Bit 3 Bit 3 Bit 3 Bit 4 Bit 5 Bit 5 Bit 6 Bit 3 Bit 4 Bit 6 Bit 4 Bit 5 Bit 7 Bit 7 Bit 5 Interface Interface Figure 3-15. Clock Slip Diagram Rev.
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Configuration SDM-650B Satellite Modem 3.3.1.1 Buffer Size The depth of the receive buffer will depend upon four parameters: • • • • Doppler shift caused by satellite Stability of each clock (plesiochronous/Doppler operation only) Frame/multiframe length of multiplexed data format Allowable time between clock slips 3.3.1.2 Doppler A geostationary satellite with a 24-hour orbit should be positioned directly over the equator.
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SDM-650B Satellite Modem Configuration 3.3.1.3 Plesiochronous The stability of station reference clocks is normally 10-11 that is derived from a cesium standard. When the stability is exceptionally high, the two clocks are not in sync with each other. Eventually, the two reference clocks will pass by each other. The clock used for the transmit signal passes over the satellite, but will not be used at the receive earth station where a national network derives its timing locally.
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Configuration SDM-650B Satellite Modem 3.3.1.5 Total Buffer Length The size of the buffer will be determined by the Doppler, plesiochronous, and the frame and multiframe length (the last three sections). Using the three examples given in the last three sections, the total buffer depth (end to end) will be: Doppler + Plesiochronous ms (rounded up to the nearest multiframe) (e.g., 1.15 + 6.98 = 8.13 ms) If the multiframe length is 2 ms, then the nearest multiframe will be 10 ms, or 20480 bits. 3.3.1.
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SDM-650B Satellite Modem Configuration 3.4 Doppler Buffer Specification Buffer Size (bits) Clock Source Data Rate Indicators Controls Miscellaneous 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536 Receive, transmit, and external clock 9.6 kbit/s to 2.
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Configuration SDM-650B Satellite Modem 3.6 Interface Clocking Options Clocking of the data from the terrestrial circuits to the satellite, and vice versa, will depend upon the application. The most common options and recommended configurations are described in the following sections. 3.6.1 Master/Slave This application is used where the far end earth station does not have local access to a high stability reference clock, or when it is not required to synchronize with a local clock.
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SDM-650B Satellite Modem Configuration 3.6.1.1 Master/Slave RS-422 or V.35 Refer to Figure 3-16 for the RS-422 or V.35 master/slave configuration. Figure 3-16. RS-422 or V.35 Master Slave Configuration Notes: 1. The clock may be looped back by using JP10 on the interface board. 2. Refer to Tables 3-1 or 3-2 for more information. RS-422 Clock Loopback Join RT-A to TT-A Join pin 8 to pin 17 Join RT-B to TT-B Join pin 26 to pin 35 V.
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Configuration SDM-650B Satellite Modem 3.6.1.1.1 Modem Settings (Master) 1. TX-CLOCK: EXT. 2. Install JP10 and JP11 on buffer card (AS/3812). 3. Set S3 as required. Refer to Table 3-9. 3.6.1.1.2 Modem Settings (Slave) 1. TX-CLOCK: EXT. 2. Set S3 to minimum size, and install JP11 on buffer card (AS/3812). Refer to Table 3-9. 3–52 Rev.
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SDM-650B Satellite Modem Configuration 3.6.1.2 Master/Slave G.703 Refer to Figure 3-17 for the G.703 master/slave configuration. Note: There is no loop timing selection on board for G.703. It is assumed that any G.703 termination equipment will extract the clock from the satellite signal, and turn it around for re-transmitting. The settings for the master and slave modems are the same as listed in previous sections. Figure 3-17. G.703 Master Slave Configuration Rev.
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Configuration SDM-650B Satellite Modem 3.6.1.3 Master/Slave X.21 Refer to Figure 3-18 for the X.21 master/slave configuration. Figure 3-18. X.21 Master/Slave Configuration Note: On Rev. E boards, there are on-board jumpers to loop back the clock. Refer to Table 3-1 (see the note in the previous example). 3.6.1.3.1 Modem Settings (Master) • • • TX-CLOCK: INT. Install JP10 and JP11 on buffer card (AS/3812). Set S3 as required. Refer to Table 3-9. 3.6.1.3.
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SDM-650B Satellite Modem Configuration 3.6.1.4 Master/Slave External Station Clock Figure 3-19 shows the master/slave external station clock configuration diagram. Note: Clock must be looped externally at slave end. (For RS-422 and V.35, see the note in the previous example.) Figure 3-19. G.703 Master Slave Configuration 3.6.1.4.1 Modem Settings (Master) • • • TX-CLOCK: EXT. Install JP10 on buffer card (AS/3812), and set S3 as required. Refer to Table 3-9. 3.6.1.4.2 Modem Settings (Slave) • • Rev.
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Configuration SDM-650B Satellite Modem 3.6.2 Master/Master This application is used where both earth stations have high stability clocks available, and the received data is to be clocked onto the local network. The disadvantage of the master/master application is that the receive data will slip, as the clocks will not be synchronized. By using very high stability clocks, the expected time between slips can be many days.
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SDM-650B Satellite Modem Configuration 3.6.2.1.1 Modem Settings (Master) • • • Rev. 5 TX-CLOCK: EXT. Install JP10 and JP11 on buffer card (AS/3812). Set S3 as required. Refer to Table 3-9.
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Configuration SDM-650B Satellite Modem 3.6.2.2 Master/Master (Station Clock) Care should be taken when using this mode. Make sure that the station clock is also used to synchronize the transmit data. Phasing problems may also occur between the transmit data and the station clock input. For this reason, it is better to use the TERR clock on transmit. Refer to Figure 3-21 for a diagram of the master/master station clock configuration. Figure 3-21.
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SDM-650B Satellite Modem Configuration 3.6.2.2.1 Modem Settings (Master) • TX-CLOCK: EXT. • Install JP1 and JP10 on buffer card (AS/3812). • Set S3 as required: • Rev. 5 If using the G.703 2048 kbit/s interface (AS/0679), set SW1-6 and SW1-7 to open, and the remainder to closed. If using the T1/DS1 1544 kbit/s interface (AS/0569), set SW1-1 to closed for AMI line coding, and open for B8ZS line coding. SW1-2 through SW1-4 should be set as required.
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Configuration SDM-650B Satellite Modem This page is intentionally left blank. 3–60 Rev.
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Chapter 4. OPERATION This chapter provides front panel operation information for the standard SDM-650B modem. The following firmware version is described: • • Firmware number: Software version: FW/0713-35R 4.16 Notes: 1. For front panel operation information for the modem with the asynchronous overhead channel unit installed, refer to Appendix F. 2. For front panel and remote control operation information for the modem with the Trojan interface installed, refer to Appendix G. 3.
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Operation SDM-650B Satellite Modem 4.1 Front Panel The modem front panel (Figure 4-1) provides the local user interface, which is necessary to configure and monitor the modem status. Figure 4-1. SDM-650B Front Panel View The front panel features a 16-character, 2-line LCD display, and 6-key keypad that provides sophisticated functions, yet is easy to use. Eight LED indicators are also present on the front panel to provide overall status at a glance.
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SDM-650B Satellite Modem Operation 4.1.1 LED Indicators General modem status and summary fault information are indicated by eight LEDs on the front panel. The indicators are defined as follows: Faults Transmit Receive Common Stored Color Red LED Red LED Red LED Red LED Power On Transmitter On Green LED Green LED Carrier Detect Test Mode Green LED Yellow LED Description Indicates that a modulator fault condition exists. Indicates that a demodulator/decoder fault condition exists.
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Operation SDM-650B Satellite Modem The modem responds by beeping whenever a key is pressed. • A single beep indicates that the key pressed was a valid entry, and the appropriate action was taken. • A double beep when a key is pressed indicates an invalid entry. The modem front panel control uses a tree structured menu system (Tables 4-1 through 4-6) to access and execute all functions. The base level of this structure is the sign-on message, which is displayed at the front panel upon modem power-up.
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SDM-650B Satellite Modem Operation Table 4-2. Select Configuration Menu Menus Submenus/Options TX-x Code Rate x = A, B, C, D, or V RX-x Code Rate TX_Freq x = A, B, C, D, or V 50.0000 to 90.0000 MHz or 100.000 to 180.000 MHz 50.000 to 90.0000 MHz or 100.000 to 180.000 MHz ON OFF -5.
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Operation SDM-650B Satellite Modem Table 4-3. Select Monitor Menu Raw_BER Menus Submenus/Options Range: < 1.0E-4 to 2549E-4 Corr_BER Range: > 1E-8 to > 1E-3 Eb/N0 Range: < 3.2 dB to > 9.7 dB SWP_FREQ Range: -25000 to +25000 Hz RXSignal Range: < -60 dBm to > -30 dBm Comments Displays information when fast acquisition has been turned ON in the Utility menu. Note: Data is not available or displayed when the decoder loses lock. Table 4-4.
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SDM-650B Satellite Modem Operation Table 4-5. Select Stored Faults (StFaults) Menu Menus Mod_Flt0 through Mod_Flt9 MM/DD/YY HH/MM/SS Dmd_Flt0 through Dmd_Flt9 MM/DD/YY HH/MM/SS CEq_Flt0 through CEq_Flt9 MM/DD/YY HH/MM/SS CLEAR ?? StFaults Rev.
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Operation SDM-650B Satellite Modem Table 4-6. Select Utility Menu Menus Comments Seconds (SS) reset at [ENTER]. Date Submenus/Options SS HH:MM AM/PM MM/DD/YY LAMP TEST?? YES Press [ENTER] to illuminate all front panel LEDs for three seconds. Add xxxxyyyy Address = 0 to 255 xxxx = Parity Odd Even yyyy = 110 to 9600 Baud Rate +20 dBm to -20 dBm Time POW ADJ OP MODE FAST ACQ BERT_set BUF_CNTL FILTERS ADJUST 4–8 TX ONLY RX ONLY DUPLEX ON OFF 1E-3 1E-4 1E-5 1E-6 1E-7 1E-8 NONE ON OFF MOD ADJ.
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SDM-650B Satellite Modem Operation 4.1.4 Menu Explanations Modem configuration may be viewed or changed by entering the Config level from the Select menu on the front panel. 4.1.4.1 Select Configuration Refer to Table 4-2. Once the Config menu is entered, the configuration status of all parameters can be viewed by using [←] and [→]. To change a configuration parameter, press [ENTER] to begin the change process. Then, use the arrow keys to make the changes.
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Operation SDM-650B Satellite Modem TX_Freq Programs the modulator transmit frequency between 50 and 90 MHz, or between 100 and 180 MHz, in 2.5 kHz steps. On entry, the current transmitter frequency is displayed with the flashing cursor on the first character. Use [←] and [→] to move the flashing cursor. Use [↑] and [↓] to increment or decrement the digit at the flashing cursor. Press [ENTER] to execute the change.
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SDM-650B Satellite Modem Operation BBLoopBk Programs the modem for baseband loopback operation. (Test Mode Configuration Option) When baseband loopback is turned ON, the data and timing signals are hard-wired (relays) from the demodulator to the modulator. The DTE baseband signals are also looped back from transmitter data and clock, to receiver data and clock. Scramblr On entry, the current status of the baseband loopback is displayed with the flashing cursor on the first character.
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Operation SDM-650B Satellite Modem SWP_CNTR Note: This window is only displayed when Fast Acquisition has been turned ON in the Utility menu. Programs the sweep center frequency for the directed sweep function. The sweep center frequency may be set in the range from +25000 to -25000 Hz. On entry, the current programmed setting is displayed with a flashing cursor on the first character. Use [←] and [→] to move the flashing cursor.
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SDM-650B Satellite Modem CW_Mode (Test Mode Configuration Option) Operation Programs the modem for continuous wave mode. Three modes of operation are available: • • • Center Dual Offset Center Mode: Generates carrier at the current modulator frequency. This can be used to measure the output frequency. Dual Mode: Generates a dual side-band suppressed carrier signal. Side-bands are at one-half the symbol rate from the carrier. This is used to check the channel balance and carrier null.
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Operation SDM-650B Satellite Modem BUF_clk Programs the plesiochronous buffer output clock for: • • • • External Satellite Internal Ext_Ref External Mode: When this mode is selected and no clock is present at the rear of the modem, the clock will fallback to the satellite clock. The Satellite mode sets the output buffer clock to the satellite clock, which is also the fallback clock. Satellite Mode: When selected, the doppler shift caused by the satellite will not be removed.
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SDM-650B Satellite Modem Operation 4.1.4.2 Select Monitor Refer to Table 4-3. When the Monitor level is entered, use [←] and [→] to select the desired monitor function. Each monitor function is displayed in real time as long as it is selected. Function Raw_BER Cor_BER Eb/N0 Swp_Freq RXSignal Description Raw bit error rate. Range: < 1.0E-4 to 2550E-4 Corrected bit error rate. Range: < 1.0E-8 to > 1E-3 Energy(bit)/noise ratio. Range: < 3.2 to > 9.7 dB Sweep Monitor.
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Operation SDM-650B Satellite Modem 4.1.4.3 Select Faults Refer to Table 4-4. The Faults level is accessible from the Select menu. Faults are similar to monitor functions, they display the current fault status of the group being displayed. Use [←] and [→] to move between the fault groups: • • • Mod_Flts (modulator faults) Dmd_Flts (demodulator faults) Ceq_Flts (common equipment faults) The current fault status is displayed on line 2 of the display in real time.
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SDM-650B Satellite Modem Operation 4.1.4.3.1 Modulator Faults (Mod_Flts) RF_Syn Data Clk TClk Syn I-Channl Q-Channl AGC_levl Module Modulator RF synthesizer fault. Transmit data clock activity fault. Transmit clock synthesizer fault. I channel activity fault. Q channel activity fault. Automatic gain control level fault. Modulator module fault. Typically indicates that the modulator module is missing or will not program. Refer to Section 6.2 for option explanations. 4.1.4.3.
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Operation SDM-650B Satellite Modem 4.1.4.4 Select Stored Faults (StFaults) Refer to Table 4-5. The modem stores the first 10 (Flt0 to Flt9) occurrences of fault status changes in each of the three major fault categories. Each stored fault status change is also stored with the time and date of the occurrence. Stored faults may be viewed by entering the StFaults level from the Select menu. All stored faults may be cleared by executing the “CLEAR ?? StFaults” command from the StFaults level.
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SDM-650B Satellite Modem Operation 4.1.4.5 Select Utility Refer to Table 4-6. For additional information, refer to Section A.2.
