Comtech EF Data is an ISO 9001 Registered Company SDM-309B Satellite Modem Installation and Operation Manual Part Number MN/SDM309B.
Comtech EF Data is an ISO 9001 Registered Company SDM-309B Satellite Modem Installation and Operation Manual Part Number MN/SDM309B.IOM Edition 2 February 29, 1992 Special Instructions: This is the second edition of the manual. Copyright © Comtech EF Data, 2006 All rights reserved. Printed in the USA. Comtech EF Data, 2114 West 7th Street, Tempe, Arizona 85281 USA, (480) 333-2200, FAX: (480) 333-2161.
Warranty Policy This Adaptive Broadband product is warranted against defects in material and workmanship for a period of one year from the date of shipment. During the warranty period, Adaptive Broadband will, at its option, repair or replace products that prove to be defective. For equipment under warranty, the customer is responsible for freight to Adaptive Broadband and all related custom, taxes, tariffs, insurance, etc.
Preface About this Manual Effective April 29, 1999, California Microwave EFData has changed its name to Adaptive Broadband Corporation to reflect its focus as a leading architect of the wireless broadband evolution. This manual provides installation and operation information for the Adaptive Broadband SDM-309B satellite modem. This is a technical document intended for earth station engineers, technicians, and operators responsible for the operation and maintenance of the SDM-309B.
Preface SDM-309B Satellite Modem Trademarks Product names mentioned in this manual may be trademarks or registered trademarks of their respective companies and are hereby acknowledged. Reporting Comments or Suggestions Concerning this Manual Comments and suggestions regarding the content and design of this manual will be appreciated. To submit comments, please contact the Adaptive Broadband Customer Support Department according to the following information. ii Rev.
SDM-309B Satellite Modem Preface Customer Support Contact the Adaptive Broadband 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 Adaptive Broadband Customer Support representative may be reached at: Adaptive Broadband Attention: Customer Support Department 2114 West 7th Street Tempe, Arizona 85281 USA (480) 333-2200 (Main Adaptive Broadband Number) (48
Preface SDM-309B Satellite Modem This page is intentionally blank. iv Rev.
Table of Contents CHAPTER 1. INTRODUCTION...................................................................................1–1 1.1 Scope ................................................................................................................................................................. 1–1 1.2 Purpose And Function ..................................................................................................................................... 1–1 1.3 Description.............................
Table of Contents SDM-309B Satellite Modem 3.1.4.1 MOD Configuration ............................................................................................................................ 3–4 3.1.4.2 DEMOD Configuration ....................................................................................................................... 3–5 3.1.4.3 Interface Configuration ....................................................................................................................... 3–8 3.1.
SDM-309B Satellite Modem Table of Contents 4.2.1.8 IBS Interface Specification................................................................................................................ 4–15 4.2.1.9 IBS Interface Breakout Panel ............................................................................................................ 4–17 4.2.1.9.1 IBS Terrestrial Interface (J1) ..................................................................................................... 4–19 4.2.1.9.
Table of Contents SDM-309B Satellite Modem CHAPTER 5. THEORY OF OPERATION ...................................................................5–1 5.1 Modulator ......................................................................................................................................................... 5–1 5.1.1 General description..................................................................................................................................... 5–1 5.1.2 Specifications..........
SDM-309B Satellite Modem Table of Contents 6.6 Repacking For Shipment............................................................................................................................... 6–22 APPENDIX A. DATA RATES AND FILTERS ............................................................ A–1 APPENDIX B. SATELLITE MODEM REMOTE CONTROL....................................... B–1 APPENDIX C. EXTERNAL CHANNEL UNIT............................................................. C–1 APPENDIX D.
Table of Contents SDM-309B Satellite Modem This page is intentionally blank. x Rev.
Chapter 1. INTRODUCTION 1.1 Scope This manual describes the SDM-309B Satellite Modem, hereinafter referred to as the modem (Figure 1-1). It includes installation, operation, and maintenance instructions. A description of the equipment is contained in Section 1. Section 2 provides the installation instructions. The use of controls, indicators, and operation is described in Section 3. Maintenance instructions are in Section 4. 1.
Introduction SDM-309B Satellite Modem the modem are located on the front panel. The chassis also contains the power supply, and a fan is on the rear panel. A system block diagram is shown in Figure 1-4. 1-1–2 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Introduction Figure 1-1 SDM-309B Modem MN/U-SDM309B Rev.
Introduction SDM-309B Satellite Modem Figure 1-2 Satellite Communications System With SDM-309B Modem 1-1–4 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Introduction Figure 1-3 Modular Construction MN/U-SDM309B Rev.
Introduction SDM-309B Satellite Modem Figure 1-4 SDM-309B Block Diagram 1-1–6 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Introduction The modem consists of the following assemblies: Assembly Chassis with Power Supply PCB, Monitor and Control PCB, Modulator PCB, Demodulator PCB, Viterbi Decoder PCB, Front Panel Control Board PCB, Mother Board PCB, Internal Channel Unit (IBS) (D&I) (External Channel Unit) PCB, Mod Daughter Variable Rate PCB, Mod Daughter Fixed Rate PCB, Demod Daughter Variable Rate PCB, Demod Daughter Fixed Rate Drawing No.
Introduction SDM-309B Satellite Modem Forward Error Correction Convolutional Encoding with Soft Decision K7 Viterbi Decoding Data Scrambling Selectable, Synchronous (Per IESS-309 Rev 3 Section 4.4.5) or None Diagnostic Features RF Loopback Digital Data Loopback Fault Monitoring Bit Error Rate Monitoring Remote Control via Serial Port Prime Power 90-132 VAC or 180 to 264 VAC, 47-63 Hz 75 W Max. Fused at 2 A Size 5.25" H by 19.0" W by 18.
SDM-309B Satellite Modem Introduction Configuration Retention Will Maintain Current Configuration for 30 days Minimum Without Power Addressing Programmable to 1 of 256 Possibilities Address 0 Reserved for Global Addressing Local Control of All Remote Functions Included Via Pushbutton Entry. Table 1-2 BER Performance Specification Note: The bit energy-to-noise ratio (Eb/N0) required to achieve 10-3 to 10-8 bit error rates at various data rates for different coding configurations is shown below.
Introduction SDM-309B Satellite Modem Figure 1-5 Typical Bit Error Rate Performance 1-1–10 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Introduction Figure 1-6 SDM-309B Modem Typical Output Spectrum MN/U-SDM309B Rev.
Introduction 1-1–12 SDM-309B Satellite Modem MN/U-SDM309B Rev.
Chapter 2. INSTALLATION 2.1 Unpacking The modem and manuals are packaged in pre-formed reusable foam inside a cardboard carton. To remove the modem proceed as follows: ! CAUTION Do not use any cutting edged tool that will extend more than one inch into the container and cause damage to the modem a. Cut the tape at the top of the carton. b. Lift off the foam containing the modem. c. Save the packing material for reshipment either back to the factory or to another site. d.
Installation 2-2–2 SDM-309B Satellite Modem FAULT J7 9 PIN "D" 2.2.3 IF OUTPUT IF INPUT AC POWER GND CP1 CP2 NONE NONE BNC BNC STANDARD #10-32 STUD 2.2.4 2.2.5 2.2.6 2.2.7 FORM C FAULT RELAY CONTACTS TX IF OUTPUT RX IF INPUT AC POWER INPUT CHASSIS GROUND MN/U-SDM309B Rev.
SDM-309B Satellite Modem Installation Figure 2-1 Rear Panel View MN/U-SDM309B Rev.
Installation SDM-309B Satellite Modem 2.2.1 Data I/O For information and pinouts on the data connectors, please refer to the appropriate subSection in Section 4.2 and Appendix C. 2.2.2 Remote (J6) The remote connector on the modem is used to interface the Monitor and Control functions to a remote location. This interface can be either RS232 or RS485. For a complete discussion on the remote interface, refer to Sections 4.1.2 and 4.1.3. 2.2.2.
SDM-309B Satellite Modem 3. 4. 5. 6. 7. 8. 9. Installation NC NO COM NC NO COM NC 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. 2.2.4 IF Output (CP1) This is the transmit IF connector. The output impedance is 75 ! and the output power level is -5 to -15dBm.