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Operation SDM-650B Satellite Modem POW ADJ OP MODE Modulator power adjust offset. Allows the user to offset the modulator output power readout in the Config menu. This will be the highest modulator power that will be displayed and programmed. This feature does not actually change the modulator power level. The function is used to change the actual reading to display an offset value in the monitor. The modulator power offset can be set between +20.0 to -20.0 dBm, in 0.5 dBm increments. Operation Mode.
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SDM-650B Satellite Modem Assign TX_Fltrs Operation Modulator symbol rate assignment. This function is used to view current filter rate assignments, and to make filter rate re-assignments. The modulator has four symbol rate filters. Filters are designated as A, B, C, and D. Each filter is for a specific symbol rate. The data rate and code rate for each filter must be established upon initial modulator installation, and when circumstances indicate the need to do so.
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Operation SDM-650B Satellite Modem Assign RX_Fltrs Demodulator symbol rate assignment. This function is used to view current filter rate assignments, and to make filter rate re-assignments. The demodulator has four symbol rate filters. Filters are designated as A, B, C, and D. Each filter is for a specific symbol rate. The data rate and code rate for each filter must be established upon initial demodulator installation, and when circumstances indicate the need to do so.
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Chapter 5. THEORY OF OPERATION This chapter contains information on the following cards: • • • Modulator Sequential decoder/demodulator processor Demodulator In addition, information is provided on reacquisition, fast acquisition, and the directed sweep mode. 5.1 Modulator The modem modulator card is a 10.25” x 14” card that fits in the top-left slot of the modem chassis.
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Theory of Operation SDM-650B Satellite Modem A block diagram of the modulator is shown in Figure 5-1. INPUT DATA DATA SCRAMBLER DIFFERENTIAL ENCODER FORWARD ERROR CORRECTION ENCODER I CHANNEL NYQUIST FILTERS POWER COMBINER INPUT CLOCK CLOCK GENERATOR OUTPUT CLOCK CLOCK SYNTHESIZER Q CHANNEL NYQUIST FILTERS MULTIPLE LOOP SYNTHESIZER IF FILTER PROCESSOR BUS IF OUTPUT 50 to 90 MHz or 100 to 180 MHz BANDPASS FILTER MICRO-COMPUTER BUS INTERFACE OUTPUT LEVEL CONTROL Figure 5-1.
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SDM-650B Satellite Modem Theory of Operation 5.1.1 Specifications Modulation Type Frequency Range Frequency Select Method Frequency Step Size Frequency Stability Channel Spacing Phase Error Filtering Type Spectral Occupancy Spurious and Harmonics Output Power Level Range Output Power Adjustment Output Stability Output Impedance Output Return Loss Scrambling Differential Encoding FEC Encoding I/O Connector Rev. 6 QPSK (BPSK optional) 50 to 90 MHz, or 100 to 180 MHz Synthesized 2.5 kHz 10 PPM 0.
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Theory of Operation SDM-650B Satellite Modem Figure 5-2. Modulator Output Spectral Occupancy 5–4 Rev.
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SDM-650B Satellite Modem Theory of Operation 5.1.2 Theory of Operation Data that is to be transmitted is input to the digital interface of the modulator. The format is RS-422, and includes a clock synchronous with the data. The data at this point is clean and dejittered. A data rate clock provided by the clock synthesizer and buffered by the digital interface is output from the card. The frequency of this clock is programmable. The use of this clock as the source timing signal for the link is optional.
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Theory of Operation SDM-650B Satellite Modem For example, the rate of the encoder at 7/8 rate means 8 bits are output for every 7 bits input. If the modulator is in the QPSK mode, the data is split into two separate data streams to drive the in-phase and quadrature channels of the modulator. From the encoder, the data passes to the Nyquist filters. There are two identical Nyquist filters, one for the in-phase channel and one for the quadrature channel.
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SDM-650B Satellite Modem Theory of Operation 5.2 Sequential Decoder/Demodulator Processor The modem sequential decoder/demodulator processor is a 10.25” x 14” card that fits in the middle-left slot of the modem chassis.
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Theory of Operation SDM-650B Satellite Modem 5.2.1 Specification Demodulator Processor Operating Symbol Rate Range 32 Ks/s to 2048 Ks/s Operating Code Rate Range 7/8, 3/4, 1/2 Input Signal 11 Level Quantized I and Q Output Signals VCXO Drive, AGC Drive, I sign, I mag, Q sign, Q mag, Symbol, Clock, Data Clock Carrier Phase Error ± 3° max. Carrier Loop Bandwidth Software controlled Clock Phase Error ± 5% Clock Loop Bandwidth Software controlled Clock Jitter 5% P-P max.
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SDM-650B Satellite Modem Theory of Operation 5.2.2 Theory of Operation 5.2.2.1 Demodulator Processor The demodulator processor, in conjunction with the demodulator, reconstructs the digital data stream that was transmitted but corrupted by transmission channel impairments. The demodulator processor accepts 11-bit quantized signals from the demodulator for both the I and Q channels. Two of the levels are mainly used for clock recovery.
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Theory of Operation SDM-650B Satellite Modem 5.2.2.2 Sequential Decoder The sequential decoder works in conjunction with the convolutional encoder at the transmitting modem to correct bit errors in the received data stream from the demodulator. The sequential decoder processes 2-bit quantized, I and Q channel data symbols from the demodulator. This data is assumed to be a representation of the data transmitted, corrupted by additive white Gaussian noise.
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SDM-650B Satellite Modem Theory of Operation The input RAM buffers the data to provide history for the backwards searches. Data from the RAM passes through the ambiguity corrector, which compensates for the potential 90° phase ambiguity of the demodulator. The syndrome input generator converts the 2-bit soft decision data into a single bit per channel, and simultaneously corrects some isolated bit errors.
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Theory of Operation SDM-650B Satellite Modem 5.2.2.2.1 Sequential Decoder BER Performance Specifications The guaranteed BER performance curves for the sequential decoder are shown in Figures 1-4 through 1-6. The specifications are based on 1/2, 3/4, and 7/8 rates at 100 and 1544 kbit/s. The theoretical BER performance curves for the sequential decoder are shown in Figures 5-4 through 5-6. The specifications are based on 1/2, 3/4, and 7/8 rates at 56 and 1544 kbit/s. 5–12 Rev.
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SDM-650B Satellite Modem Theory of Operation 10-2 10-3 10-4 10-5 10-6 BER 10-7 10-8 56 kbit/s 10-9 1544 kbit/s THEORETICAL 10-10 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 Eb/N0 (dB) Figure 5-4. Sequential Decoder BER Performance Curves (1/2 Rate) Rev.
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Theory of Operation SDM-650B Satellite Modem 10-2 10-3 10-4 10-5 10-6 BER 10-7 56 kbit/s 10-8 1544 kbit/s THEORETICAL 10-9 10-10 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 Eb/N0 (dB) Figure 5-5. Sequential Decoder BER Performance Curves (3/4 Rate) 5–14 Rev.
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SDM-650B Satellite Modem Theory of Operation 10-2 10-3 10-4 10-5 10-6 1544 kbit/s BER 56 kbit/s 10-7 THEORETICAL 10-8 10-9 10-10 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 Eb/N0 (dB) Figure 5-6. Sequential Decoder BER Performance Curves (7/8 Rate) Rev.
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Theory of Operation SDM-650B Satellite Modem 5.3 Demodulator The modem demodulator card is a 10.25” x 14” card that fits in the lower-left slot of the modem chassis. The demodulator’s function is to accept a desired QPSK or BPSK modulated signal in the 50 to 90 MHz, or 100 to 180 MHz range. The card converts the signal to filtered baseband in-phase and quadrature signals, which are then quantized and output from the card.
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SDM-650B Satellite Modem Theory of Operation 5.3.1 Specifications Demodulation Type Frequency Range Frequency Select Method Frequency Step Size Channel Spacing Input Level Desired Carrier Input Overload Input Impedance Input Return Loss Filtering Image Rejection Symbol Rate Range I/O Connector QPSK (BPSK optional) 50 to 90 MHz, or 100 to 180 MHz Synthesized 2.5 kHz 0.
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Theory of Operation SDM-650B Satellite Modem 5.4 Reacquisition, Fast Acquisition, and Directed Sweep The fast acquisition algorithm has been permanently installed in the current version of the modem software. The carrier should be acquired within 30 seconds, regardless of the symbol rate. The upper limit on the symbol rate for fast acquisition is 128 kbit/s. There is no lower limit. Fast acquisition will work in conjunction with the sweep reacquisition function.
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SDM-650B Satellite Modem Theory of Operation The reacquisition mode is intended to reduce the time for reacquisition at lower symbol rates. The following guidelines should be applied when using the reacquisition mode: • The time specified for reacquisition must be multiples of 10% of the total nominal sweep time. This will ensure that the modem has time to sweep across the lock point at least once prior to termination of the reacquisition mode.
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Theory of Operation SDM-650B Satellite Modem 5.4.3 Directed Sweep The directed sweep mode was designed to rapidly acquire a carrier of known frequency offset. If the customer knows where the carrier is going to be, the directed sweep mode can be much faster than the fast acquisition mode. Due to the reduced speed of the lower data rates (up to 30 seconds in fast acquisition), the customer has the option of controlling the sweep functions.
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Chapter 6. MAINTENANCE This chapter provides information on the following: • • • • • System checkout Fault isolation Interface fault isolation Module replacement Module identification 6.1 System Checkout This section should be used as an aid in setting up a modem within an earth station. 6.1.1 Modulator The modem supplies a QPSK modulated result of the DATA I/O connector to the IF output connector (CP1). A typical output spectrum is shown in Figure 6-1.
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Maintenance SDM-650B Satellite Modem The first step in turning up a carrier is to set the output frequency. This is done in the Config menu on the front panel (refer to Chapter 4).
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SDM-650B Satellite Modem Maintenance Refer to Figure 6-3 for a typical eye pattern with noise, and Figure 6-4 for a typical eye pattern without noise. Refer to Figure 6-5 for a typical eye constellation with noise, and Figure 6-6 for a typical eye constellation without noise. If the demodulator does not lock up, refer to the fault isolation in Section 6.2.2 to help find the problem. Rev.
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Maintenance SDM-650B Satellite Modem Figure 6-1. Typical Output Spectrum Figure 6-2. Typical Output Spectrum 6–4 Rev.
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SDM-650B Satellite Modem Maintenance Table 6-1. EFData Conversion of (S+N)/N to S/N and Eb/N0 for Various Code Rates (dB) (S+N)/N 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5 17.0 17.5 18.0 18.5 19.0 19.5 20.0 Rev. 6 Code Rate 1/2 S/N Eb/N0 Code Rate 3/4 S/N Eb/N0 Code Rate 7/8 S/N Eb/N0 1.8 2.6 3.3 4.1 4.7 5.4 6.0 6.6 7.3 7.8 8.4 9.0 9.5 10.1 10.6 11.2 11.7 12.2 12.8 13.3 13.8 14.3 14.9 15.4 15.9 16.4 16.9 17.4 17.9 18.4 18.
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Maintenance SDM-650B Satellite Modem Figure 6-3. Typical Eye Pattern with Noise (Approximately 7.5 dB Eb/N0 ) Figure 6-4. Typical Eye Pattern without Noise 6–6 Rev.
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SDM-650B Satellite Modem Maintenance Figure 6-5. Typical Eye Constellation with Noise (Approximately 7.5 dB Eb/N0 ) Figure 6-6. Typical Eye Constellation without Noise Rev.
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Maintenance SDM-650B Satellite Modem 6.1.3 Test Points The following sections detail front panel test points, with a description of the signal that is to be present under normal operation. 6.1.3.1 Modulator Refer to Figure 6-7. TPG1 TP2 Ground. Q EYE Pattern. TP3 Level is 2 Vp-p. The DC offset is 0V. This signal is the Q input to the QPSK modulator. The eye pattern at this point is not equalized. I EYE Pattern. TP4 Level is 2 Vp-p. The DC offset is 0V.
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SDM-650B Satellite Modem Maintenance 6.1.3.2 Demodulator Refer to Figure 6-8. TP10 VCXO Control Voltage. TP23 Approximately 0 to +2.5V sweep range. Discriminator Voltage. TPG1 TP1 Nominally +2.5V with 6 dB noise at 128 kbit/s. Ground. Q EYE Pattern. TP2 TP3 TP4 Level is 1 Vp-p at the center of the eye crossing. The DC offset is about +2.4V. Q THRS — Q channel threshold voltage, +2.9 VDC. I THRS — I channel threshold voltage, +2.9 VDC. I EYE Pattern.
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Maintenance SDM-650B Satellite Modem 6.1.3.3 Sequential Decoder/Demod Card Refer to Figure 6-9. TPG1 TP8 Ground. VCXO Control Voltage. TP1 Sweeps from -2.5V to +2.5 VDC. IMAG — I Channel Magnitude Bit. TP2 Result of the soft bits from the soft decision interface. Transitions will occur in the presence of noise in the RF signal. QSGN — Q Channel Sign Bit. TP3 Result of the hard bits from the soft decision interface. 50% duty cycle random data is displayed. ISGN — I Channel Sign Bit.
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SDM-650B Satellite Modem Maintenance 6.2 Fault Isolation System faults are reported in the Faults menu. Stored faults are reported in the StFaults menu. Refer to Chapter 4 for more information. The following sections list the system faults outlined in Chapter 4. Use the following information to isolate a problem, and help in deciding the appropriate action to be taken. 6.2.1 Modulator Faults (Mod_Flts Menu) Fault RF_SYN DATA_CLK TCLK_SYN Possible Problem and Action Modulator synthesizer is faulted.
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Maintenance SDM-650B Satellite Modem I-CHANNL Q-CHANNL Activity alarm for the I channel digital filter. This alarm is considered a major alarm, and will turn OFF the modulator output. An alarm in this position indicates either a fault in the scrambler, or if the scrambler is disabled, it indicates a loss of incoming data. If the fault is active with the scrambler turned OFF, check to see that there is input data at the DATA I/O connector.
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SDM-650B Satellite Modem I-CHANNL Maintenance Indicates a loss of activity in the I channel of the quadrature demodulator. Typically indicates a problem in the modulator side of the circuit. Check for proper RF input to the demodulator. If the input to the demodulator is correct, then the problem is in the baseband filter on the daughter card on the demodulator, in the soft decision circuitry on the demodulator, or in the decoder Costas processor.
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Maintenance SDM-650B Satellite Modem 6.2.3 Common Equipment Faults (CEq_Flts Menu) Fault BATTERY Possible Problem and Action M&C battery voltage fault. -12 Volt Indicates a low voltage in the memory battery. Typically will be active when a modem is first turned ON. Allow the modem to charge up the battery before any other action is taken. Charge time is 5 to 8 hours, depending on how long the modem has been powered down. -12V power supply fault. +12 Volt Indicates a high or low voltage condition.