Installation SDM-309B Satellite Modem (Operation Mode). Enter the menu and select TX only. This will mask the receive faults and receive stored faults in the faults menu. For a RX only system, the modulator (0773-X) is removed. Enter the Utility Menu on the front panel and select OP MODE). Enter the menu and select RX only. This will mask the transmit faults and transmit stored faults in the faults menu. The modem interface is configured by the selection of the data interface card. Refer to Section 4.
Chapter 3. OPERATION 3.1 SDM 309/M1200P Front Panel 3.1.1 General The following is a Step by Step explanation and procedure for operating the SDM 309B modem, hereafter referred to as the modem, with an internal IBS channel unit. The complete front panel operation is described below. The Modem front panel (Figure 3-1) provides the local user interface which is necessary to configure and monitor status of the satellite modem.
Operation SDM-309B Satellite Modem Test Mode (Yellow LED) Flashes when the modem is in a test configuration. 3.1.3 Front Panel Controls The Modem is locally operated by using the front panel key-pad (Figure 3-1). The keypad consists of six keys: Enter, Clear, Right Arrow, Left Arrow, Up Arrow, and Down Arrow.
SDM-309B Satellite Modem Operation Figure 3-1 Front Panel View MN/U-SDM309B Rev.
Operation SDM-309B Satellite Modem 3.1.4 Configuration Modem configuration may be viewed or changed by entering the “CONFIG” level from the ‘sELECT” menu on the front panel. After entering the “CONFIG” menu, use the right and left arrow keys to select “MOD”, “DEMOD”, or “INTERFACE” configuration. Enter the selected configuration menu by pressing the “ENTER” key. Use the right and left arrow keys to view the selected configuration parameters.
SDM-309B Satellite Modem TX_Power Operation Programs the modulator output power level from -5 dB to -30 dBm in .5 dB Steps. On entry the current transmitter power level is displayed with the flashing cursor on the first character. The up and down keys are used to increase or decrease the output power level in .5 dBm Steps. Press the “ENTER” key to execute the change.
Operation SDM-309B Satellite Modem RXA Receiver rate selection. Select one of four predefined 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 one. The data rate is displayed on line two. Use the arrow keys to select one of four predefined rates. Filters that are not present may display as “N/A” (not assigned) and can not be programmed.
SDM-309B Satellite Modem SWP-RACQ **SWP_CNTR Operation Programs the sweep reacquisition mode time duration. 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. On entry the current programmed setting is displayed with a flashing cursor on the first character.
Operation SDM-309B Satellite Modem 3.1.4.3 Interface Configuration TX_clock BUF_Clk RX_Clock Ext_REF BBLoopBk INTF_LBk Programs the clock source for the modem transmitter clock. “Internal” sets the TX clock to operate from the modem internal clock, this is also the fallback clock. “External” sets the TX clock to operate from the external reference clock. This clock must be frequency locked to the data that is being transmitted.
SDM-309B Satellite Modem CODING TX_2047 TXD_FLT RXD_FLT BUF_SIZE BUF_CNTR READ_ERR Operation Programs the modem for “AMI”, “B8ZS”, “B6ZS”, or “HDB3” coding of the baseband data. On entry the current coding format is displayed. Use the arrow keys to select the desired coding format. Press the “ENTER” key to execute the change. *Programs the modem to insert a 2047 pattern in lieu of the normal transmit data. On entry the current status is displayed with the flashing cursor on the first character.
Operation SDM-309B Satellite Modem 3.1.5 Monitor When the “MONITOR” level is entered use the right and left arrow keys to select the desired monitor function. Each monitor function is displayed in real time as long as it is selected. Raw_BER - Raw bit error rate. * Range: <1.0E-4 to >2550E-4 Cor_BER - Corrected bit error rate. * Range: <1.0E-8 to >1E-3 Eb/N0 - Energy(bit)/noise ratio. * Range: <3.2 dB to >16.0 dB Swp_Freq - Sweep Monitor** *Range: -25,000 Hz to +25,000 Hz RxSignal - Receive signal level.
SDM-309B Satellite Modem Operation 3.1.6.1 Mod_Flts - Modulator Faults RF_Syn Data_Clk TClk_Syn I-Channl Q-Channl AGC_level Module Modulator RF synthesizer fault. Transmit data clock activity indicator. 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. 3.1.6.
Operation SDM-309B Satellite Modem Data/AIS FRM_BER BW_ALM RX_PLL Buff_Clk MUX_lock Data or Alarm Indication Signal. When Data_FLT is selected in the Interface Configuration menu the fault indicates a Data stable condition. When AIS is selected, the fault indicates data is all 1’s. Refer to Section 4.3 (Interface Configuration for a detailed description of these faults. Frame BER fault. Indicates that the frame BER exceeds 1E-3. Backward Alarm Fault. Receive Phase Locked Loop Fault.
SDM-309B Satellite Modem Operation After entering the “UTILITY” functions level use the right and left arrow keys to select the utility function of interest. The current time and date can be displayed and changed as required. Access to the transmitter and receiver Data/Code Rate assignment and the lamp test functions are also available from within the utility functions level.
Operation SDM-309B Satellite Modem OP MODE Fast ACQ INTRFACE Filter Adjust Assign TX_Fltrs Operation Mode. Programs the modem operation for TX only, RX only, or Duplex operation. On entry the flashing cursor is on the first character of the display. Use the arrow keys to select TX only, RX only, or Duplex. Press the “ENTER” key to execute the change. When TX only or RX only is selected, the appropriate faults are masked from the Faults and Stored Faults menu. Fast Acquisition function.
SDM-309B Satellite Modem Assign RX_Fltrs Operation Receive filter display/assignment utility. Used to view current filter rate assignments and to make filter rate reassignments. Refer to the previous text under “Assign TX_Fltrs”. The receive filters assignments are basically identical. MN/U-SDM309B Rev.
Operation SDM-309B Satellite Modem Figure 3-2 Menu Tree 3–16 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Operation Figure 3-3 Menu Tree MN/U-SDM309B Rev.
Operation SDM-309B Satellite Modem Figure 3-4 Menu Tree 3–18 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Operation Figure 3-5 Menu Tree MN/U-SDM309B Rev.
Operation SDM-309B Satellite Modem Figure 3-6 Menu Tree 3–20 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Operation Figure 3-7 Menu Tree MN/U-SDM309B Rev.
Operation SDM-309B Satellite Modem Figure 3-8 IF Loopback 3–22 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Operation Figure 3-9 RF Loopback MN/U-SDM309B Rev.
Operation SDM-309B Satellite Modem Figure 3-10 Interface Loopback 3–24 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Operation Figure 3-11 Baseband Loopback MN/U-SDM309B Rev.
Operation SDM-309B Satellite Modem 3.2 Drop And Insert Front Panel Operation 3.2.1 General The following is a Step by Step explanation and procedure for operating the SDM 309B modem, hereafter referred to as the modem, with an internal drop and insert channel unit. The operation of the front panel is the same “look and feel” as the SDM 309 modem without the drop and insert channel unit, except there are additional commands for the drop and insert channel unit.
SDM-309B Satellite Modem Operation 3.2.2.1 MOD Configuration TXA TX_Freq Transmitter rate selection. Select one of four predefined 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 one. The data rate is displayed on line two. Use the arrow keys to select one of four predefined rates.
Operation SDM-309B Satellite Modem CW_Mode *Programs the modem for continuous wave mode. Three modes of operation are available: center, dual, and offset modes. Center Mode: Generates a carrier at the current modulator frequency. This can be used to measure the output power and output frequency. Dual Mode: Generates a dual side-band suppressed carrier signal. Side-bands are at one half (1/2) the symbol rate from the carrier. This is used to check the channel balance and carrier null.
SDM-309B Satellite Modem IFLoopBk RFLoopBk SWP_RACQ **SWP_CNTR Operation *Programs the modem for IF loopback operation. When the IF loopback is turned on the demodulator input is connected to the modulator output through an attenuator and the demodulator is programmed to the same frequency as the modulator. An attenuator within the modem connects the IF out to the IF in. When IF loopback is turned off the demodulator is turned to it’s previous frequency and is reconnected to the IF input.
Operation SDM-309B Satellite Modem **SWP_DIR Programs the direction of the sweep travel in the directed sweep mode. BERT_set On entry the current programmed setting is displayed with the flashing cursor on the first character. Use the arrow keys to select Forward (+) or Reverse (-). Press the “ENTER” key to execute the change. 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.
SDM-309B Satellite Modem BBLoopBk Operation *Programs the modem for baseband loopback operation. When baseband loopback is turned on insert data is looped back on the customer side of the interface. Note: The drop data is hard wired into loopback causing the BBLoopBk function to affect only the insert data. See Figure 3-10 for a block diagram of Baseband loopback operation. INTF_LBk On entry the current status is displayed with the flashing cursor on the first character.
Operation SDM-309B Satellite Modem TXD_FLT RXD_FLT BUF_SIZE BUF_CNTR READ_ERR Transmit Data Fault. This configuration function is used to select a Transmit Interface fault monitor of AIS, Data, or none. When AIS (Alarm Indication Signal) is selected the TX_INTF (Transmit Interface) fault “Data/AIS” is monitoring a fault condition of all 1’s from customer data input to the modem. When Data_Flt is selected, the TX_INTF fault “Data/AIS” is monitoring a fault condition of all 1’s or all 0’s.
SDM-309B Satellite Modem DRP_DATA INS_DATA DROP CHANNELS Operation This configuration is used to select the desired drop data channel signaling. The choices are E1CCS (E1 Common Channel Signaling), E1CAS (E1 Channel Associated Signaling), E1_IBS, T1_IBS, E1_31_TS, T1 (T1 data signal), and T1ESF (T1 Extended Super Frame). On entry the current drop data channel signal is displayed with the flashing cursor on the first character.
Operation SDM-309B Satellite Modem INSERT CHANNELS Programs the Satellite bearer channels into the desired Terrestrial frame slot from 1 to 31 for E1CCS, E1_31_TS, and E1CAS and from channels 1 to 24 for T1 and T1ESF. Note: The number of Satellite bearer channels is data rate dependent. The number of Channels = DR/64KBPS. When the Satellite data rate is 64 KBPS there is only one Satellite bearer channel. When the Satellite data rate is 1920 KBPS there are 30 Satellite bearer channels.
SDM-309B Satellite Modem Operation * Range: <1.0E-8 to >1E-3 Swp_Freq - Sweep Monitor** *Range: -25,000 Hz to +25,000 Hz Eb/N0 - Energy(bit)/noise ratio. * Range: <3.2dB to >16.0 dB RxSignal - Receive signal level. * Range: <-60 dBm to >-30 dBm FIL_STAT - Plesiochronous buffer fill status in percent. FRM_ERR/2047_ERR - Framing pattern bit error rate. Monitors the currently selected READ_ERR function. * When the decoder loses lock no data is available and is so indicated.
Operation SDM-309B Satellite Modem 3.2.4.2 Dmd_Flts - Demodulator/Decoder Faults C_Detect RF_Syn Data_Clk I-Channl Q-Channl BER Threshold Module Carrier detect fault. Indicates that the decoder is not locked. Demodulator RF synthesizer fault. Receive data clock activity fault. I channel activity fault. Q channel activity fault. Indicates the set BER threshold has been exceeded. Demodulator/decoder module fault. Typically indicates that the demod/decoder module is missing or will not program. 3.2.4.
SDM-309B Satellite Modem Operation The Modem stores the first ten (Flt0 - 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. All stored faults may be cleared by executing the “CLEAR ?? StFaults” command from the ‘stFaults” level. Stored faults are not maintained through a controller power on reset cycle.
Operation SDM-309B Satellite Modem Time Time of day set/display function. Date The current time that the modem is set for is displayed when selected. To set the modem time press the “ENTER” key and use the right and left arrow keys to position the flashing cursor over the parameter to be changed. Use the up and down arrow keys to change the parameter to the desired value. Once the parameters are displayed as desired press the “ENTER” key to set the time. Date set/display.
SDM-309B Satellite Modem Filter Adjust Assign TX_Fltrs Operation This is a factory setting and the operator is not allowed to enter this parameter without authorization from EFData service department. Failure to comply will result in a modem failure. 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.
Operation SDM-309B Satellite Modem Figure 3-12 Menu Tree 3–40 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Operation Figure 3-13 Menu Tree MN/U-SDM309B Rev.
Operation SDM-309B Satellite Modem Figure 3-14 Menu Tree 3–42 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Operation Figure 3-15 Menu Tree MN/U-SDM309B Rev.
Operation SDM-309B Satellite Modem Figure 3-16 Menu Tree 3–44 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Operation Figure 3-17 Menu Tree MN/U-SDM309B Rev.
Operation 3–46 SDM-309B Satellite Modem MN/U-SDM309B Rev.
Chapter 4. M&C AND INTERFACES 4.1 Monitor And Control 4.1.1 General The Modem uses a sophisticated microcontroller module to perform the monitor and control functions of the modem. This module is referred to as the Monitor & Control (M&C) (Figure 4-1). The M&C monitors the modem and provides configuration updates to other modules within the modem when necessary. Modem configuration parameters are maintained in battery backed RAM which provides for total recovery after a power down situation.
M&C and Interfaces SDM-309B Satellite Modem RS-232C Configuration: To configure the M&C for RS-232C operation. Install jumpers JP4, JP5 and JPX. Remove jumpers JP1, JP2, and JP3. Connect JP7 to RS232 4-4–2 MN/U-SDM309B Rev.
SDM-309B Satellite Modem M&C and Interfaces Figure 4-1 Monitor & Control Card MN/U-SDM309B Rev.
M&C and Interfaces SDM-309B Satellite Modem 4.1.2.2 Remote Baud Rate The remote communications baud rate and parity is programmed by a switch pack (SP1) on the M&C module. Programming the baud rate and parity is accomplished by setting the switches. The switches are individually set in the OFF or ON positions. A switch is programmed “OFF” by placing it in the position furthest away from the PCB (open). “ON” is programmed by placing the switch in the position nearer the PCB.
SDM-309B Satellite Modem M&C and Interfaces 2. If the battery backed RAM failed the valid data test the modulator, demodulator, and interface modules would be tested to determine if valid configuration information was retained by them. If valid configuration information was retained by a module, that module’s configuration will be stored in the battery backed RAM and maintained from that point on. 3.
M&C and Interfaces SDM-309B Satellite Modem INTF_LBk Coding TX_2047 TXD_Flt RXD_Flt Buf_Size Read_ERR Dscrmblr Scramblr Interface Loop Back [OFF] [AMI] [OFF] [NONE] [NONE] [384] [FRAME] Descrambler [ON] Scrambler [ON] 4.1.2.8 Utility Defaults POW ADJ OP MODE Fast_ACQ Power Adjust [-5.0 dBm] Operation Mode [Duplex] Fast Acquisition [OFF] Note: If Battery backed RAM fails the valid data test time and date are set as follows: Date Time 7/4/76 12:00AM 4.1.
SDM-309B Satellite Modem M&C and Interfaces 4.2.1 IBS/M1200P Interface 4.2.1.1 Functional Description The IBS Interface module (Figure 4-2) consists of two PWB’s that are married together. The two assembly numbers are AS/1010 and AS/1011. Figure 4-3 is a block diagram of the IBS/M1200P Channel Unit. Figure 4-4 is a fault and alarm tree designed to explain the fault and alarm reporting matrix that is designed in the IBS/M1200P Channel Unit. Refer to Section 3.1.6 (Faults) and Section 3.1.
M&C and Interfaces SDM-309B Satellite Modem reference clock generated in the modem. The interface will automatically select the internal clock if it detects a problem with the customer selected clock. A fault will be signaled if this happens. 4-4–8 MN/U-SDM309B Rev.
SDM-309B Satellite Modem M&C and Interfaces Figure 4-2 IBS Interface Module MN/U-SDM309B Rev.
M&C and Interfaces SDM-309B Satellite Modem Figure 4-3 IBS Interface Block Diagram 4-4–10 MN/U-SDM309B Rev.