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SDM-650B Satellite Modem Maintenance 6.3 Interface Fault Isolation Stored faults for the interface are reported in the StFaults menu (refer to Chapter 4). The following sections list the interface faults. All other faults are discussed in Section 6.2. 6.3.1 Transmit Faults (TX_INTF) The faults listed below are only displayed when the ASYNC overhead channel unit is installed.
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Maintenance SDM-650B Satellite Modem 6.3.2 Receive Faults (RX_INTF) The faults listed below are only displayed when the ASYNC overhead channel unit is installed. Fault BUF_UNFL Possible Problem and Action Buffer Underflow. The plesiochronous buffer has underflowed. BUF_OVFL As buffer underflow is normally a momentary fault (there are clock problems if this is continuously present).
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SDM-650B Satellite Modem Maintenance Table 6-2. Programmable Data Rates for the Variable Rate SDM-650B Modem 20.4 22.0 23.6 25.4 26.8 27.8 28.8 29.8 30.8 31.8 32.8 33.8 34.8 35.8 36.8 37.8 38.8 39.8 40.8 41.8 42.8 43.8 44.8 45.8 46.8 47.8 48.8 49.8 50.8 54.5 59.5 64.5 69.5 74.5 79.5 84.5 89.5 94.5 99.5 104.5 109.5 114.5 119.5 124.5 129.5 134.5 139.5 144.5 149.5 154.5 159.5 164.5 169.5 174.5 179.5 184.5 189.5 194.5 199.5 Rev. 6 20.5 22.2 23.8 25.5 26.9 27.9 28.9 29.9 30.9 31.9 32.9 33.9 34.9 35.9 36.
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Maintenance 204.5 208.5 212.5 216.5 220.5 224.5 228.5 232.5 236.5 240.5 244.5 248.5 252.5 257.0 263.0 270.0 276.8 283.2 290.0 297.0 303.0 310.0 316.8 323.2 330.0 337.0 343.0 350.0 356.8 363.2 370.0 377.0 383.0 390.0 396.8 403.2 410.0 417.0 423.0 430.0 436.8 443.2 450.0 457.0 463.0 470.0 476.8 483.2 490.0 497.0 503.0 510.0 518.4 529.6 539.2 548.8 558.4 569.6 579.2 588.8 598.4 6–18 SDM-650B Satellite Modem 204.8 209.0 212.8 217.0 220.8 225.0 228.8 233.0 236.8 241.0 244.8 249.0 252.8 257.6 264.0 270.4 277.
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SDM-650B Satellite Modem 609.6 619.2 628.8 638.4 649.6 659.2 668.8 678.4 689.6 699.2 708.8 718.4 729.6 739.2 748.8 758.4 769.6 779.2 788.8 798.4 809.6 820.0 840.0 860.0 880.0 900.0 920.0 940.0 960.0 980.0 1000.0 1020.0 1056.0 1096.0 1136.0 1176.0 1216.0 1256.0 1296.0 1336.0 1376.0 1416.0 1456.0 1496.0 1536.0 1576.0 1616.0 1656.0 1696.0 1736.0 1776.0 1816.0 1856.0 1896.0 1936.0 1976.0 2016.0 2064.0 2144.0 2224.0 2304.0 Rev. 6 610.0 620.0 630.0 640.0 650.0 660.0 670.0 680.0 690.0 700.0 710.0 720.0 730.
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Maintenance 2384.0 2464.0 2544.0 2624.0 2704.0 2784.0 2864.0 2944.0 3024.0 3104.0 3184.0 3264.0 3344.0 3424.0 3504.0 3584.0 Notes: 1. 2. 3. 4. 5. SDM-650B Satellite Modem 2392.0 2472.0 2552.0 2632.0 2712.0 2792.0 2872.0 2952.0 3032.0 3112.0 3192.0 3272.0 3352.0 3432.0 3512.0 2400.0 2480.0 2560.0 2640.0 2720.0 2800.0 2880.0 2960.0 3040.0 3120.0 3200.0 3280.0 3360.0 3440.0 3520.0 2408.0 2488.0 2568.0 2648.0 2728.0 2808.0 2888.0 2968.0 3048.0 3128.0 3208.0 3288.0 3368.0 3448.0 3528.0 2416.0 2496.0 2576.
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SDM-650B Satellite Modem Maintenance 6.4 Module Replacement The modem cards are plug-in cards that can be replaced by removing the defective card, and reinserting the replacement. Card ejectors are available for use in removing the cards. Note: On the interface card, there are additional screws on the rear panel that need to be removed before the interface card is removed. These screws must be reinstalled after the replacement card is inserted.
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Maintenance SDM-650B Satellite Modem Table 6-3.
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Appendix A. DATA RATES AND FILTERS The modem will operate at data rates from 19.2 kbit/s to 3.584 Mbit/s. Data rates from 19.2 to 48 kbit/s are 1/2 rate BPSK only. Variable rate filters can operate from 19.2 to 2048 kbit/s. Fixed rate filters allow operation from 19.2 to 3584 kbit/s. This appendix covers: • • • Data rate change instructions for fixed rate and variable rate filters Differences between a fixed rate filter and a variable rate filter Modem configuration for each filter type A.
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Data Rates and Filters SDM-650B Satellite Modem VARIABLE RATE MODULATOR FILTER MOUNTING HARDWARE (2) FIXED RATE MODULATOR FILTER MODULATOR Figure A-1. Modulator Filter Card Change 5. Install the replacement daughter card, and ensure both screw holes line up with the mounting hardware. See Figure A-1. If the filter is installed in the wrong position, the daughter card will be damaged. CAUTION A–2 Rev.
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SDM-650B Satellite Modem Data Rates and Filters 6. Re-install the daughter board hold-down screws (Figure A-1). Re-insert the modulator into the chassis. 7. Remove the demodulator card (AS/0778) using the white card ejectors. 8. With a Phillips screwdriver, remove the four screws holding down the daughter card. See Figure A-2 for location of the hardware. 9. Remove the daughter card (AS/0362) from the demodulator. 10. Install the replacement daughter card (AS/0362) so that: a.
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Data Rates and Filters SDM-650B Satellite Modem DEMODULATOR ASSEMBLY AND REVISION NUMBER DATA RATE INFORMATION SERIAL NUMBER VARIABLE RATE DEMODULATOR FILTER FIXED RATE DEMODULATOR FILTER Figure A-2. Demodulator Filter Card Change A–4 Rev.
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SDM-650B Satellite Modem Data Rates and Filters A.1.2 Hardware Configuration This section lists the hardware configuration of a standard modem with a fixed rate filter installed. Hardware Requirements Description Modem Chassis X = 1 — SDM-650B Chassis AS/0356 Rev. F or higher Monitor and Control M&C Software Requirements SDM-650B Ver. 2.
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Data Rates and Filters SDM-650B Satellite Modem A.2 Variable Rate Filters A.2.1 Data Rate Change Instructions 1. Turn OFF modem power switch. 2. Remove the modulator card (AS/0773) using the black card ejectors. Verify the daughter card is a variable rate filter (AS/0930). If not, refer to Section A.1. 3. Re-install the modulator card into the modem chassis. 4. Remove the demodulator card (AS/0778) using white card ejectors. Verify the daughter card is a variable rate filter (AS/0929).
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SDM-650B Satellite Modem Data Rates and Filters A.2.2 Hardware Configuration This section lists the differences between a standard modem and a modem with the variable rate filter installed. A variable rate modem is end-to-end compatible with a non-variable rate modem of the same model number. In most cases, the modem can be used as a prime or backup modem in the same protection switch with a non-variable rate modem.
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Data Rates and Filters SDM-650B Satellite Modem The following functions are found in the Select Config menu. Refer to Chapter 4 for more information. TXR Transmitter Rate. On entry, the current transmitter rate is displayed with the flashing cursor on the first character of the coding type on line 1, and the data rate on line 2. Use the arrow keys to select one of four pre-defined rates or variable. Press [ENTER] when TXV is displayed to change the rate using the variable rate selection.
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SDM-650B Satellite Modem Data Rates and Filters A.2.3 Utility The following functions are found in the Utility menu. Refer to Chapter 4 for the functions not mentioned below. FILTERS ADJUST Variable Rate Filters K Factor Settings. These are factory set parameters. The operator is not allowed to view or change these parameters without authorization from an EFData Customer Support Department representative. CAUTION ASSIGN TX_FLTRS Do not try to enter this mode.
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Data Rates and Filters SDM-650B Satellite Modem ASSIGN RX_FLTRS Demodulator Symbol Rate Assignment. The demodulator has four symbol rate filter assignments. Each filter is for a specific symbol rate. The data rate and coder rate for each filter is established upon initial modulator installation and when circumstances indicate the need to do so. Filters are designated as A, B, C, and D.
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Appendix B. REMOTE CONTROL OPERATION This appendix describes the remote control operation of the SDM-650B: • Section B.1 describes the standard version. • Section B.2 describes the modem with the asynchronous overhead channel unit option installed. Note: For remote control operation information on the modem with the Trojan interface option installed, refer to Appendix G. B.1 Standard Version This section describes the remote control operation of the standard SDM-650B: • • Rev.
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Remote Control Operation SDM-650B Satellite Modem B.1.1 General Remote controls and status information are transferred via an RS-485 (optional RS-232-C) serial communications link. Commands and data are transferred on the remote control communications link as US ASCII-encoded character strings. The remote communications link is operated in a half-duplex mode. Communications on the remote link are initiated by a remote controller or terminal.
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SDM-650B Satellite Modem Remote Control Operation B.1.2.2 Device Address The device address is the address of the one satellite modem which is designated to receive a transmitted command, or which is responding to a command. Valid device addresses are 1 to 3 characters long, and in the range of 1 to 255. Address 0 is reserved as a global address which simultaneously addresses all devices on a given communications link. Devices do not acknowledge global commands.
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Remote Control Operation SDM-650B Satellite Modem B.1.2.3 Command/Response The command/response portion of the message contains a variable length character sequence which conveys command and response data. If a satellite modem receives a message addressed to it which does not match the established protocol or cannot be implemented, a negative acknowledgment message is sent in response. This message is: • >add/?ER1_PARITY ERROR”cr””lf”] (Error message for received parity errors.
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SDM-650B Satellite Modem Remote Control Operation B.1.3 Configuration Commands/Responses B.1.3.1 Remote This command configures the modem for remote operation. The modem will respond to any status request at any time. However, the modem must be in “Remote Mode” to change configuration parameters. Command: Response: add/REM_”cr””lf”] B.1.3.2 Set Modulator Frequency Command: Response: add/MF_nnn.
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Remote Control Operation SDM-650B Satellite Modem B.1.3.5 Set Modulator Power Offset Command: Response: add/MPO_snn.n”cr””lf”] Status Only: Response: add/MPO_snn.n”cr””lf”] Where: snn.n = +20.0 to -20.0, in 0.5 dB increments. Notes: 1. This will be the highest modulator power that will be displayed and programmed. 2. Use the MOP_ command to actually change the modulator output power. B.1.3.6 Set Modulator Output Power Level Command: Response:
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SDM-650B Satellite Modem Remote Control Operation B.1.3.7 Modulator Rate The modulator has four symbol rate filters. Each filter is for a specific symbol rate. The data rate and coder rate for each filter must be established upon initial modulator installation, and when circumstances indicate the need to do so. Filters are designated as A, B, C, and D. If a filter is not physically present in the system, it may be assigned “N/A” (not assigned).
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Remote Control Operation SDM-650B Satellite Modem B.1.3.7.2 Select Modulator Rate Command: Response: add/SMRx_”cr” RF_OFF”cr””lf”] Status Only: (See MR command.) Where: x = A, B, C, or D (Filter designator). Notes: 1. Setting the modulator turns OFF the RF transmitter. 2. If the modem is commanded to a filter (rate) which is not assigned (N/A), the “error 2” message will be returned. B.1.3.7.
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SDM-650B Satellite Modem Remote Control Operation B.1.3.8 Demodulator Rate The demodulator has four symbol rate filters. Each filter is for a specific symbol rate. The data rate and decoder rate for each filter must be established upon initial demodulator installation, and when circumstances indicate the need to do so. Filters are designated as A, B, C, and D. If a filter is not physically present in the system, it may be assigned “N/A” (not assigned).
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Remote Control Operation SDM-650B Satellite Modem B.1.3.8.2 Select Demodulator Rate Command: Response: add/SDRx_”cr””lf”] Status Only: (See DR command.) Where: x = A, B, C, or D (Filter designator). Note: If the modem is commanded to a filter (rate) which is not assigned (N/A), the “error 2” message will be returned. B.1.3.8.3 Select Demodulator Rate Variable Note: This command is only applicable for the variable rate option. Command: Response:
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SDM-650B Satellite Modem Remote Control Operation B.1.3.11 Differential Encoder Enable Command: Response: add/DENC_xxx”cr”lf”] Status Only: Response: add/DENC_xxx”cr”lf”] Where: xxx = ON or OFF. B.1.3.12 Transmit Clock Command: Response: add/TC_xxx”cr””lf”] Status Only: Response: add/TC_xxx”cr””lf”] Where: xxx = INT or EXT. B.1.3.
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Remote Control Operation SDM-650B Satellite Modem B.1.3.15 RF Loopback Command: Response: add/RFL_xxx”cr””lf”] Status Only: Response: add/RFL_xxx”cr””lf”] Where: xxx = ON or OFF. B.1.3.16 IF Loopback Command: Response: add/IFL_xxx”cr””lf”] Status Only: Response: add/IFL_xxx”cr””lf”] Where: xxx = ON or OFF. B.1.3.
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SDM-650B Satellite Modem Remote Control Operation B.1.3.18 Date Command: Response: add/DATE_mm/dd/yy”cr””lf”] Status Only: Response: add/DATE_mm/dd/yy”cr””lf”] Where: mm = month. dd = day. yy = year. Example: Set modem 235 date to 11/30/87. Command: Response: <235/DATE_11/30/87”cr” >235/DATE_11/30/87”cr””lf”] B.1.3.19 Clear Stored Faults This command is used to clear all stored faults logged by the modem.
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Remote Control Operation SDM-650B Satellite Modem B.1.3.21 Sweep Reacquisition This command is used to specify time duration of the reacquisition mode. The sweep is reduced to ± 2500 Hz of the last known lock point. Use of this function may reduce reacquisition times at low data rates. To inhibit the sweep reacquisition mode, set “SR” to 0 seconds. Command: Response: add/SR_xxx”cr””lf”] Status Only: Response: add/SR_xxx”cr””lf”] Where: xxx = 0 to 999 (number of seconds).