SDM-309B Satellite Modem M&C and Interfaces Figure 4-4 IBS Fault Tree MN/U-SDM309B Rev.
M&C and Interfaces SDM-309B Satellite Modem Figure 4-5 Jumper Table 4-4–12 MN/U-SDM309B Rev.
SDM-309B Satellite Modem M&C and Interfaces The transmit data will be replaced with an all ones pattern (Alarm Indication Signal or AIS) in the event of certain failures, per IESS-309. The modem will transparently pass an incoming AIS signal but can signal that this is happening if interrogated from the front panel or remotely through the M&C Interface. As a test mode the transmit data can be replaced with a 2047 pattern. Selecting this overrides AIS.
M&C and Interfaces SDM-309B Satellite Modem activity on either the TX Terrestrial clock or the external clock (if selected) will substitute Satellite clock and a fault will be signaled. 4.2.1.6 Engineering Service Channel (ESC) The engineering service channel (ESC) is fully compliant with IESS 309 Rev. 2 for serial Data Rates as defined in Section 2.1. It generates overhead at a rate of 1/15 times the data rate which is multiplexed with the customer data to achieve the output data rates.
SDM-309B Satellite Modem TERRESTRIAL TX DATA ENGINEERING SERVICE CHANNEL RS-422/V.35 RECEIVE TIMING RS-422/V.35 TRANSMIT TIMING RS422/V.35 TERMINAL TIMING RS422 TRANSMIT OCTET RS422 RECEIVE OCTET RS422/V.35 REQUEST TO SEND V.35 DATA SET READY RS422/V.35 CLEAR TO SEND RS422/V.35 DATA SET READY RS422/V.
M&C and Interfaces SDM-309B Satellite Modem RS-232 Specification Circuit Supported RD, TD, DSR, RTS, CTS Amplitude (RD, RTS) True: 14 V ± 11 V False: -14 V ± 11 V Amplitude (TD, DSR, CTS) True: 11 V ± 2 V False: -11 V ± 2 V Impedance 5000 ± 2000 ! <2500pF Baud Rate Max: 1/2000 times the data rate (Refer to Section 2.1.
SDM-309B Satellite Modem M&C and Interfaces 4.2.1.9 IBS Interface Breakout Panel The IBS Breakout Panel supports the use of the SDM-309 modem with an IBS/M1200P Channel Unit. Connections between the breakout panel and other equipment are made through front and rear panel connectors. These connectors are listed in Table 4-1. The location of these connectors are shown in Figure 4-6. Figure 4-7 shows the schematic diagram for the IBS Interface Breakout panel.
M&C and Interfaces SDM-309B Satellite Modem Figure 4-6 IBS Break-Out Panel 4-4–18 MN/U-SDM309B Rev.
SDM-309B Satellite Modem M&C and Interfaces 4.2.1.9.1 IBS Terrestrial Interface (J1) The IBS terrestrial interface is provided on a 50 pin female "D" connector accessible from the rear of the breakout panel. Screw locks are provided for mechanical security of the mating connector.
M&C and Interfaces SDM-309B Satellite Modem GROUND TX OCTET SEND DATA SEND TIMING RECEIVE DATA RECEIVER TIMING EXTERNAL CLOCK REQUEST TO SEND CLEAR TO SEND TERMINAL TIMING RX OCTET RECEIVER READY DATA MODE GND TXO-A TXO-B SD-A SD-B ST-A ST-B RD-A RD-B RT-A RT-B EXC-A EXC-B RTS-A RST-B CTS-A CTS-B TT-A TT-B RXO-A RXO-B RR-A RR-B DM-A DM-B 1, 19, 20, 37 3 21 4 22 5 23 6 24 8 26 15 33 7 25 9 27 17 35 16 34 13 31 11 29 4.2.1.9.3 V.35 Interface (J3) The V.
SDM-309B Satellite Modem M&C and Interfaces The engineering service channel is provided on a 25 pin “D” female connector assessable from the front panel of the breakout panel. Screw locks are provided for mechanical security of the mating connector. Signal Function GROUND TRANSMIT DATA RECEIVE DATA REQUEST TO SEND/CLEAR TO SEND TERRESTRIAL ESC DATA SET READY Name GND TXD RXD RTS/CTS TER_ESC_DSR Pin Number 1, 7 2 3 4 5 6 Note: RTS and CTS are looped together on the connector. 4.2.1.9.5 G.
M&C and Interfaces SDM-309B Satellite Modem 4.2.1.9.8 Receive Data (J8) This connector is the interface for the unbalanced Receive Data input. To activate this connector SW3 must be in the UNBAL position. If the balanced Send Data input is to be used, SW3 must be in the BAL position. Switch 3 is located on the front panel to the right of the receive data input. 4.2.1.9.9 Alarm Outputs (TB1) The alarm outputs are provided on a 8 position terminal block located on the front panel of the breakout panel.
SDM-309B Satellite Modem M&C and Interfaces Figure 4-7 IBS Interface Breakout Panel Schematic Diagram MN/U-SDM309B Rev.
M&C and Interfaces SDM-309B Satellite Modem 4.2.2 Drop & Insert Interface 4.2.2.1 Functional Description The IDR Drop & Insert Interface module (Figure 4-8) consists of two PWBs that are married together. The two assembly numbers are AS/1010 and AS/1455. Figure 4-9 is a block diagram of the Drop & Insert Channel Unit. Figure 4-10 is a fault and alarm tree designed to explain the fault and alarm reporting matrix that is designed in the IDR/M1200P Channel Unit. Refer to Section 3.1.
SDM-309B Satellite Modem M&C and Interfaces 4.2.2.2 Data Interface The module contains transformer balanced data interfaces supporting CCITT G.703 parameters, (compatible with AT&T DSI service) and de-jitter. Data inputs are named Drop Send Data Input A and B (DSD-A and DSD-B) and Insert Send Data Input A and B (ISD-A and ISD-B). Outputs are Drop Receive Data Output A and B (DRD-A and DRDB) and Insert Receive Data Output A and B (IRD-A and IRD-B).
M&C and Interfaces SDM-309B Satellite Modem indicated by interrogating the modem and by a green Light Emitting Diode (LED) on the Interface, and is fed into the receive fault tree per IESS-308. Under certain fault conditions defined by IESS-308 the receive user data will be replaced by an all ones pattern. A fault will be signaled when this occurs. 4.2.2.5 Plesiochronous Buffer User data from the Demux Section is fed into a Plesiochronous buffer.
SDM-309B Satellite Modem M&C and Interfaces of the events which cause a secondary alarm. The modem may be interrogated from the front panel or using the RS-485 or RS-232 interface to identify the cause of the alarm. MN/U-SDM309B Rev.
M&C and Interfaces SDM-309B Satellite Modem Figure 4-8 Drop and Insert Channel Unit 4-4–28 MN/U-SDM309B Rev.
SDM-309B Satellite Modem M&C and Interfaces Figure 4-9 Drop and Insert Block Diagram MN/U-SDM309B Rev.
M&C and Interfaces SDM-309B Satellite Modem Figure 4-10 Drop & Insert Fault Tree 4-4–30 MN/U-SDM309B Rev.
SDM-309B Satellite Modem M&C and Interfaces Figure 4-11 Drop & Insert Jumper Table MN/U-SDM309B Rev.
M&C and Interfaces SDM-309B Satellite Modem 4.2.2.8 Drop & Insert Interface Connector Pinouts The D&I 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.
SDM-309B Satellite Modem Satellite Data Rates Supported Satellite Overhead Rate Drop Time Slot Selection (Time Slot 0 not allowed) Insert Time Slot Selection (Time Slot 0 not allowed) Interface Type Data Rate Pulse Width SD Amplitude RD Amplitude Pulse Mask Line Code Jitter Attenuation Transmit Clock Reference Plesiochronous Buffer Buffer Clock Reference Buffer Depth T1, T1_ESF, E1_CCS, E1_IBS, E1_31_TS E1_CAS T1_IBS Depth Status Buffer Centering Overflows/Underflows ESC Data Interface Type ESC Data Ra
M&C and Interfaces SDM-309B Satellite Modem 4.2.2.10 Drop & Insert Breakout Panel The Drop and Insert Breakout Panel supports the use of the drop and insert channel unit in the SDM-309 modem. Connections between the breakout panel and other equipment are made through front and rear panel connectors. These connectors are listed in Table 42. The location of these connectors are shown in Figure 4-12. Table 4-2 Breakout Panel Connectors Ref Desig.
SDM-309B Satellite Modem M&C and Interfaces Figure 4-12 Drop and Insert Break-Out Panel MN/U-SDM309B Rev.
M&C and Interfaces SDM-309B Satellite Modem 4.2.2.10.1 Drop Data Input, Insert Data Output, and Ext. Ref Clk (J1) The Drop Data Input, Insert Data Output, and External Reference Clock balanced signals are provided on a 15 pin “D” female connector accessible from the front of the break-out panel. Screw locks are provided for mechanical security of the mating connector.
SDM-309B Satellite Modem M&C and Interfaces Note: The balanced insert data input signals on J3 are selected by SW2. Refer to Section 4.2.2.11.3 for further balanced insert data signal selection information. 4.2.2.10.4 Insert Data Output (J4) The balanced Insert Data Output is provided on a 15 pin female "D" connector and is located on the front of the break-out panel. Screw locks are provided for mechanical security of the mating connector.
M&C and Interfaces SDM-309B Satellite Modem This connector is the interface for the unbalanced external reference clock input. The unbalanced external reference clock signal on J9 is selected by SW3. Refer to Section 4.2.2.11.5 for further information on selection of the balanced or unbalanced external reference clock signal. 4.2.2.10.10 ESC Channel (J10) The ESC channel interface is provided on a 25 pin “D” female connector and is located on the front of the breakout panel.
SDM-309B Satellite Modem DROP DATA OUTPUT TERRESTRIAL TX DATA TERRESTRIAL RX DATA INSERT DATA INPUT PRIMARY COMMON PRIMARY NORMALLY OPEN PRIMARY NORMALLY CLOSED SECONDARY COMMON SECONDARY NORMALLY OPEN SECONDARY NORMALLY CLOSED DATA SET READY M&C and Interfaces DDO-A DDO-B TER_TXDAT TER_RXDAT IDI-A IDI-B PRI_COM PRI_NO PRI_NC SEC_COM SEC_NO SEC_NC DSR 37 38 5 7 39 40 10 43 27 11 44 28 48 4.2.2.
M&C and Interfaces SDM-309B Satellite Modem 4.2.2.11.4 Insert Data Output The insert data output signal has two outputs. The BNC connector has the unbalanced output signal and the DB15 connector has the balanced output signal. To use the BNC connector output, SW2 position 5 & 6 must be closed (close to PCB) and SW2 position 7 & 8 must be open (away from PCB). To use the DB15 connector output, SW2 position 5 & 6 must be open and SW2 position 7 & 8 must be closed. 4.2.2.11.
SDM-309B Satellite Modem M&C and Interfaces Figure 4-13 Rear Panel Switch Diagram MN/U-SDM309B Rev.
M&C and Interfaces SDM-309B Satellite Modem Table 4-3 Switch 1 Switch Position -1UNBALANCED DDI BALANCED DDI -5UNBALANCED DDO BALANCED DDO -1UNBALANCED IDI BALANCED IDI -5UNBALANCED IDO BALANCED IDO -1UNBALANCED EXC BALANCED EXC LOOPBACK NORMAL DCE DTE 4-4–42 -2- -3CLOSED OPEN Switch Position -6-7CLOSED CLOSED OPEN OPEN Switch 2 Switch Position -2-3CLOSED CLOSED OPEN OPEN Switch Position -6-7CLOSED CLOSED OPEN OPEN Switch 3 Switch Position -2-3CLOSED OPEN OPEN CLOSED Switch 4 Drop Data Output/Inser
SDM-309B Satellite Modem M&C and Interfaces Figure 4-14 Drop and Insert Schematic Diagram MN/U-SDM309B Rev.
M&C and Interfaces SDM-309B Satellite Modem Figure 4-15 Drop & Insert Daughter Board Schematic Diagram 4-4–44 MN/U-SDM309B Rev.
SDM-309B Satellite Modem M&C and Interfaces 4.2.3 External Channel Unit Interface Refer to Appendix C for a complete description of the External Channel Unit Interface and system integration. This is an optional mode of operation, making the SDM-309B modem compatible with a variety of stand alone channel unit equipment for IBS service. Please refer to Appendix C for full details. 4.
M&C and Interfaces SDM-309B Satellite Modem TX_CLOCK BUF_CLK RX_CLOCK Modem Settings (Slave) TX_TERR SATELITE NORMAL 4.3.1.2 Master/Slave G.703 * 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 retransmitting. The settings for the Master and Slave modems are the same as listed above. 4.3.1.3 Master/Slave X.21 * Clock must be looped externally at slave end.
SDM-309B Satellite Modem M&C and Interfaces an exact frame length, causing minimum loss of data. By using very high stability clocks, the expected time between slips can be many days. Loss of the buffer clock will mean the buffer will not be emptied and no data will be available. The buffer clock will normally revert to the low stability internal reference automatically. 4.3.2.1 Master/Master (Customer Clock) TX_CLOCK BUFF_CLK RX_CLK EXT_REF Modem Settings (Master) TX_TERR TX_TERR NORMAL N/A 4.3.2.
Chapter 5. THEORY OF OPERATION 5.1 Modulator 5.1.1 General description The modem Modulator card is a 10.25" x 14" card (Figure 5-1) that fits in the top left slot of the modem chassis. Its function is to create a QPSK modulated carrier within the 50 - 90 MHz or 100 - 180 MHz range from the digital data stream that is provided by the Interface card. Several subSections make up the card.
Theory of Operation SDM-309B Satellite Modem Spurious and Harmonics Output Power Level Range Output Power Adjustment Output Stability Output Impedance Output Return Loss Differential Encoding FEC Encoding I/O Connector 5-5–2 -50 dBc minimum in band, 40 dBc minimum out of band -5 to-30 dBm 0.5 dB Step Size ± .5 dB over -5 to -25 dBm ±1 dB over -25 to -30 dBm 75 ! (50 Optional) 20 dB Minimum 2 Phase or None Convolutional - Rate 7/8, 3/4, or 1/2 DIN - 96 pin MN/U-SDM309B Rev.
SDM-309B Satellite Modem Theory of Operation Figure 5-1 Modulator Card MN/U-SDM309B Rev.
Theory of Operation SDM-309B Satellite Modem Figure 5-2 Modulator Block Diagram 5-5–4 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Theory of Operation Figure 5-3 Modulator Output Spectral Occupancy MN/U-SDM309B Rev.
Theory of Operation SDM-309B Satellite Modem 5.1.3 Theory of Operation As mentioned in Section 5.1.1, the modulator is composed of eight basic subSections. SubSections 1-4 and 8 make up the baseband processing portion of the modulator while subSections 5-7 form the RF portion of the modulator. Data that is to be transmitted is input to the Digital Interface (1) 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.
SDM-309B Satellite Modem Theory of Operation module. It contains circuitry which provides programmable control of the output level over a 10 dB range in .5 dB Steps and power leveling to maintain the stability of the output level over time and temperature. 5.2 Viterbi Decoder / Demodulator Processor 5.2.1 General Description The modem Viterbi Decoder/Demod Processor is a 10.25" x 14" card (Figure 5-4 through Figure 5-6) that fits in the middle left slot of the modem chassis.
Theory of Operation SDM-309B Satellite Modem Clock Phase Error Clock Loop Bandwidth Clock Jitter ± 5% Software Controlled 5% p to p Max 5.2.2.2 Viterbi Decoder Specifications Bit Error Rate Maximum Data Rate Synchronization Time Output Fault Indicators Raw BER Detection Differential Decoding Constant Length I/O Connector 5-5–8 See Figure 5-8 6.4 Mb/s (Rate 1/2) 9.
SDM-309B Satellite Modem Theory of Operation Figure 5-4 Viterbi Decoder (AS/0701) MN/U-SDM309B Rev.
Theory of Operation SDM-309B Satellite Modem Figure 5-5 Viterbi Decoder (AS/0949) 5-5–10 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Theory of Operation Figure 5-6 Viterbi Decoder (AS/2133) MN/U-SDM309B Rev.