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SDM-650B Satellite Modem Remote Control Operation B.1.3.22.1 Sweep Center Frequency This command sets the sweep center frequency. During carrier acquisition, the sweep starts at an offset, which is one-half the currently programmed sweep range (SWR_) from the sweep center frequency. The direction of the offset is determined by the currently programmed sweep direction (SD_). The sweep center frequency may be set in the range of +25000 to -25000 Hz.
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Remote Control Operation SDM-650B Satellite Modem B.1.3.22.3 Sweep Direction This command sets the direction of the sweep travel. “+” sets incremental sweep, while “-” sets decremental sweep. Command: Response: add/SD_s”cr””lf”] Status Only: Response: add/SD_s”cr””lf”] Where: s = + or - (direction of sweep travel during acquisition). Note: This command is only valid when fast acquisition is enabled. See the “FAM_” command definition. B.1.3.
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SDM-650B Satellite Modem Remote Control Operation B.1.3.24.1 Buffer Clock Command: Response: add/BC_xxx”cr””lf”] Status Only: Response: add/BC_xxx”cr””lf”] Where: xxx = TXC, RXC, or EXT. Note: This command is only valid when Buffer Control is enabled. See the “BUFF_” command definition. B.1.3.24.2 Interface Buffer Center This command centers the Doppler buffer.
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Remote Control Operation SDM-650B Satellite Modem B.1.4. Status Commands/Responses B.1.4.1 Configuration B.1.4.1.1 Modulator/Coder Status The Modulator/Coder configuration status command causes a block of data to be returned by the addressed modem. The block of data reflects the current configuration status of the Modulator/Coder. Command: Response: add/MCS_”cr” RF_xxx”cr” MF_nnn.nnnn”cr” MPO_snn.n”cr” MOP_snn.n”cr” MR_nnn_mmmm.m”cr” AMRA_nnn_mmmm.m”cr” AMRB_nnn_mmmm.m”cr” AMRC_nnn_mmmm.
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SDM-650B Satellite Modem Remote Control Operation B.1.4.1.3 Demodulator/Decoder Configuration Status The Demodulator/Decoder configuration status command causes a block of data to be returned by the addressed modem. The block of data reflects the current configuration of the demod. Command: Response: (See Note 1) (See Note 1) (See Note 1) (See Note 2) (See Note 2) add/DCS_”cr” DF_nnn.nnnn”cr” DR_nnn_mmmm.m”cr” ADRA_nnn_mmmm.m”cr” ADRB_nnn_mmmm.m”cr” ADRC_nnn_mmmm.m”cr” ADRD_nnn_mmmm.
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Remote Control Operation SDM-650B Satellite Modem B.1.4.1.4 Demodulator/Decoder Configuration Program This command is used by the SMS-658 M:N protection switch to collect information that is necessary to configure backup modems. Command: Response: (See Note 1) (See Note 1) (See Note 1) (See Note 2) (See Note 2) add/DCP_”cr” BBL_xxx”cr” IFL_xxx”cr” RFL_xxx”cr” DF_nnn.nnnn”cr” DR_nnn_mmmm.
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SDM-650B Satellite Modem Remote Control Operation B.1.4.3 Modulator Status The modulator status is returned as a block of data which indicates general status information.
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Remote Control Operation SDM-650B Satellite Modem B.1.4.5 Common Equipment Status The common equipment status command causes a block of data to be returned, which indicates the status of the common equipment. Command: Response: add/CES_”cr” M&C_xxx”cr” INT_xxx”cr” TXC_xxx”cr” BAT_xxx”cr” PS1_xxx”cr” PS2_xxx”cr” PS3_xxx”cr” MODE_xxxxxx”cr” SW_x.
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SDM-650B Satellite Modem Remote Control Operation B.1.4.7 BER Status B.1.4.7.1 Raw BER Command: Response: add/RBER_nnnnE-4”cr””lf”] Where: nnnn = RBER or < 1.0 (lower limit). Example: Request raw BER from modem 123. Command: Response: <123/RBER_”cr” >123/RBER_152E-4”cr””lf”] Where: RBER = .0152 errors/bit. Note: “No Data” is returned if no carrier is detected (decoder not locked). B.1.4.7.
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Remote Control Operation SDM-650B Satellite Modem B.1.4.8 Eb/N0 Status The Eb/N0 status command causes the Eb/N0 ratio to be returned. Eb/N0 is returned in dB. Command: Response: add/EBN0_n.ndB”cr””lf”] Example: Request Eb/N0 ratio from modem 2. Command: Response: <2/EBN0_”cr” >2/EBN0_6.2dB”cr””lf”] Where: Eb/N0 = 6.2 dB. Notes: 1. Eb/N0 limits are lower < 3 2 dB, upper > 9.7 dB. 2. “No Data” is returned if no carrier is detected (decoder not locked). B.1.4.
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SDM-650B Satellite Modem Remote Control Operation B.1.4.11 Receive Signal Level Status Command: Response: add/RSL_-nn.ndBm”cr””lf”] B.1.4.12 Current Sweep Value This command returns the current sweep value and the decoder lock status. Command: Response: add/CSV_snnnnn”cr” CD_xxx”cr””lf”] Where: s = + or - (sweep offset direction). nnnnn = 0 to 25000. xxx = OK or FLT (decoder lock status OK or FAULT). Rev.
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Remote Control Operation SDM-650B Satellite Modem B.1.4.13 Stored Faults Information on stored faults is returned when requested. If no stored fault exists for a given fault number, the words “NO FAULT” will be returned instead of the normal time/date status information. The following symbols are commonly used to define the stored faults status commands: • • • • • • • “#” hh mm ss MM DD YY Fault number (0 to 9), “0” is the first fault stored. Hours in 24-hr. format. Minutes. Seconds. Month. Day. Year.
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SDM-650B Satellite Modem Remote Control Operation B.1.4.13.3 Common Equipment Stored Faults Command: Response: add/CSF_# hh:mm:ss M&C_xxx”cr” INT_xxx”cr” TXC_xxx”cr” BAT_xxx”cr” PS1_xxx”cr” PS2_xxx”cr” PS3_xxx”cr””lf”] MM/DD/YY”cr” Monitor and Control Module (OK/FLT) Data Interface Module (OK/FLT) Transmit Clock Loss (DS1 only) Battery (OK/FLT) +5V Power Supply (OK/FLT) +12V Power Supply (OK/FLT) -12V Power Supply (OK/FLT) B.1.4.13.
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Remote Control Operation SDM-650B Satellite Modem B.1.4.14 Bulk Consolidated Status This command causes bulk modem status to be returned. To reduce the length of the response, message parameter data are returned without identifiers. However, parameter identification can be determined by order of return. Each status parameter is terminated with a “,” (comma), except for the last parameter, which has the standard message termination sequence (”cr””lf”]).
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SDM-650B Satellite Modem (See Note 1) (See Note 1) (See Note 1) (See Note 2) (See Note 2) Remote Control Operation Parameter 14 (p14): Demodulator rate currently programmed. p14 = nnn_mmmm.m, where “nnn” is the code rate, and “mmmm.m” is the data rate in kbit/s. Parameter 15 (p15): Demodulator filter A assignment. p15 = nnn_mmmm.m, where “nnn” is the code rate, and “mmmm.m” is the data rate in kbit/s. Parameter 16 (p16): Demodulator filter B assignment. p16 = nnn_mmmm.
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Remote Control Operation SDM-650B Satellite Modem B.1.4.15 Bulk Consolidated Analog Status This command is similar to the “BCS_” command, but returns modem analog parameters. Command: Response: add/BCAS_p1,p2,p3, . . . pn”cr””lf”] Where “pn” is the last parameter returned. Parameter 1 (p1): Receive signal level. p1 = -nn, where “nn” is the value of the receive signal level in dBm. Parameter 2 (p2): Raw BER. p2 = nnnnE-4, where “nnnn” is the raw bit errors in 10000 bits.
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SDM-650B Satellite Modem Remote Control Operation Where: Character “c”: Demodulator fault status character 1. Bit 6 = 1 always. Bit 5 = Demodulator fault. Bit 4 = Carrier detect status (0 for decoder lock). Bit 3 through Bit 0 = Binary representation (0 to 10) of the number of demodulator stored faults. Where: Character “d”: Demodulator fault status character 2. Bit 6 = 1 always. Bit 5 = Demodulator RF synthesizer fault. Bit 4 = Descrambler fault. Bit 3 = I channel fault. Bit 2 = Q channel fault.
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Remote Control Operation SDM-650B Satellite Modem B.1.4.18 Equipment Type This command returns the equipment model number and M&C firmware version number. Command: Response: add/ET_SDM650_x.xxx”cr””lf”] Where: x.xxx = M&C firmware version. B–32 Rev.
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SDM-650B Satellite Modem Remote Control Operation B.2 Asynchronous Overhead Interface Support Option This section describes the remote control operation of the SDM-650B with the asynchronous overhead channel unit option installed: • • Firmware number: Software version: FW/0713-34L 4.12A B.2.1 General Remote controls and status information are transferred via an RS-485 (optional RS-232-C) serial communications link.
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Remote Control Operation SDM-650B Satellite Modem B.2.2.1 Start Character A single character precedes all messages transmitted on the remote link. This character flags the start of a message. This character is: • • “<” for commands “>” for responses B.2.2.2 Device Address The device address is the address of the one satellite modem which is designated to receive a transmitted command, or which is responding to a command. Valid device addresses are 1 to 3 characters long, and in the range of 1 to 255.
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SDM-650B Satellite Modem Remote Control Operation B.2.2.3 Command/Response The command/response portion of the message contains a variable length character sequence which conveys command and response data. If a satellite modem receives a message addressed to it which does not match the established protocol or can not be implemented, a negative acknowledgment message is sent in response. This message is: • >add/?ER1_PARITY ERROR”cr””lf”] (Error message for parity errors.
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Remote Control Operation SDM-650B Satellite Modem B.2.3 Modulator Configuration Commands B.2.3.1 Set Modulator Frequency Command: Response: add/MF_nnn.nnnn”cr” RF_OFF”cr””lf”] Status Only: Response: add/MF_nnn.nnnn”cr””lf”] Where: nnn.nnnn = 50.0000 to 90.0000, and 100.0000 to 180.0000 for the 140 MHz modulator. Note: When modulator frequency is changed, the RF output is switched OFF. B.2.3.
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SDM-650B Satellite Modem Remote Control Operation B.2.3.4 Set Modulator Output Power Level Command: Response: add/MOP_snn.n”cr””lf”] Status Only: Response: add/MOP_snn.n”cr””lf”] Where: snn.n = +20.0 to -45.0, in 0.5 dB increments for 140 MHz modulator. snn.n = +20.0 to -30.0, in 0.5 dB increments for 70 MHz modulator. Notes: 1. Must be within 25.0 dB of the modulator power offset value (see MPO_) for the 140 MHz modulator, and within 10.
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Remote Control Operation SDM-650B Satellite Modem B.2.3.5 Modulator Rate The modulator has four symbol rate filters. Each filter is for a specific symbol rate. The data rate and coder rate for each filter must be established upon initial modulator installation, and when circumstances indicate the need to do so. Filters are designated as A, B, C, and D. If a filter is not physically present in the system, it may be assigned “N/A” (not assigned).
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SDM-650B Satellite Modem Remote Control Operation B.2.3.5.2 Select Modulator Rate Command: Response: add/SMRx_”cr” RF_OFF”cr””lf”] Status Only: (See MR command.) Where: x = A, B, C, or D (Filter designator). Notes: 1. Setting the modulator turns OFF the RF transmitter. 2. If the modem is commanded to a filter (rate) which is not assigned (N/A), the “error 2” message will be returned. B.2.3.5.
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Remote Control Operation SDM-650B Satellite Modem B.2.3.7 Differential Encoder Enable Command: Response: add/DENC_xxx”cr”lf”] Status Only: Response: add/DENC_xxx”cr”lf”] Where: xxx = ON or OFF. B.2.4 Demodulator Configuration Commands B.2.4.1 Set Demodulator Frequency Command: Response: add/DF_nnn.nnnn”cr””lf”] Status Only: Response: add/DF_nnn.nnnn”cr””lf”] Note: nnn.nnnn = 50.0000 to 90.0000, and 100.0000 to 180.
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SDM-650B Satellite Modem Remote Control Operation B.2.4.2.1 Demodulator Filter Rate Assignment Command: Response: add/ADRx_nnn_mmmm.m”cr””lf”] Status Only: Response: add/ADRx_nnn_mmmm.m”cr””lf”] Where: x = A, B, C, or D (Filter designator). nnn = 1/2, 3/4, 7/8, or BP12 (Decoder rate). mmmm.m = 9.6 to 4080.0 (Data rate). Note: The parameters “nnn_mmmm.m” may be replaced by “N/A” to indicate “no assignment.
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Remote Control Operation SDM-650B Satellite Modem B.2.4.3 Descramble Enable Command: Response: add/DE_xxx”cr””lf”] Status Only: Response: add/DE_xxx”cr””lf”] Where: xxx = ON or OFF. B.2.4.4 RF Loopback Command: Response: add/RFL_xxx”cr””lf”] Status Only: Response: add/RFL_xxx”cr””lf”] Where: xxx = ON or OFF. B.2.4.
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SDM-650B Satellite Modem Remote Control Operation B.2.4.7 Sweep Reacquisition This command is used to specify time duration of the reacquisition mode. The sweep is reduced to ± 2500 Hz of the last known lock point. Use of this function may reduce reacquisition times at low data rates. To inhibit the sweep reacquisition mode, set “SR” to 0 seconds. Command: Response: add/SR_xxx”cr””lf”] Status Only: Response: add/SR_xxx”cr””lf”] Where: xxx = 0 to 999 (number of seconds).
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Remote Control Operation SDM-650B Satellite Modem B.2.4.8.1 Sweep Center Frequency This command sets the sweep center frequency. During carrier acquisition, the sweep starts at an offset which is one-half the currently programmed sweep range (SWR_) from the sweep center frequency. The direction of the offset is determined by the currently programmed sweep direction (SD_). The sweep center frequency may be set in the range of +25000 to -25000 Hz.
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SDM-650B Satellite Modem Remote Control Operation B.2.4.8.3 Sweep Direction This command sets the direction of the sweep travel. “+” sets incremental sweep, while “-” sets decremental sweep. Command: Response: add/SD_s”cr””lf”] Status Only: Response: add/SD_s”cr””lf”] Where: s = + or - (direction of sweep travel during acquisition). Note: This command is only valid when fast acquisition is enabled. See the “FAM_” command definition. B.2.
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Remote Control Operation SDM-650B Satellite Modem B.2.5.3 Receive Clock Command: Response: add/RC_xxx”cr””lf”] Status Only: Response: add/RC_xxx”cr””lf”] Where: xxx = NRM or INV. B.2.5.4 External Reference Frequency Command: Response: add/ERF_nnnnn”cr””lf”] Status Only: Response: add/ERF_nnnnn”cr””lf”] Where: nnnnn = 8 to 99992 (external reference frequency in kHz, must be a multiple of 8 kHz).