Theory of Operation SDM-309B Satellite Modem Figure 5-7 Viterbi Decoder Block Diagram 5-5–12 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Theory of Operation Figure 5-8 Typical Decoder BER Performance MN/U-SDM309B Rev.
Theory of Operation SDM-309B Satellite Modem 5.2.3 Theory Of Operation 5.2.3.1 Demod Processor The Demod Processor, in conjunction with the Demodulator, reconstructs the digital data stream that was transmitted but corrupted by transmission channel impairments. The Demod Processor accepts 11 bit quantized signals from the Demodulator for both the I and Q channels.
SDM-309B Satellite Modem Theory of Operation 7/8 rate. The "de-puncture" pattern is the same as the "puncture pattern used in the encoder. A set of "branch metric" values is then computed for each of the received symbol pairs, related to the probability that the received symbol pair was actually transmitted as one of the four possible symbol pairs. The "branch metrics" are then processed by the add-select-compare (ASC) computer.
Theory of Operation SDM-309B Satellite Modem 5.3.2 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 5-5–16 QPSK 50 to 90 MHz or 100 to 180 MHz Synthesized 2.5 KHz .7 Times the Data Rate Divided by the Encoding Rate.
SDM-309B Satellite Modem Theory of Operation Figure 5-9 Demodulator Card MN/U-SDM309B Rev.
Theory of Operation SDM-309B Satellite Modem Figure 5-10 Demodulator Block Diagram 5-5–18 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Theory of Operation 5.3.3 Theory of Operation As mentioned in Section 5.3.1, the Demodulator is composed of six basic subSections. The first three make up the RF portions of the board while the last three handle the baseband processing. A Costas Loop is used for carrier recovery, however the Demodulator board provides only the I and Q channel signals and has a VCXO input. It does not do the costas processing.
Theory of Operation SDM-309B Satellite Modem 5.4.2 Reacquisition Normally the modem sweeps full range of plus/minus 30 KHz during acquisition. The time it takes to complete one full sweep cycle depends upon the symbol rate of the demod as follows: 1. If the demod symbol rate is less than or equal to 112 KBPS the sweep time is: sweep time (in seconds) = 8400/SR (symbol rate in KBPS) 2.
SDM-309B Satellite Modem Theory of Operation 5.4.3 Fast Acquisition When Fast Acquisition is enabled the fast acquisition algorithm is used for acquisition of receive symbol rates of 128 Kbps or lower. If the sweep range is set to less than 50KHz, acquisition will be dictated by the directed sweep specifications and the fast acquisition algorithm will not be used. 5.4.4 Directed Sweep The directed sweep mode was designed to rapidly acquire a carrier of known frequency offset.
Chapter 6. MAINTENANCE 6.1 System Checkout 6.1.1 General The system checkout Section is to be used as an aid in setting up a modem within the earth station. There are tables for use in checking to see if the Eb/N0 is correct, typical output spectrum, and typical eye pattern and constellation pictures. 6.1.2 Modulator Checkout 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.
Maintenance SDM-309B Satellite Modem an Eb/N0 of 7.5 dB. (S+N)/N is measured by taking the average level of the noise and the average level of the top of the modem spectrum as shown. Use this measurement for the first column on Table 6-1. Read across the page to find the S/N and Eb/N0 for the specific code rate. Once the demodulator has locked to the incoming signal the “MONITOR” menu will display signal level, raw BER, corrected BER, and Eb/N0 (Sections 3.1.5. and 3.2.4).
SDM-309B Satellite Modem Maintenance Figure 6-1 Typical Output Spectrum MN/U-SDM309B Rev.
Maintenance SDM-309B Satellite Modem Figure 6-2 Output Spectrum With Noise 6-6–4 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Maintenance Table 6-1 EFDATA Corporation Conversion Of (S+N)/N TO S/N And Eb/N0 For Various Code Rates (dB) Code Rate 1/2 Code Rate 3/4 Code Rate 7/8 (S+N)/N S/N Eb/N0 S/N Eb/N0 S/N Eb/N0 4.0 1.8 1.8 1.8 0.0 1.8 -0.6 4.5 2.6 2.6 2.6 0.8 2.6 0.2 5.0 3.3 3.3 3.3 1.6 3.3 0.9 5.5 4.1 4.1 4.1 2.3 4.1 1.6 6.0 4.7 4.7 4.7 3.0 4.7 2.3 6.5 5.4 5.4 5.4 3.6 5.4 3.0 7.0 6.0 6.0 6.0 4.3 6.0 3.6 7.5 6.6 6.6 6.6 4.9 6.6 4.2 8.0 7.3 7.3 7.3 5.5 7.3 4.8 8.5 7.8 7.8 7.8 6.1 7.8 5.4 9.0 8.4 8.4 8.
Maintenance SDM-309B Satellite Modem Figure 6-3 Typical Eye Patterns 6-6–6 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Maintenance Figure 6-4 Typical Eye Constellations MN/U-SDM309B Rev.
Maintenance SDM-309B Satellite Modem 6.1.4 Test Points The following is a list of front panel test points and a description or the signal that is to be present under normal operation. 6.1.4.1 Modulator (Figure 6-5) TPG1 TP2 TP3 TP4 TPG2 TP6 TP17 TP18 TP19 TPG6 Ground Q EYE Pattern Level is 2 V P-P. The DC offset is 0 V. This signal is the Q input to the QPSK modulator. The eye pattern at this point is not equalized. I EYE Pattern Level is 2 V P-P. The DC offset is 0 V.
SDM-309B Satellite Modem Maintenance 6.1.4.2 Demodulator (Figure 6-6) TP10 TP23 TPG TP1 TP2 TP3 TP4 TP5 TP6 TP7 TP8 VCXO Control Voltage Approximately 0 to +2.5V sweep range. Discriminator Voltage. Nominally +2.5V with 6 dB noise at 128 Kbs. Ground test point Q EYE pattern. Level is 1V P-P at the center of the eye crossing. The DC offset is about +2.4V. Q THRS - Q channel threshold voltage. +2.9V DC. I THRS - I channel threshold voltage. +2.9V DC. I EYE pattern.
Maintenance SDM-309B Satellite Modem 6.1.4.3 Viterbi Decoder/demod Card AS/0701 (Figure 6-7) TP1 TP2 TP3 TP4 TP5 TP6 TPG TP7 TP8 TP9 TP10 TP11 Data Clock. Result of the data clock recovery loop in the demod processor Section. R0C Sign Bit. Result of the hard decision interface. 50% duty cycle random TTL data. R1C Sign Bit. Result of the hard decision interface. 50% duty cycle random TTL data. Symbol Clock. Result of the symbol clock recovery loop in the demod processor Section. Not used at this time.
SDM-309B Satellite Modem Maintenance 6.1.4.4 Viterbi Decoder/Demod Card AS/0949 (Figure 6-8) TPG TP1 TP2 TP3 TPG TP4 TP5 TP6 TP7 TPG Ground Test Point. Decoder Data. Data out of the decoder. Decoder Clock. Clock out of the decoder. Sync Error. Approximate raw error rate. Random TTL pulses. One pulse for every I channel or Q channel error. Ground Test Point. I Channel Data. Result of the hard decision interface. 50% duty cycle random TTL data. Symbol Clock.
Maintenance SDM-309B Satellite Modem 6.1.4.5 Viterbi Decoder/Demod Card AS/2133 (Figure 6-9) TP2 TP3 TP4 TP8 GND Ground Test Point. VIT LOCK Viterbi lock Result of the decoder and clock synchronization and AGC leveling. DATA CLK Data Clock. Result of the data clock recovery loop in the demod processor Section. SYM CLK Symbol Clock. Result of the symbol clock recovery loop in the demod processor Section. Figure 6-9 6-6–12 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Maintenance 6.2 Fault Isolation System faults are reported in the “FAULT” menu (Figure 3-3). Stored faults are reported in the ‘sTFAULTS” menu (Figures 3-4 through 3-6). The following list is to be used in isolating the problem and deciding the appropriate action to be taken. 6.2.1 Modulator Faults Refer to Sections 3.1.6.1, 3.2.5.1, and Figures 3-3 and 3-4 of the O&I manual. Fault RF_SYN DATA_CLK TCLK_SYN I_CHANNL Q_CHANNL AGC_LEVL MN/U-SDM309B Rev.