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SDM-650B Satellite Modem Remote Control Operation B.2.5.7 Interface Coding Format Transmit Command: Response: add/ICFT_xxxx”cr””lf”] Status Only: Response: add/ICFT_xxxx”cr””lf”] Where: xxxx = AMI, HDB3, B6ZS, or B8ZS. B.2.5.8 Interface Coding Format Receive Command: Response: add/ICFR_xxxx”cr””lf”] Status Only: Response: add/ICFR_xxxx”cr””lf”] Where: xxxx = AMI, HDB3, B6ZS, or B8ZS. B.2.5.
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Remote Control Operation SDM-650B Satellite Modem B.2.5.11 Transmit Overhead Baud Rate Command: Response: add/TOBR_nnnnn”cr””lf”] Status Only: Response: add/TOBR_nnnnn”cr””lf”] Where: nnnnn = 110, 150, 300, 600, 1200, 2400, 4800, 9600, 19200, or 38400. B.2.5.
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SDM-650B Satellite Modem Remote Control Operation B.2.5.15 Overhead Channels Parity Command: Response: add/OCP_xxxx”cr””lf”] Status Only: Response: add/OCP_xxxx”cr””lf”] Where: xxxx = ODD, EVEN, or NONE. B.2.5.16 Interface Substitution Pattern (Transmit 2047 Pattern) Command: Response: add/ISP_xxx”cr””lf”] Status Only: Response: add/ISP_xxx”cr””lf”] Where: xxx = ON or OFF (transmit 2047 pattern generation). B.2.
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Remote Control Operation SDM-650B Satellite Modem B.2.6.2 Date Command: Response: add/DATE_mm/dd/yy”cr””lf”] Status Only: Response: add/DATE_mm/dd/yy”cr””lf”] Where: mm = month. dd = day. yy = year. Example: Set modem 235 date to 11/30/87. Command: Response: <235/DATE_11/30/87”cr” >235/DATE_11/30/87”cr””lf”] B.2.6.3 Remote This command configures the modem for remote operation. The modem will respond to any status request at any time.
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SDM-650B Satellite Modem Remote Control Operation B.2.6.5 Modem Operation Mode This command configures the modem for simplex or duplex operation modes. When transmit-only mode is selected, receive faults are inhibited. When receive-only mode is selected, transmit faults are inhibited. Command: Response: add/MOM_xxxxxxx”cr””lf”] Status Only: Response: add/MOM_xxxxxxx”cr””lf”] Where: xxxxxxx = TX_ONLY, RX_ONLY, or DUPLEX. B.2.
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Remote Control Operation SDM-650B Satellite Modem B.2.7.1.3 Maximum AUPC Power Limit Command: Response: add/MAXP_-nn.n”cr””lf”] Status Only: Response: add/MAXP_-nn.n”cr””lf”] Where: nn.n = 5.0 to 30.0, in 0.5 increments (power in dBm). B.2.7.1.4 Minimum AUPC Power Limit Command: Response: add/MINP_-nn.n”cr””lf”] Status Only: Response: add/MINP_-nn.n”cr””lf”] Where: nn.n = 5.0 to 30.0, in 0.5 increments (power in dBm). B.2.7.
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SDM-650B Satellite Modem Remote Control Operation B.2.7.1.7 AUPC Local Carrier Loss Action Command: Response: add/LCL_xxxx”cr””lf”] Status Only: Response: add/LCL_xxxx”cr””lf”] Where: xxxx = HOLD, NOM, or MAX (power level setting when local carrier loss). B.2.7.1.
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Remote Control Operation SDM-650B Satellite Modem B.2.7.2.2 Remote Interface Substitution Pattern (Transmit 2047 Pattern) Command: Response: add/RISP_xxx”cr””lf”] Status Only: Response: add/RISP_xxx”cr””lf”] Where: xxx = ON or OFF (remote transmit 2047 pattern enable). B.2.7.2.
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SDM-650B Satellite Modem Remote Control Operation B.2.8 Status Commands/Responses B.2.8.1 Configuration Status B.2.8.1.1 Modulator/Coder Configuration Status The Modulator/Coder configuration status command causes a block of data to be returned by the addressed modem. The block of data reflects the current configuration status of the Modulator/Coder. Command: Response: Rev. 6 add/MCS_”cr” RF_xxx”cr” MF_nnn.nnnn”cr” MPO_snn.n”cr” MOP_snn.n”cr” MR_nnn_mmmm.m”cr” AMRA_nnn_mmmm.
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Remote Control Operation SDM-650B Satellite Modem B.2.8.1.2 Modulator/Coder Configuration Program This command is used by the SMS-658 M:N protection switch to collect information that is necessary to configure backup modems. Command: Response: (See Note 1) (See Note 2) (See Note 1) (See Note 1) (See Note 1) (See Note 1) (See Note 1) (See Note 1) (See Note 1) add/MCP_”cr” MF_nnn.nnnn”cr” MPO_snn.n”cr” LPC_xxx”cr” MOP_snn.n”cr” MR_nnn_mmmm.
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SDM-650B Satellite Modem Remote Control Operation B.2.8.1.3 Demodulator/Decoder Configuration Status The Demodulator/Decoder configuration status command causes a block of data to be returned by the addressed modem. The block of data reflects the current configuration of the demod. Command: Response: (See Note) (See Note) (See Note) add/DCS_”cr” DF_nnn.nnnn”cr” DR_nnn_mmmm.m”cr” ADRA_nnn_mmmm.m”cr” ADRB_nnn_mmmm.m”cr” ADRC_nnn_mmmm.m”cr” ADRD_nnn_mmmm.
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Remote Control Operation SDM-650B Satellite Modem B.2.8.1.4 Demodulator/Decoder Configuration Program This command is used by the SMS-658 M:N protection switch to collect information that is necessary to configure backup modems. Command: Response: (See Note 2) (See Note 2) (See Note 2) (See Note 1) (See Note 1) (See Note 1) (See Note 3) (See Note 3) add/DCP_”cr” IFL_xxx”cr” RFL_xxx”cr” DF_nnn.nnnn”cr” DR_nnn_mmmm.
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SDM-650B Satellite Modem Remote Control Operation B.2.8.1.5 Interface Configuration Status The interface configuration status command causes a block of data to be returned by the addressed modem. The block reflects the current configuration of the interface.
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Remote Control Operation SDM-650B Satellite Modem B.2.8.2 Modem Faults Status (Summary) This command returns the current overall fault conditions of the modem. Command: Response: add/MFS_”cr” DMD_xxx”cr” MOD_xxx”cr” CEQ_xxx”cr” ITX_xxx”cr” IRX_xxx”cr””lf”] Demodulator (FLT/OK) Modulator (FLT/OK) Common Equipment (FLT/OK) Interface Transmit Side (OK/FLT) Interface Receive Side (OK/FLT) B.2.8.
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SDM-650B Satellite Modem Remote Control Operation B.2.8.5 Common Equipment Status The common equipment status command causes a block of data to be returned which indicates the status of the common equipment. Command: Response: add/CES_”cr” M&C_xxx”cr” INT_xxx”cr” BAT_xxx”cr” PS1_xxx”cr” PS2_xxx”cr” PS3_xxx”cr” MODE_xxxxxx”cr” SW_x.
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Remote Control Operation SDM-650B Satellite Modem B.2.8.8 Bit Error Rate Status B.2.8.8.1 Raw BER Command: Response: add/RBER_nnnnE-4”cr””lf”] Where: nnnn = RBER. nnnn = < 1.0 (lower limit). Example: Request raw BER from modem 123. Command: Response: <123/RBER_”cr” >123/RBER_152E-4”cr””lf”] Where: RBER = 0.0152 errors/bit. Note: “No Data” is returned if no carrier is detected (decoder not locked). B.2.8.8.
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SDM-650B Satellite Modem Remote Control Operation B.2.8.9 Eb/N0 The Eb/N0 status command causes the Eb/N0 ratio to be returned. Eb/N0 is returned in dB. Command: Response: add/EBN0_n.ndB”cr””lf”] Example: Request Eb/N0 ratio from modem 2. Command: Response: <2/EBN0_”cr” >2/EBN0_6.2dB”cr””lf”] Where: Eb/N0 = 6.2 dB. Notes: 1. Eb/N0 limits are lower < 3.2 dB, upper > 9.7 dB. 2. “No Data” is returned if no carrier is detected (decoder not locked). B.2.8.
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Remote Control Operation SDM-650B Satellite Modem B.2.8.12 Receive Signal Level Command: Response: add/RSL_-nn.ndBm”cr””lf”] B.2.8.13 Current Sweep Value This command returns the current sweep value and the decoder lock status. Command: Response: add/CSV_snnnnn”cr” CD_xxx”cr””lf”] Where: s = + or - (sweep offset direction). nnnnn = 0 to 25000. xxx = OK or FLT (decoder lock status OK or FAULT). B.2.8.
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SDM-650B Satellite Modem Remote Control Operation B.2.8.16 Stored Faults Information on stored faults is returned when requested. If no stored fault exists for a given fault number, the words “NO FAULT” will be returned instead of the normal time/date status information. The following symbols are commonly used to define the stored faults status commands: • • • • • • • # hh mm ss MM DD YY Fault number (0 to 9), “0” is the first fault stored. Hours in 24-hr. format. Minutes. Seconds. Month. Day. Year. B.
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Remote Control Operation SDM-650B Satellite Modem B.2.8.16.3 Common Equipment Stored Faults Command: Response: add/CSF_# hh:mm:ss M&C_xxx”cr” INT_xxx”cr” BAT_xxx”cr” PS1_xxx”cr” PS2_xxx”cr” PS3_xxx”cr””lf”] MM/DD/YY”cr” Monitor and Control Module (OK/FLT) Data Interface Module (OK/FLT) Battery (OK/FLT) +5V Power Supply (OK/FLT) +12V Power Supply (OK/FLT) -12V Power Supply (OK/FLT) B.2.8.16.
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SDM-650B Satellite Modem Remote Control Operation B.2.8.17 Bulk Consolidated Status This command causes bulk modem status to be returned. To reduce the length of the response, message parameter data are returned without identifiers. However, parameter identification can be determined by order of return. Each status parameter is terminated with a “,” (comma), except for the last parameter, which has the standard message termination sequence (”cr””lf”]).
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Remote Control Operation (See Note 2) (See Note 2) (See Note 2) (See Note 1) (See Note 1) B–68 SDM-650B Satellite Modem Parameter 15 (p15): Demodulator filter B assignment. p15 = nnn_mmmm.m, where “nnn” is the code rate, and “mmmm.m” is the data rate in kbit/s. Parameter 16 (p16): Demodulator filter C assignment. p16 = nnn_mmmm.m, where “nnn” is the code rate, and “mmmm.m” is the data rate in kbit/s. Parameter 17 (p17): Demodulator filter D assignment. p17 = nnn_mmmm.
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SDM-650B Satellite Modem (See Note 1) Remote Control Operation Parameter 40 (p40): Interface buffer size. p40 = nnnnnn, where “nnnnnn” is the currently programmed buffer size in bits. Notes: 1. Available with buffer support hardware only. 2. Parameters 23, 24, and 25 are only returned when fast acquisition is enabled. See the “FAM_” command definition. B.2.8.18 Bulk Consolidated Analog Status This command is similar to the “BCS_” command, but returns modem analog parameters.
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Remote Control Operation SDM-650B Satellite Modem B.2.8.19 Bulk Consolidated Status Faults This command causes all modem fault status to be returned. To reduce the length of the response, fault status is embedded into the bit structure of the characters that are returned. Faults are indicated by a binary 1 in the designated bit position. Command: Response: add/BCSF_abcdefghij”cr””lf”] Where: Character “a”: Modulator fault status character 1. Bit 6 = 1 always. Bit 5 = Modulator fault.
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SDM-650B Satellite Modem Remote Control Operation Where: Character “f”: Common equipment fault status character 2. Bit 6 = 1 always. Bit 5 = Battery fault. Bit 4 = +5V fault. Bit 3 = +12V fault. Bit 2 = -12V fault. Bit 1 = not used. Bit 0 = not used. Where: Character “g”: Interface transmit side faults character 1. Bit 6 = 1 always. Bit 5 = not used. Bit 4 = not used. Bit 3 through Bit 0 = Binary representation (0 to 10) of the number of interface transmit side stored faults.
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Remote Control Operation SDM-650B Satellite Modem B.2.8.20 Change Status This command indicates that a change has or has not occurred on either the BCS_ or the BCSF_ response since the last BCS_ or BCSF_ poll. Command: Response: add/CS_x”cr””lf”] Where: x = “@” = no change since last CS_ poll. “A” = BCS_ response has changed since last CS_ poll. “B” = BCSF_ response has changed since last CS_ poll. “C” = Both responses have changed since last CS_ poll. B.2.8.
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Appendix C. FIELD COMPATIBILITY EFData modems can be configured to be compatible with other modems in the field: • • • Fairchild Comstream Fairchild Aydin data rate This appendix allows the user to configure and/or identify compatible modems. C.
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Field Compatibility SDM-650B Satellite Modem C.2 SDM-650B Fairchild-Compatible Modem To change the standard modem to a Fairchild-compatible modem, the following changes must be made: M&C Software Modulator Card Demodulator Daughter Card U9 FW/0714-6X AS/0773-3 (Resistor Pack Changes) AS/0929-3 — Variable Rate AS/0698-X FDC COMP — Fixed Rate FW/0562-2 Decoder Software U8 C.
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Appendix D. SOFTWARE CHANGE INSTRUCTIONS Steps 1 through 5 are instructions for changing software on the M&C card. Steps 6 through 9 are instructions for changing software on the Viterbi decoder card. If the Viterbi decoder software does not need to be changed, skip to Step 10 and continue. To change the software: 1. Remove the M&C card (AS/0356) using the black card ejector on vertical card. 2. Remove the proms in location U7 and U9 (28 Pin — 0.6” wide). 3.
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Software Change Instructions SDM-650B Satellite Modem 8. Install the new firmware FW/XXXX in UX position on the Viterbi decoder. See Table D-1 for the definition of the various firmware that is available. 9. Re-install the decoder into the modem chassis. 10. Turn ON the power switch. 11. Go to the Utility menu on the front panel, and program the time, day, TXA, TXB, TXC, TXD, RXA, RXB, RXC, and RXD to the new data/code rates.
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Appendix E. AGC INTERFACE The AGC interface option has been designed for external monitoring of the dynamic range of a modem. The AGC interface output will be 0V out for minimum modem power, and +10V out for maximum modem power. Rear panel gain and offset adjustments allow fine tuning of these voltages. The AGC interface output is approximately linear, making it easy to determine the input power to the modem.
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AGC Interface SDM-650B Satellite Modem DATA GROUND ERDE I/OI TX/IF OUTPUT CP1 REMOTE J10 AGC J6 J8 GAIN J9 FAULT MADE IN USA J7 OFFSET J11 RX/IF INPUT CP2 Figure E-1. Rear Panel View E.1 Connector Pinouts The AGC interface is supplied on a 9-pin female D connector that is accessible from the rear panel. Screw locks are provided for mechanical security of the mating connector. Function GROUND AGC OUTPUT NO CONNECTION Name GND AGC-OUT NC Pin # 9 1 2, 3, 4, 5, 6, 7, 8 E.
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SDM-650B Satellite Modem AGC Interface E.2.2 Installation Procedure Refer to Figure E-2 as needed. To install the AGC interface option: 1. Remove the rear panel of the modem. 2. Using the hardware provided, install the AS/0769 board to the modem motherboard between CP1 and CP2 (IF OUT and IF IN). (Refer to Figure E-1.) 3. Attach the following wires to the motherboard: a. b. c. d. E1 E2 E3 E4 ⇒ ⇒ ⇒ ⇒ GND +12V AGC J3, B4 -12V Refer to Figure E-2. 4. Adjust R4 to achieve a reading of approximately 4.
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AGC Interface SDM-650B Satellite Modem Data I/O C1 C3 Gnd -5 +12 -12 +5 IF OUTPUT J8 J5 J4 Remote MOD J1 J6 AS/0769 AGC Interface DECODER J2 C2 Fault GND CP1 E1 E2 E3 E4 J7 IF INPUT DEMOD J3 J9 CP2 Gnd -5 +12 -12 +5 Mother Board Wire Connections 8 1 C B A B4 Figure E-2. Wiring Diagram E–4 Rev.
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SDM-650B Satellite Modem AGC Interface Figure E-3. AGC Adapter Board Rev.
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AGC Interface SDM-650B Satellite Modem This page is intentionally left blank. E–6 Rev.
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Appendix F. ASYNCHRONOUS OVERHEAD CHANNEL UNIT This appendix provides information on operating the modem from the front panel with the asynchronous overhead channel unit option installed. The following version is described: • • Firmware number: Software version: FW/0713-34L 4.12A Notes: 1. The same version of firmware (listed above) is used for the asynchronous overhead channel unit, whether or not the AUPC option is installed.
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Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.1 Functional Description of ASYNC Overhead Channel Unit The ASYNC overhead interface module consists of three subassemblies: • • • Connector board (AS/1328) Terrestrial interface (AS/1311) Data processor board (AS/1289) The connector board provides the physical interface utilizing a 50-pin D connector. The terrestrial interface contains all circuitry required for G.703, RS-422, MIL-STD-188, and V.35 type interfaces for synchronous data.
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SDM-650B Satellite Modem Asynchronous Overhead Channel Unit RECEIVE SECTION TRANSMIT SECTION ES TO ES ASYNC FRAMING/ TIMING LOGIC (MUX) RS-232 INTERFACE P/O INT LPBK MODEM P/O INT LPBK DEFRAME/TIMING LOGIC (DEMUX) RS-232 INTERFACE ES TO ES ASYNC TX DEJITTER G.703 CLK DATA CLK T1/E1 INTERFACE T2/E2 PLESIOCHRONOUS BUFFER P/O BASE BAND LPBK P/O BASE BAND LPBK RS-422 INTERFACE MIL-STD-188-114 T1/E1 T2/E2 G.703 INTERFACE RS-422 INTERFACE MIL-STD 188-114 V.
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Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.1.1 Terrestrial Interface The terrestrial interface (AS/1311) forms the top, when mated with the connector board, of the 2-board module. The terrestrial interface contains all balanced pair drivers and receivers for: • • • RS-422 MIL-STD-188 V.35 Data inputs are send data (SD) and transmit clock (TT or SCTE). Data outputs are modem reference clock (SCT or ST), receive data (RD), and receive clock (RT or SCR).
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SDM-650B Satellite Modem Asynchronous Overhead Channel Unit 1 1 JP11 2 AS/1311 REV ASYNC OVERHEAD TERRESTRIAL INTERFACE BOARD JP1 1 JP4 JP5 JP6 JP7 1 1 1 JP8 1 JP13 1 1 1 JP12 JP9 JP2 2 1 2 JP3 1 JP10 1 Figure F-2. Asynchronous Overhead Interface Board Table F-1. Asynchronous Overhead Jumpers JP # JP1 JP2 JP3 JP10 JP11 JP12 JP8, JP9, JP13 Pin # Function 1 to 3, and 2 to 4 V.35, RS-422, MIL-STD-188 3 to 5, and 4 to 6 G.
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Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.1.2 Multiplexer The data processor (AS/1289) forms the bottom of the 2-board module. This board contains the data multiplexer and demultiplexer. The synchronous data stream is multiplexed with a 1/15 overhead channel, and the resultant information is interfaced to the modulator/coder section of the modem.
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SDM-650B Satellite Modem Asynchronous Overhead Channel Unit F.1.4 Plesiochronous Buffer Where the option is installed, data from the DEMUX section is fed into a plesiochronous buffer. The buffer size is selectable in increments of 1, 2, 4, 6, 8, 12, 24, and 32 ms. The buffer is automatically centered on resumption of service after an outage. The buffer can also be commanded to center from the Config Interface menu of the front panel, or remotely.
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Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.2 ASYNC Interface Connector Pinouts The ASYNC interface is provided on a 50-pin female D connector accessible from the rear panel of the modem. Screw locks are provided for mechanical security of the mating connector.
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SDM-650B Satellite Modem Asynchronous Overhead Channel Unit F.3 ASYNC Interface Specifications Main Channel MIL-STD-188-144 RS-422/-449 V.35 G.703 Data Rates 9.6K, 19.2K, 32 k/bits to 8.448 Mbit/s, in 32 k/bits steps G.703 Data Rates 1.544 Mbit/s Jumper Selectable 2.048 Mbit/s 6.312 Mbit/s 8.448 Mbit/s G.703 Line Code AMI, B8ZS, B6ZS, HDB3 Transmit Clock Reference Internal modem reference or external transmit clock (SCT or TT) Jitter Attenuation Per G.703 Pulse Mask Per G.
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Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.4 Functional Description of ASYNC Overhead Channel Unit with AUPC The ASYNC overhead channel unit with the AUPC option functions very much the same as the original ASYNC overhead channel unit, except for some added features. The connector pinouts and specifications apply to both versions of the ASYNC overhead channel unit.
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SDM-650B Satellite Modem Asynchronous Overhead Channel Unit The action at loss of lock is as follows (modem A loses carrier detect): 1. Modem A sets its power to Nominal, Hold, or Maximum, as specified by Carrier Loss action. 2. Modem A sends Carrier Lost command to modem B. 3. Modem B sets its power to Nominal, Hold, or Maximum, as specified by Remote Carrier Loss action. Note: Local Carrier Loss has priority over Remote Carrier Loss. F.4.
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Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.5 Front Panel Operation Note: The same version of firmware (FW/0713-34L, 4.12A) is used for the asynchronous overhead channel unit, whether or not the AUPC option is installed. However, if the modem hardware does not support AUPC, the AUPC-related menus and options (e.g., SELECT REMOTE; SELECT CONFIG, AUPC) will not be displayed in the front panel menus.
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SDM-650B Satellite Modem Asynchronous Overhead Channel Unit F.5.1 Menus and Options Overview Refer to Section F.5.2 for menu and option explanations. Note: The “A” after the software version designates “Asynchronous.” Table F-3. Main Front Panel Menu with Asynchronous Overhead (with AUPC) Screen SDM650 “TYPE” SW_4.12A SELECT CONFIG Submenus/Options MOD DEMOD INTRFACE AUPC SELECT MONITOR Comments This is an information-only screen. The “A” on line 2 means the asynchronous option is installed.
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Asynchronous Overhead Channel Unit SDM-650B Satellite Modem Table F-5. Select Configuration Demodulator Menu (with AUPC) Menus RX-x Code_Rate Submenus/Options x = A, B, C, D, or V RX_Freq In 2.5 kHz steps. SWP_RACQ 50.000 to 90.000 MHz, or 100.000 to 180.000 MHz ON OFF ON OFF ON OFF 0 to 999 sec SWP_CNTR 0 to 50000 Hz SWP_RNGE -25000 to +25000 Hz SWP_DIR FORWARD REVERSE 1E-3 1E-4 1E-5 1E-6 1E-7 1E-8 NONE Appear only when fast acquisition is turned ON.
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SDM-650B Satellite Modem Asynchronous Overhead Channel Unit Table F-6. Select Configuration Interface Menu (with AUPC) Menus TX_clock Buf_clk RX_clock EXT_REF BBLoopBk INTF_LBk TX CODE RX CODE TX 2047 BUF_SIZE BUF_CNTR TX BAUD RX BAUD Rev. 5 Submenus/Options External Internal Satellite Internal Ext_Ref External Normal Inverted Typical: 1.
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Asynchronous Overhead Channel Unit CH LENTH SDM-650B Satellite Modem 5 bits 6 bits 7 bits 8 bits 1 bit 2 bits EVEN ODD NONE STOP BIT PARITY Table F-7. Select Configuration AUPC Menu (with AUPC) Menus NOM PWR Submenus/Options ON OFF -30 to -5 dBm MIN PWR -30 to -5 dBm MAX PWR -30 to -5 dBm Eb/N0 SP 3.2 to 9.7 dB, in 0.1 dB steps MAX TR 0.5 to 6 dBm/minutes LOCAL CL MAXIMUM NOMINAL HOLD MAXIMUM NOMINAL HOLD AUPC REMOTECL Comments Table F-8.
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SDM-650B Satellite Modem Asynchronous Overhead Channel Unit Table F-9. Select Faults Menu (with AUPC) Menus Mod Flts –––––– – Dmd Flts +–++++–– CEq Flts –––– – TX_INTF –– RX_INTF –– +–+ Rev.
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Asynchronous Overhead Channel Unit SDM-650B Satellite Modem Table F-10. Select Stored Faults (StFaults) Menu (with AUPC) Menus Mod Fltx MM/DD/YY HH/MM/SS Dmd Fltx MM/DD/YY HH/MM/SS CEQ Fltx MM/DD/YY HH/MM/SS TX_INTFx Submenus/Options RF_Syn Data_Clk TClk_Syn I-Channl Q-Channl AGC_levl Module C_Detect RF_Syn Data_Clk I-Channl Q-Channl Dscrambl BERthrsh Module Battery -12 volt +12 volt +5 volt Controlr Intrface TX_PLL Clk_Act Comments Mod Flt0 through Mod Flt9.
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SDM-650B Satellite Modem Asynchronous Overhead Channel Unit Table F-12. Select Utility Menu (with AUPC) Menus Time Date Submenus/Options SS HH:MM AM/PM MM/DD/YY LAMP TEST? YES Add: 1 xxxxyyyy Address = 1 to 255 Parity: Even Odd Baud Rate = 110 to 9600 +20 to -20.0 dB POW ADJ OP MODE FAST ACQ INT_TYPE FILTERS ADJUST TX only RX only DUPLEX ON OFF RS422 V.35 MOD ADJ. DEMOD ADJ. Assign TX_Fltrs Filters = A, B, C, D, or V Assign RX_Fltrs Filters = A, B, C, D, or V Rev. 5 Comments Seconds (SS).
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Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.5.2 Menu Explanations F.5.2.1 Select Configuration Refer to Table F-3. Modem configuration may be viewed or changed by entering the Config menu from the Select menu on the front panel. After entering the Config menu, use [←] and [→] to select one of the following configurations: • • • • MOD DEMOD INTERFACE AUPC Enter the selected Config menu by pressing [ENTER]. Use [←] and [→] to view the selected configuration parameters.
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SDM-650B Satellite Modem Asynchronous Overhead Channel Unit F.5.2.1.1 Configuration Modulator Refer to Table F-4. TX-x TX_Freq Transmitter Rate Selection. Select one of four pre-defined transmitter coder/data rate combinations or a variable rate selection. On entry, the current transmitter rate is displayed with the flashing cursor on the first character of the code rate on line 1. The data rate is displayed on line 2. Use the arrow keys to select one of four pre-defined rates.
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Asynchronous Overhead Channel Unit SDM-650B Satellite Modem CW_Mode Programs the modem for continuous wave mode. (Test Mode Configuration Option) Three modes of operation are available: • • • Center Dual Offset Center Mode: Generates a carrier at the current modulator frequency. This can be used to measure the output frequency. Dual Mode: Generates a dual side-band suppressed carrier signal. Side-bands are at one-half the symbol rate from the carrier.
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SDM-650B Satellite Modem Asynchronous Overhead Channel Unit F.5.2.1.2 Configuration Demodulator Refer to Table F-5. RX-x RX_Freq Receiver Rate Selection. Select one of four pre-defined receiver decoder/data rate combinations or a variable rate selection. On entry, the current receiver rate is displayed with the flashing cursor on the first character of the code rate on line 1. The data rate is displayed on line 2. Use the arrow keys to select one of four pre-defined rates.
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Asynchronous Overhead Channel Unit SWP_RACQ SDM-650B Satellite Modem Sets the sweep reacquisition rate from 0 to 999 seconds. The time selected with this parameter is the time that the modem will remain in a narrow sweep (± 10%) after acquisition has been accomplished. After this timer runs out, the modem will return to the normal sweep. SWP_CNTR On entry, the current programmed setting is displayed with a flashing cursor on the first character. Use [←] and [→] to move the flashing cursor.
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SDM-650B Satellite Modem BERT_set Asynchronous Overhead Channel Unit This function is used to set the BER threshold. If the BER threshold set is exceeded, a receive fault will be indicated by the modem status indicators. BER threshold may be set from 1E-3 to 1E-8, or may be disabled by specifying None. On entry, the current setting of the BER threshold is displayed. Use [↑] and [↓] to select the desired setting. Press [ENTER] to execute the change. F.5.2.1.3 Configuration Interface Refer to Table F-6.
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Asynchronous Overhead Channel Unit SDM-650B Satellite Modem BBLoopBk Programs the modem for baseband loopback operation. (Test Mode Configuration Option) When baseband loopback is turned ON, baseband terrestrial data is looped back on the customer side of the interface. Note: Asynchronous data is not looped back in the baseband loopback operation. INTF_LBk (Test Mode Configuration Option) On entry, the current status is displayed with the flashing cursor on the first character.