Maintenance SDM-309B Satellite Modem MODULE Modulator module fault. Indicates a problem in programming the modulator card. Check to see that the modulator card is present and is properly seated. If the modulator card is properly seated this could indicate a problem in the Monitor and Control (M&C) card or in the interface between the modulator and M&C card. Return the defective card for repair. 6.2.2 Demodulator Faults Refer to Sections 3.1.6.2, 3.2.5.2, and Figures 3-3 and 3-5 in the O&I manual.
SDM-309B Satellite Modem Maintenance 6.2.3 Common Equipment Faults Refer to Section 3.1.6.3, 3.2.5.3, and Figures 3-3 and 3-6 in the O&I manual. Fault BATTERY -12 VOLT +12 VOLT +5 VOLT CONTROLR INTRFACE Possible Problem And Action M&C battery voltage fault. 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.
Maintenance SDM-309B Satellite Modem 6.3.1 Transmit Overhead Framing Unit Faults Fault DATA/AIS TX_PLL DROP Clk_Act Possible Problem And Action Data or Incoming Alarm Indication Signal. When AIS (Alarm Indication Signal) is selected the TX_INTF (Transmit Interface) fault “Data/AIS is monitoring a fault condition of all 1’s from customer data input to the modem. When Data_Flt is selected, the TX_INTF fault “Data/AIS is monitoring a fault condition of all 1’s or all 0’s.
SDM-309B Satellite Modem Maintenance FRM_BER BW_ALARM Insert Ins_Clk RX_PLL BUFF_CLK MUX_LOCK Frame Bit Error Rate. The receive decoded error rate has exceeded 10E-3 over a 60 second period, measured on the framing bits. This is defined as a major (prompt) receive alarm by Intelsat Specification IESS-308. In a redundant system a switchover will be attempted. Since some data must be correctly received to indicate this fault, receive AIS will not be substituted.
Maintenance SDM-309B Satellite Modem 144.5 149.5 154.5 159.5 164.5 169.5 174.5 179.5 184.5 189.5 194.5 199.5 204.5 208.5 212.5 216.5 220.5 224.5 228.5 232.5 236.5 240.5 244.5 248.5 252.5 257.0 263.0 270.0 276.8 283.2 290.0 297.0 303.0 310.0 316.8 323.2 330.0 337.0 343.0 350.0 356.8 363.2 370.0 377.0 383.0 390.0 396.8 403.2 410.0 417.0 423.0 430.0 436.8 443.2 450.0 457.0 463.0 470.0 476.8 483.2 490.0 497.0 503.0 6-6–18 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 204.8 209.
SDM-309B Satellite Modem 510.0 518.4 529.6 539.2 548.8 558.4 569.6 579.2 588.8 598.4 609.6 619.2 628.8 638.4 649.6 659.2 668.8 678.4 689.6 699.2 708.8 718.4 729.6 739.2 748.8 758.4 769.6 779.2 788.8 798.4 809.6 820.0 840.0 860.0 880.0 900.0 920.0 940.0 960.0 980.0 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 MN/U-SDM309B Rev. # Maintenance 510.4 520.0 530.0 540.0 550.0 560.0 570.0 580.
Maintenance SDM-309B Satellite Modem 1896.0 1936.0 1976.0 2016.0 1900.0 1940.0 1980.0 2020.0 1904.0 1944.0 1984.0 2024.0 1908.0 1948.0 1988.0 2028.0 1912.0 1952.0 1992.0 2032.0 1916.0 1956.0 1996.0 2036.0 1920.0 1960.0 2000.0 2040.0 1924.0 1964.0 2004.0 2044.0 1928.0 1968.0 2008.0 2048.0 1932.0 1972.0 2012.0 Notes: 1. Programmed variable rates are listed above from 64 Kb/s to 2.048 Mb/s or Single Data Rate option is available. 2. Maximum 1/2 rate is 2048 Kb/s.
SDM-309B Satellite Modem Maintenance Figure 6-10 Rear View Without Cover MN/U-SDM309B Rev.
Maintenance SDM-309B Satellite Modem 6.4 Module Replacement The modem cards are plug-in cards that can be replaced by removing the defective card and reinserting the replacement. There are card ejectors for use in removing the cards. On the interface card there are additional screws on the rear panel that need to be removed before the interface card is removed (refer to Figure 6-10).
SDM-309B Satellite Modem Maintenance Table 6-3 EFData Part Numbers For Various Modules Modulators Base Part Number - AS/0773 OR AS/0773X Dash # Description 2 SDM-308/9, Open network filtering 11 SDM-308/9, Open network filtering, +5 dBm output Demodulators Base Part Number - AS/0778 OR AS/0778X Dash # Description 1 SDM-650, 308, 309, 70/140MHZ, 75 ohm Viterbi Decoders Base Part Number - AS/0701 Dash # Description 1 SDM-308 (IDR) 2 SDM-309 (IBS) Viterbi Decoder Base Part Number - AS/0949 NO DASH NUMBERS Vi
Appendix A. DATA RATES AND FILTERS The SDM-309B modem will operate at data rates from 64 Kbps to 2.048 Mbps with variable rate filters or fixed rate filters. This appendix covers data rate change instructions for fixed rate and variable rate filters in Section 1. It also covers the differences between a fixed rate filter in Section 2, and a variable rate filter in Section 3, and describes the modem configuration for each filter type. 1.0 Data Rate Change Instructions 1.1 Fixed Rate Filters 1.
Data Rates and Filters SDM-309B Satellite Modem 8. With a phillips screwdriver, remove the four (4) screws holding down the daughter card. See Figure A-2 for location of the hardware. 9. Remove the daughter card (0698) from the demodulator. 10. Install the replacement daughter card (0698) so that J1 on the daughter card lines up with J2 on the demodulator card and J2 on the daughter card lines up with J3 on the demodulator card and all four hold down screws line up. See Figure A-2.
SDM-309B Satellite Modem Data Rates and Filters Figure A-1 Modulator Filter Card Change MN/U-SDM309B Rev.
Data Rates and Filters SDM-309B Satellite Modem Figure A-2 Demodulator Filter Card Change A–4 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Data Rates and Filters Figure A-3 Fixed Rate Modulator Filter MN/U-SDM309B Rev.
Data Rates and Filters SDM-309B Satellite Modem Figure A-4 Fixed Rate Demodulator Filter A–6 MN/U-SDM309B Rev.
SDM-309B Satellite Modem Data Rates and Filters Figure A-5 Variable Rate Modulator Filter MN/U-SDM309B Rev.
Data Rates and Filters SDM-309B Satellite Modem Figure A-6 Variable Rate Demodulator Filter A–8 MN/U-SDM309B Rev.
SDM-309B Satellite Modem MN/U-SDM309B Rev.
Appendix B. SATELLITE MODEM REMOTE CONTROL 1.0 Scope This document defines the protocol and command structure for remote control and status monitoring of the EFData SDM308-5 satellite modem. Firmware FW/0713-60E, version 6.05. 2.0 General Remote control and status information is transferred via a RS-485 (optional RS-232C) serial communications link. Commands and data are transfered on the remote control communications link as US ASCII encoded character strings.
Remote Control SDM-309B Satellite Modem 3.1 Start Character A single character precedes all messages transmit on the remote link. This character flags the start of a messege. This character is: ! ! “<“ for commands and “>“ for responses. 3.2 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 0 to 255.
SDM-309B Satellite Modem Remote Control Each message is ended with a single character which signals the end of message. This characters is: ! ! “cr” “]” (carriage return character) for commands. (end bracket) for responses. 4.0 Configuration Commands/Responses 4.1 Modulator Configuration Commands 4.1.1 Set Modulator Frequency (to nnn.nnnn MHZ, nnn.nnnn = 50.000090.0000) Command: Response: add/MF_nnn.