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SDM-650B Satellite Modem Asynchronous Overhead Channel Unit RX BAUD Programs the receiver baud rate. CH LENTH On entry, the current receiver baud rate is displayed with the flashing cursor on the first character. Use [↑] and [↓] to select the desired rate. The baud rate may be programmed from 110 to 38,400 bit/s. Press [ENTER] to execute the change. Programs the character length for the ASYNC format.
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Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.5.2.1.4 Configuration AUPC Refer to Table F-7. AUPC Programs the AUPC ON or OFF. NOM PWR On entry, the current status is displayed with the flashing cursor on the first character. Use the arrow keys to select ON or OFF. Press [ENTER] to execute the change. Programs the nominal power value of the AUPC. MIN PWR On entry, the current nominal power value is displayed with the flashing cursor on the first character.
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SDM-650B Satellite Modem Asynchronous Overhead Channel Unit F.5.2.2 Select Monitor Refer to Table F-8. When the Monitor level is entered, use [←] and [→] to select the desired monitor function. Each monitor function is displayed in real time as long as it is selected. Function Raw_BER Cor_BER Eb/N0 SWP Freq Fil_Stat RXSignal RX 2047 Description Raw bit error rate. Range: < 1.0E-4 to 2550E-4 Corrected bit error rate. Range: < 1.0E-8 to > 1E-3 Energy(bit)/noise ratio. Range: < 3.2 to > 9.
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Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.5.2.3 Select Faults Refer to Table F-9. The Faults level is accessible from the Select menu. Faults are similar to monitor functions, they display the current fault status of the group being displayed.
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SDM-650B Satellite Modem Asynchronous Overhead Channel Unit F.5.2.3.1 Modulator Faults (Mod_FLTS) RF_Syn Data Clk TClk Syn I-Channl Q-Channl AGC_levl Module Modulator RF synthesizer fault. Transmit data clock activity fault. Transmit clock synthesizer fault. I channel activity fault. Q channel activity fault. Automatic gain control level fault. Modulator module fault. Typically indicates that the modulator module is missing or will not program. Refer to Section 6.2 for option explanations. F.5.2.3.
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Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.5.2.3.4 Transmit Faults (TX_INTF) The faults listed below are only displayed when the ASYNC overhead channel unit is installed. Refer to Section 6.2 for option explanations. TX_PLL Clk_Act Interface transmit clock phase locked loop fault. Clock activity fault. Activity detector alarm of the selected interface clock. The interface will fall back to the internal clock when this fault is active. F.5.2.3.
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SDM-650B Satellite Modem Asynchronous Overhead Channel Unit F.5.2.4 Select Stored Faults (StFaults) Refer to Table F-10. The modem stores the first 10 (Flt0 to Flt9) occurrences of fault status changes in each of the six major fault categories. Each stored fault status change is stored with the time and date of the occurrence. Stored faults may be viewed by entering the StFaults level from the Select menu.
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Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.5.2.5 Select Remote Refer to Table F-11. The remote functions may be viewed or changed by entering the Remote level from the Select menu on the front panel. After entering the Remote menu, use [←] and [→] to select Config or Monitor configuration. Enter the selected Configuration menu by pressing [ENTER]. Use [←] and [→] to view the selected configuration parameters.
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SDM-650B Satellite Modem Asynchronous Overhead Channel Unit F.5.2.6 Select Utility Refer to Table F-12. The Utility functions provide a means to set the time and date of the modem real time clock circuit. Provisions are also made for assigning data and code rates to the modulator and demodulator. A lamp test function is provided for testing of the front panel optical indicators. Access to the transmitter and receiver data/code rate assignments are also available from within the Utility menu.
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Asynchronous Overhead Channel Unit POW ADJ SDM-650B Satellite Modem Modulator power adjust offset. Allows the operator to offset the modulator output power readout in the Config menu. This will be the highest modulator power that will be displayed and programmed. This feature does not actually change the modulator power level. The function is to change the actual reading to display an offset value in the monitor. The modulator power offset can be set between +20.00 to -20 dB, in 0.5 dB increments.
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SDM-650B Satellite Modem Assign TX_Fltrs Asynchronous Overhead Channel Unit Transmit filter display/assignment utility. Used to view current filter rate assignments and to make filter rate reassignments. The modulator has four symbol rate filters. Each filter is for a specific symbol rate. The data rate and code rate for each filter must be established upon initial modulator installation, and when circumstances indicate the need to do so. Filters are designated as A, B, C, and D.
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Asynchronous Overhead Channel Unit SDM-650B Satellite Modem This page is intentionally left blank. F–38 Rev.
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Appendix G. TROJAN INTERFACE This appendix provides information on the Trojan interface option for the SDM-650B, including: • • • • • • Functional description Connector pinouts Specifications Configuration guidelines Front panel operation information Remote control operation information G.
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Trojan Interface SDM-650B Satellite Modem The data rate synthesizer may take its input reference clock (REF_CLK) from one of four different sources: • • • • Transmit clock Receive clock External Station Clock (MC) Internal clock (SCT) The phase-lock loop which locks to the reference has a very narrow bandwidth, effectively dejittering the reference. The phase-lock loop can handle data rates from 32 kbit/s to 2.048 Mbit/s, in steps of 8 kHz. Transmit and receive data rates do not need to be the same.
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SDM-650B Satellite Modem Trojan Interface Receive Data Rate (kbit/s) N K L 56 64 128 256 512 1024 1544 2048 7 8 16 32 64 128 193 256 64 64 32 16 8 4 2 2 7 8 16 32 64 128 193 256 Receive Data Rate (kbit/s) K L 56 64 128 256 512 1024 1544 2048 64 64 32 16 8 4 2 2 7 8 16 32 64 128 193 256 Receive VCO Frequency (kHz) 3584 4096 4096 4096 4096 4096 3088 4096 Receive VCO Frequency (kHz) 3584 4096 4096 4096 4096 4096 3088 4096 The MIL-STD-188-114 interface provides a Send Timing (ST) clock signal a
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Trojan Interface SDM-650B Satellite Modem Receiver Ready (RR) indicates that an RF carrier is being received and demodulated with a sufficiently low error rate for the decoder to remain locked. The MIL-STD-188-114 interface also provides bi-directional relay loopback of both the clock and data at the DCE interface. In LOOPBACK from the DTE side, SD is connected to RD, and either ST or TT (in INTERNAL or EXTERNAL mode) is looped back to RT.
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SDM-650B Satellite Modem Trojan Interface G.2 Connector Pinouts The Asynchronous dejittered MIL-STD-188-114 interface is provided on a 37-pin female D connector accessible from the rear panel of the modem. Screw locks are provided for mechanical security of the mating connector. Signal Function SIGNAL GROUND SEND DATA SEND TIMING RECEIVE DATA REQUEST TO SEND RECEIVER TIMING CLEAR TO SEND DATA MODE RECEIVER READY TERMINAL TIMING STATION REF TIMING MODULATOR FAULT DEMODULATOR FAULT Rev.
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Trojan Interface SDM-650B Satellite Modem G.3 Specification G.3.1 MIL-STD-188-114 Parameters Circuit Supported Amplitude (RD, RT, ST, DM, RR) DC Offset (RD, RT, ST, DM, RR) Impedance (RD, RT, ST, DM, RR) Impedance (SD, TT, MC) Polarity Phasing (TT, RT) Symmetry (ST, TT, RT) Frequency Stability (ST) Modulator Fault Demodulator Fault SD, ST, TT, RD, RT, DM, RR, MC, MOD FAULT, DEMOD FAULT. 4, ± 2V differential into 100Ω. ± 0.4V. Less than 100Ω, differential. 100, ± 20Ω, differential.
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SDM-650B Satellite Modem Trojan Interface G.4 Configuration Guide Menu Selection BBLoopBk (Baseband Loopback) EXT_REF (Station Clock Freq) REF_CLK (Ref Clock Source) TX_clock RX_clock BUF_CNTR (Center Doppler Buffer) BUF_DPTH (Buffer Depth, bits) Options OFF/ON n kHz (must be evenly divisible by 8 kHz) Transmit Receive External (MC) Internal (SCT) External (TT) Internal (Synthesizer) Normal/Inverted YES/NO 512 bit 1024 bit 2048 bit 4096 bit 8192 bit 16384 bit 32768 bit Notes: 1.
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Trojan Interface SDM-650B Satellite Modem G.4.
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SDM-650B Satellite Modem Trojan Interface G.5 Front Panel Operation The operation of the front panel has the same “look and feel” as the standard modem, except there are a few additional commands for the Trojan interface. Note: For general information on front panel operation, refer to Chapter 4. Refer to Tables G-1 through G-8 for front panel menus and options for the SDM-650B with the Trojan interface option installed. G.5.1 Menus and Options Overview Refer to Section G.5.
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Trojan Interface SDM-650B Satellite Modem Table G-2. Select Configuration Modulator Menu Menus Submenus/Options TX-x Code_Rate x = A, B, C, D, or V TX_Freq 50.0000 to 90.0000 MHz or 100.000 to 180.000 MHz ON OFF -5.0 dBm to -25 dBm RF_Out TX_Power Scramblr Comments In 2.5 kHz steps. In 0.5 dBm steps. ON OFF ON OFF Center Dual Offset DifEncdr CW_Mode Table G-3. Select Configuration Demodulator Menu Menus Comments x = A, B, C, D, or V RX_Freq In 2.5 kHz steps. SWP_RACQ 50.000 to 90.
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SDM-650B Satellite Modem Trojan Interface Table G-4. Select Configuration Interface Menu Menus TX_Clock Submenus/Options BUF_CNTR REF_CLK External Normal Inverted YES/NO? BUF_DPTH 512 to 32768 bits BBLoopBk ON OFF 8 kHz to 10 MHz RX_Clock EXT_REF Ref_Clk Comments In 8 kHz steps. Transmit Receive External Internal Table G-5. Select Monitor Menu Raw_BER Menus Submenus/Options Range: < 1.0E-4 to 2550E-4 Corr_BER Range: > 1E-8 to > 1E-3 Eb/N0 Range: < 3.2 dB to > 9.
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Trojan Interface SDM-650B Satellite Modem Table G-6. Select Faults (StFaults) Menu Menus Mod Flts Dmd Flts CEq Flts Submenus/Options RF_Syn Data_Clk TClk_Syn I-Channl Q-Channl AGC_levl Module C_Detect RF_Syn Data_Clk I-Channl Q-Channl Dscramblr BERthrsh Module Battery -12 volt +12 volt +5 volt BUF_UNFL BUF_OVFL Controlr Intrface Comments Note: Fault conditions are displayed as a “+” on the screen. G–12 Rev.
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SDM-650B Satellite Modem Trojan Interface Table G-7. Select StFaults Menu Menus Mod Fltx MM/DD/YY HH/MM/SS Dmd Fltx MM/DD/YY HH/MM/SS CEq Fltx MM/DD/YY HH/MM/SS CLEAR ?? StFaults Submenus/Options RF_Syn Data_Clk TClk_Syn I-Channl Q-Channl AGC_levl Module C_Detect RF_Syn Data_Clk I-Channl Q-Channl Dscrambl BERthrsh Module Battery -12 volt +12 volt +5 volt BUF_UNFL BUF_OVFL Controlr Intrface YES/NO Comments Mod Flt0 through Mod Flt9. Dmd Flt0 through Dmd Flt9. CEq Flt0 through CEq Flt9. Table G-8.
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Trojan Interface SDM-650B Satellite Modem G.5.2 Menu Explanations Note: Only the differences between the standard front panel menus and the Trojan interface menus are discussed in this section. G.5.2.1 Select Configuration Refer to Chapter 4 for explanations of menus and options. G.5.2.2 Select Monitor Refer to Chapter 4 for explanations of menus and options. G.5.2.3 Select Faults Refer to Chapter 4 for explanations of menus and options. G.5.2.3.
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SDM-650B Satellite Modem Trojan Interface G.5.2.4 Select Stored Faults (StFaults) Refer to Chapter 4 for explanations of menus and options. G.5.2.5 Select Utility Refer to Chapter 4 for explanations of menus and options. Rev.
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Trojan Interface SDM-650B Satellite Modem G.6 Remote Control Operation This section describes the remote control operation of the SDM-650B with the Trojan interface installed. • • Firmware number: Software version: FW/0713-70A 4.13T G.6.1 General Remote controls and status information are transferred via an RS-485 (optional RS-232-C) serial communications link. Commands and data are transferred on the remote control communications link as US ASCII-encoded character strings.
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SDM-650B Satellite Modem Trojan Interface G.6.1.1.1 Start Character A single character precedes all messages transmitted on the remote link. This character flags the start of a message. This character is: • • “<” for commands “>” for responses G.6.1.1.2 Device Address The device address is the address of the one satellite modem which is designated to receive a transmitted command, or which is responding to a command. Valid device addresses are 1 to 3 characters long, and in the range of 1 to 255.
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Trojan Interface SDM-650B Satellite Modem G.6.2 Command/Response The command/response portion of the message contains a variable length character sequence which conveys command and response data. If a satellite modem receives a message addressed to it which does not match the established protocol or cannot be implemented, a negative acknowledgment message is sent in response. This message is: • >add/?ER1_PARITY ERROR”cr””lf”] (Error message for received parity errors.
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SDM-650B Satellite Modem Trojan Interface G.6.4 Configuration Commands/Responses G.6.4.1 Modulator G.6.4.1.1 Set Modulator Frequency Command: Response: add/MF_nnn.nnnn”cr” RF_OFF”cr””lf”] Status Only: Response: add/MF_nnn.nnnn”cr””lf”] Where: nnn.nnnn = 50.0000 to 90.0000 MHz. For the 140 MHz modulator, nnn.nnnn = 50.0000 to 90.0000, and 100.0000 to 180.0000 MHz. Note: When modulator frequency is changed, the RF output is switched OFF. G.6.4.1.
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Trojan Interface SDM-650B Satellite Modem G.6.4.1.3 Modulator Rate The modulator has four symbol rate filters. Each filter is for a specific symbol rate. The data rate and coder rate for each filter must be established upon initial modulator installation, and when circumstances indicate the need to do so. Filters are designated as A, B, C, and D. If a filter is not physically present in the system, it may be assigned N/A (not assigned).
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SDM-650B Satellite Modem Trojan Interface G.6.4.1.3.2 Select Modulator Rate Command: Response: add/SMRx_”cr” RF_OFF”cr””lf”] Status Only: (See the MR command.) Where: x = A, B, C, or D (Filter designator). Notes: 1. Setting the modulator turns OFF the RF transmitter. 2. If the modem is commanded to a filter (rate) which is not assigned (N/A), the error 2 message will be returned. G.6.4.1.3.
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Trojan Interface SDM-650B Satellite Modem G.6.4.1.3.5 Set Modulator Output Power Level Command: Response: add/MOP_snn.n”cr””lf”] Status Only: Response: add/MOP_snn.n”cr””lf”] Where: For the 140 MHz modulator, snn.n = +20.0 to -45.0, in 0.5 dB increments. For the 70 MHz modulator, snn.n = +20.0 to -30.0, in 0.5 dB increments. Notes: 1.
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SDM-650B Satellite Modem Trojan Interface G.6.4.2 Demodulator G.6.4.2.1 Set Demodulator Frequency Command: Response: add/DF_nnn.nnnn”cr””lf”] Status Only: Response: add/DF_nnn.nnnn”cr””lf”] Where: For the 140 MGz modulator, nnn.nnnn = 50.0000 to 90.0000, and 100.0000 to 180.0000. G.6.4.2.2 Demodulator Rate The demodulator has four symbol rate filters. Each filter is for a specific symbol rate.
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Trojan Interface SDM-650B Satellite Modem G.6.4.2.2.1 Demodulator Filter Rate Assignment Command: Response: add/ADRx_nnn_mmmm.m”cr””lf”] Status Only: Response: add/ADRx_nnn_mmmm.m”cr””lf”] Where: nnn = 1/2, 3/4, 7/8, or BP12 (Decoder rate). mmmm.m = 9.6 to 4080.0 (Data rate). Note: The parameters “nnn_mmmm.m” may be replaced by “N/A” to indicate “no assignment.” Example: Command: Response: add/ADRx_N/A”cr””lf”] G.6.4.2.2.
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SDM-650B Satellite Modem Trojan Interface G.6.4.2.3 Descramble Enable Command: Response: add/DE_xxx”cr””lf”] Status Only: Response: add/DE_xxx”cr””lf”] Where: xxx = ON or OFF. G.6.4.2.4 IF Loopback Command: Response: add/IFL_xxx”cr””lf”] Status Only: Response: add/IFL_xxx”cr””lf”] Where: xxx = ON or OFF. G.6.4.2.
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Trojan Interface SDM-650B Satellite Modem G.6.4.2.7 Fast Acquisition Mode This command is used to enable or disable fast acquisition and directed sweep modes of operation. When fast acquisition is enabled, the fast acquisition algorithm (requires hardware calibration) is used for acquisition of receive symbol rates of 128 kbit/s or lower.
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SDM-650B Satellite Modem Trojan Interface G.6.4.2.9 Sweep Width Range This command sets the overall travel of the sweep during acquisition. The sweep width may be set in the range of 0 to 50000 Hz. Command: Response: add/SWR_nnnnn”cr””lf”] Status Only: Response: add/SWR_nnnnn”cr””lf”] Where: nnnnn = 0 to 50000. Note: This command is only valid when Fast Acquisition is enabled. See the “FAM_” command definition. G.6.4.2.
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Trojan Interface SDM-650B Satellite Modem G.6.4.3 Interface/Doppler Buffer G.6.4.3.1 Baseband Loopback Command: Response: add/BBL_xxx”cr””lf”] Status Only: Response: add/BBL_xxx”cr””lf”] Where: xxx = ON or OFF. G.6.4.3.2 Transmit Clock Command: Response: add/TC_xxx”cr””lf”] Status Only: Response: add/TC_xxx”cr””lf”] Where: xxx = REF (Reference) or EXT (External). G.6.4.3.
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SDM-650B Satellite Modem Trojan Interface G.6.4.3.5 Interface Reference Clock Command: Response: add/IRC_xxx”cr””lf”] Status Only: Response: add/IRC_xxx”cr””lf”] Where: xxx = TXC (Transmit), RXC (Receive), EXT (External), or INT (Internal). G.6.4.3.6 Interface Buffer Center This command centers the Doppler buffer. Command: Response: add/IBC_”cr””lf”] G.6.4.3.7 Interface Buffer Depth This command sets the Doppler buffer depth in bits.
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Trojan Interface SDM-650B Satellite Modem G.6.4.4 System Commands/Responses G.6.4.4.1 Time of Day Command: Response: add/TIME_hh:mmxx”cr””lf”] Status Only: Response: add/TIME_hh:mmxx”cr””lf”] Where: hh = hours. mm = minutes. xx = AM or PM. Example: Set modem 67 time to 10:45PM. Command: Response: <67/TIME_10:45PM”cr” >67/TIME_10:45PM”cr””lf”] G.6.4.4.
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SDM-650B Satellite Modem Trojan Interface G.6.4.4.3 Remote Configures the modem for remote operation. The modem will respond to any status request at any time. However, the modem must be in “Remote Mode” to change configuration parameters. Command: Response: add/REM_”cr””lf”] G.6.4.4.4 Clear Stored Faults This command is used to clear all stored faults logged by the modem. Command: Response: add/CLSF_”cr””lf”] G.6.4.4.
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Trojan Interface SDM-650B Satellite Modem G.6.4.5 Status Commands/Responses G.6.4.5.1 Configuration G.6.4.5.1.1 Modulator/Coder Configuration Status The Modulator/Coder configuration status command causes a block of data to be returned by the addressed modem. The block of data reflects the current configuration status of the Modulator/Coder. Command: Response: G–32 add/MCS_”cr” RF_xxx”cr” MF_nnn.nnnn”cr” MPO_snn.n”cr” MOP_snn.n”cr” MR_nnn_mmmm.m”cr” AMRA_nnn_mmmm.m”cr” AMRB_nnn_mmmm.
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SDM-650B Satellite Modem Trojan Interface G.6.4.5.1.2 Modulator/Coder Configuration Program This command is used by the SMS-658 or SMS-758 M:N protection switch to collect information that is necessary to configure back-up modems. Command: Response: add/MCP_”cr” MF_nnn.nnnn”cr” MPO_snn.n”cr” MOP_snn.n”cr” MR_nnn_mmmm.
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Trojan Interface SDM-650B Satellite Modem G.6.4.5.1.4 Demodulator/Decoder Configuration Program This command is used by the SMS-658 or SMS-758 M:N protection switch to collect information that is necessary to configure back-up modems. Command: Response: add/DCP_”cr” IFL_xxx”cr” RFL_xxx”cr” DF_nnn.nnnn”cr” DR_nnn_mmmm.
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SDM-650B Satellite Modem Trojan Interface G.6.4.5.2 Modem Faults Status (Summary) This command returns the current overall fault conditions of the modem. Command: Response: add/MFS_”cr” DMD_xxx”cr” MOD_xxx”cr” CEQ_xxx”cr””lf”] Demodulator (FLT/OK) Modulator (FLT/OK) Common Equipment (FLT/OK) G.6.4.5.3 Modulator Status The modulator status is returned as a block of data which indicates general status information.
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Trojan Interface SDM-650B Satellite Modem G.6.4.5.5 Common Equipment Status The common equipment status command causes a block of data to be returned which indicates the status of the common equipment. Command: Response: add/CES_”cr” M&C_xxx”cr” REF_xxx”cr” OVFL_xxx”cr” UNFL_xxx”cr” BAT_xxx”cr” PS1_xxx”cr” PS2_xxx”cr” PS3_xxx”cr” MODE_xxxxxx”cr” SW_x.
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SDM-650B Satellite Modem Trojan Interface G.6.4.5.6.2 Corrected BER Command: Response: add/CBER_nE-m”cr””lf”] Example: Request Corrected BER from modem 19. Command: Response: <19/CBER_”cr” >19/CBER_2E-5”cr””lf”] CBER = 0.00002 errors/bit Notes: 1. Corrected BER limits are lower < 1E-8, upper > 01E-3. 2. “No Data” is returned if no carrier is detected (decoder not locked). G.6.4.5.7 Eb/N0 The Eb/N0 status command causes the Eb/N0 ratio to be returned. Eb/N0 is returned in dB.
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Trojan Interface SDM-650B Satellite Modem G.6.4.5.9 Demodulator Rate Command: Response: add/DR_nnn_mmmm.m”cr””lf”] Where: nnn = 1/2, 3/4, 7/8, or BP12 (Coder rate). mmmm.m = 9.6 to 4080.0 (Data rate). Note: The parameters “nnn_mmmm.m” may be replaced by “N/A” to indicate “no assignment.” G.6.4.5.10 Receive Signal Level Command: Response: add/RSL_-nn.ndBm”cr””lf”] G.6.4.5.11 Current Sweep Value This command returns the current sweep value and the decoder lock status.
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SDM-650B Satellite Modem Trojan Interface G.6.4.5.12.1 Modulator Stored Faults Command: Response: add/MSF_# hh:mm:ss MM/DD/YY”cr” MOD_xxx”cr” Module missing or wont program (OK/FLT) AGC_xxx”cr” AGC leveled (OK/FLT) SYN_xxx”cr” Carrier synthesizer (OK/FLT) BCLK_xxx”cr” Bit clock (OK/FLT) TCLK_xxx”cr” Transmit clock (OK/FLT) ICH_xxx”cr” I-channel (OK/FLT) QCH_xxx”cr””lf”] Q-channel (OK/FLT) G.6.4.5.12.
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Trojan Interface SDM-650B Satellite Modem G.6.4.5.13 Bulk Consolidated Status This command causes bulk modem status to be returned. To reduce the length of the response, message parameter data are returned without identifiers. However, parameter identification can be determined by order of return. Each status parameter is terminated with a “,” (comma), except for the last parameter which has the standard message termination sequence (”cr””lf”]).
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SDM-650B Satellite Modem (See Note) (See Note) (See Note) Trojan Interface Parameter 15 (p15): Demodulator filter A assignment. p15 = nnn_mmmm.m, where “nnn” is the code rate, and “mmmm.m” is the data rate in kbit/s. Parameter 16 (p16): Demodulator filter B assignment. p16 = nnn_mmmm.m, where “nnn” is the code rate, and “mmmm.m” is the data rate in kbit/s. Parameter 17 (p17): Demodulator filter C assignment. p17 = nnn_mmmm.m, where “nnn” is the code rate, and “mmmm.m” is the data rate in kbit/s.
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Trojan Interface SDM-650B Satellite Modem G.6.4.5.14 Bulk Consolidated Analog Status This command is similar to the “BCS_” command, but returns MODEM analog parameters. Command: Response: add/BCAS_p1,p2,p3, . . . pn”cr””lf”] Where: pn = Parameter 1 (p1): Receive signal level. p1 = -nn, where “nn” is the value of the receive signal level in dBm. Parameter 2 (p2): Raw BER. p2 = nnnnE-4, where “nnnn” is the raw bit errors in 10000 bits. Parameter 3 (p3): Corrected BER.
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SDM-650B Satellite Modem Trojan Interface Character “c”: Demodulator fault status character 1. Bit 6 = 1 always. Bit 5 = Demodulator fault. Bit 4 = Carrier detect status (0 for decoder lock). Bit 3 through Bit 0 = Binary representation (0 to 10) of the number of demodulator stored faults. Character “d”: Demodulator fault status character 2. Bit 6 = 1 always. Bit 5 = Demodulator RF synthesizer fault. Bit 4 = Descrambler fault. Bit 3 = I-channel fault. Bit 2 = Q-channel fault. Bit 1 = Bit clock fault.
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Trojan Interface SDM-650B Satellite Modem G.6.4.5.17 Equipment Type This command returns the equipment model number and M&C firmware version number. Command: Response: add/ET_SDM650S_x.xxx”cr””lf”] Where: x.xxx = M&C firmware version. G–44 Rev.
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Glossary The following is a list of acronyms and abbreviations that may be found in this manual. Acronym/ Abbreviation Ω 16QAM 8PSK A A/D AC ADC ADJ ADMA ADPCM AFC AGC AIS AM AMI AOC APM ASC ASCII ASK ASYNC AUPC AUX 1 AVC BB BCD BER BER CONT bit/s BPSK Rev.
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Glossary SDM-650B Satellite Modem BTU BW BWR C C/N C/No CCITT CDMA CH CHNL CIC CL CLK CLNA CLR CMOS Coax Codec COM CPFSK CPSK CPU cr CRC CRT CS CSC CSMA CTS CU CW D&I D/A D/C DAC DAMA dB dB/Hz dBc dBm dBm0 dBW DC DCE DCPSK DDO DDS Demod DEMUX DET DM DPCM DPSK DSP DSR g–2 British Thermal Unit Backward Alarm or Bandwidth Bandwidth Ratio Celsius Carrier-to-Noise Ratio Carrier-to-Noise Density Ratio International Telephone and Telegraph Consultative Committee Code Division Multiple Access Channel Channel Co
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SDM-650B Satellite Modem DTE E&M Eb/N0 ECL EDP EEPROM EFD EIA EMC EMF EPROM ESC ESD EXC EXT FDC FDMA FEC FET FFSK FIFO Flt FM FPGA FS FSK FW GHz GND HI STAB HPA Hz I&Q I/O IBS IC IDI IDR IESS IF INMARSAT INTELSAT ISD k KΩ kbit/s kHz ks/s kW LAN LCD LED lf LNA LO LSB Rev.
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Glossary SDM-650B Satellite Modem LSI m M&C mA Max Mbit/s MC MFS MHz Min Mod MOP MPC ms Ms/s MSB MUX n N/A NACK NC NO NRZ ns OQPSK OSC p P-P P/AR PAL PC PCB PCM PECL pF PK PLL PN PPM PS PSK PWB PWR QAM QPSK RAM RD REF RF RLSD RMA ROM RR RS RT RTS g–4 Large Scale Integration (semiconductors) Mille (10-3) Monitor and Control Milliamperes Maximum Megabits per second Monitor and Control Multiframe Sync Megahertz (106 Hertz) Minimum or Minute Modulator Modulated Output Power Microprocessor Controller Millise
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SDM-650B Satellite Modem Glossary RX RXCLK RXD RZ s S/N SCPC SCR SCT SCTE SD SFS SMS SN SSB SSPA ST SW SYNC TB TCXO TDMA TEMP TERR TP TT TTL TX TXCLK TXD TXO U/C UART UHF UNK US UW V VAC VCO VCXO VDC VSWR W WG Rev.
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Glossary SDM-650B Satellite Modem This page is intentionally left blank. g–6 Draft Rev.
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METRIC CONVERSIONS Units of Length Unit Centimeter Inch Foot Yard Mile Meter Kilometer Millimeter 1 centimeter — 0.3937 0.03281 0.01094 6.214 x 10-6 0.01 — — 1 inch 2.540 — 0.08333 0.2778 1.578 x 10-5 0.254 — 25.4 1 foot 30.480 12.0 — 0.3333 1.893 x 10-4 0.3048 — — 1 yard 91.44 36.0 3.0 — 5.679 x 10-4 0.9144 — — 1 meter 100.0 39.37 3.281 1.094 6.214 x 10-4 — — — 1 mile 1.609 x 105 6.336 x 104 5.280 x 103 1.760 x 103 — 1.609 x 103 1.
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