Remote Control SDM-309B Satellite Modem the standard ‘sMRx_" commands. Modems that have the variable rate option installed will also respond to the special ‘sMRV_" command. 4.1.3.1 Modulator Filter Rate Assignment Command: add/AMRx_nnn_mmmm.m”cr””lf”] Status Only: Response: add/AMRx_nnn_mmmm.m”cr””lf”] Note: The parameters nnn_mmmm.
SDM-309B Satellite Modem Remote Control 4.1.4 Set Modulator Power Offset Command: Response: add/MPO_snn.n”cr””lf”] snn.n = +20.0 to -20.0 in 0.5dB increments. Note: This will be the highet modulator power that will be displayed and programmed. Use the MOP_ command to actually change the modulator output power. Status Only: Response: add/MPO_snn.n”cr””lf”] 4.1.5 Set Modulator Output Power Level Command: Response: add/MOP_snn.n”cr””lf”] snn.
Remote Control SDM-309B Satellite Modem Status Only: Response: add/DF_nn.nnnn”cr””lf”] 4.2.2 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).
SDM-309B Satellite Modem Remote Control 4.2.2.3 Select Demodulator Rate Variable *Variable Rate Option Only* Command: add/SDRV_nnn_mmmm.m”cr””lf”] Status Only: see DR command. 4.2.3 Differential Decoder Enable Command: Response: add/DDEC_xxx”cr”lf”] Status Only: Response: add/DDEC_xxx”cr”lf”] (xxx = ON or OFF) 4.2.
Remote Control SDM-309B Satellite Modem 4.2.7 Sweep Reacquisition This command is used to specify time duration of the reacquisition mode. The sweep is reduced to plus/minus 2500Hz 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”] (xxx = 0 to 999 number of seconds) 4.2.
SDM-309B Satellite Modem Status Only: Response: Remote Control add/SCF_xnnnnn”cr””lf”] (x = + or - sweep offset direction). (nnnnn = 0 to 25000. *Note: This command is only valid when fast acquisition is enabled. See the "FAM_" command definition. 4.2.10 Sweep Width Range This command sets the overall travel of the sweep during acquisition. The sweep width may be set in the range of 0Hz to 50000Hz.
Remote Control SDM-309B Satellite Modem 4.3.2 External Reference Frequency Command: Response: add/ERF_nnnnn”cr””lf”] nnnnn = 8 to 99992 (external reference frequency in KHz, must be a a multiple of 8KHz). Status Only: Response: add/ERF_nnnnn”cr””lf”] 4.3.3 Interface Loop-back (ON/OFF) Command: Response: add/ILB_xxx”cr””lf”] Status Only: Response: add/ILB_xxx”cr””lf”] (xxx = ON or OFF) 4.3.
SDM-309B Satellite Modem Remote Control 4.3.8 Descramble Enable (ON/OFF) Command: Response: add/DE_xxx”cr””lf”] Status Only: Response: add/DE_xxx”cr””lf”] (xxx = ON or OFF) 4.3.9 Interface Substitute Pattern (Transmit 2047 Pattern) Command: Response: add/ISP_xxx”cr””lf”] Status Only: Response: add/ISP_xxx”cr””lf”] (xxx = ON or OFF) 4.3.
Remote Control SDM-309B Satellite Modem 4.3.13 Transmit Data Fault Command: Response: add/TDF_xxxx”cr””lf”] xxxx = NONE, DATA, or AIS (transmit data fault flagged on transmit data loss, AIS from terrestrial interface or none flagged). Status Only: Response: add/TDF_xxxx”cr””lf”] 4.3.
SDM-309B Satellite Modem Remote Control cc = 1 to 31 (terrestrial time slot number for E1 data formats). Status Only: Response: add/DCA_dd;cc”cr””lf”] Note: This command is not valid if the drop data format is specified to be T1IBS or E1IBS. Also this command is not valid when the drop data format is specified as E1CAS and the modulator data rate is set to 1920.0Kbps. 4.3.18 Bulk Drop Channels Assignment Command: Response:
Remote Control SDM-309B Satellite Modem 4.3.20 Bulk Insert Channels Assignment Command: Response: add/BICA_ii;cc_ii;cc_ii;cc_ii;cc......”cr””lf”] ii = 1 to N, (over the satellite insert channel) where N = (Modulator Data Rate) divided by (64Kbps). cc = 1 to 24 (terrestrial channel number for T1 data formats). cc = 1 to 31 (terrestrial time slot number for E1 data formats). cc = 0 if no insert is desired for the specified insert channel.
SDM-309B Satellite Modem 4.4.3 Remote Remote Control Configures the MODEM for remote operation. The SDM308-5 will respond to any status request at any time. However, the SDM308-5 must be in “Remote Mode” to change configuration parameters. Command: Response: add/REM_”cr””lf”] 4.4.4 Clear Stored Faults This command is used to clear all stored faults logged by the SDM308-5. Command: Response: add/CLSF_”cr””lf”] 4.4.
Remote Control SDM-309B Satellite Modem AMRA_nnn_mmmm.m”cr” AMRB_nnn_mmmm.m”cr” AMRC_nnn_mmmm.m”cr” AMRD_nnn_mmmm.m”cr” COM_xxx”cr” DENC_xxx”cr” AMRV_nnn.mmmm.m”cr””lf”] filter “A” assignment filter “B” assignment filter “C” assignment filter “D” assignment Carrier Only Mode (ON/OFF) Differential Encoder (ON/OFF) modulator variable rate assignment *(variable rate option only)* 5.1.
SDM-309B Satellite Modem SD_s”cr” FAM_xxx”cr” ADRV_nnn.mmmm.m”cr””lf”] Remote Control *Sweep Direction Fast Acquisition Mode demodulator variable rate assignment (variable rate option only)* *Note: ‘sCF_", ‘sWR_", and ‘sD_" responses are returned only when fast acquisition is enabled. See the "FAM_" command definition. 5.1.4 Demodulator/Decoder Configuration Program Status This command is used by the SMS658 M:N protection switch to collect information that is necessary to configure back-up modems.
Remote Control SDM-309B Satellite Modem ICFR_xxxx”cr” Coding Format Receive (AMI/HDB3/B8ZS) ISP_xxx”cr” Substitution Pattern (ON/OFF) TDF_xxxx”cr” Transmit Data Fault (NONE/DATA/AIS) RDF_xxxx”cr” Receive Data Fault (NONE/DATA/AIS) IBS_nnnnnn”cr” Interface Buffer Size IRE_xxxx”cr” Interface Read Error Select (FRM/2047) DE_xxx”cr” Descrambler Enable (ON/OFF) SE_xxx”cr” Scrambler Enable (ON/OFF) DDF_xxxxxx”cr” Drop Data Format BDCA_dd;cc_dd;cc...
SDM-309B Satellite Modem SYN_xxx”cr” ICH_xxx”cr” QCH_xxx”cr” BCLK_xxx”cr” BERT_xxx”cr” RSL_-nn.ndBm”cr” CSV_snnnnn”cr” SFLT_xx”cr””lf”] Remote Control Synthesizer lock (OK/FLT) I-channel (OK/FLT) Q-channel (OK/FLT) bit clock (OK/FLT) BER threshold (OK/FLT) Receive Signal Level (level or No Data) Current Sweep Value Number of stored faults logged (0 to 10) 5.
Remote Control SDM-309B Satellite Modem 5.8 Bit Error Rate Status 5.8.1 Raw BER Command: Response: add/RBER_nnnnE-4”cr””lf”] nnnn = RBER or nnnn = <1.0 (lower limit) Example: Request Raw BER from modem 123. Command: Response: <123/RBER_”cr” >123/RBER_152E-4”cr””lf”] RBER = .0152 errors/bit *Note: "No Data" is returned if no carrier is detected (decoder not locked). 5.8.
SDM-309B Satellite Modem Remote Control 2. Data delimited by a comma (“,”) will be returned for all time intervals logged. 3. The optional data modifiers “>“ and “<“ are only present if the error rate exceeds the computational resolution of the system. Examples: No Data - >add/CBEL_1.0”cr””lf”] Momentary lock in 32 time intervals >add/CBEL_1.0;,,,,,,,0203,<0108,<0108,<0108,,,,,,,,,,,,,,,,,,,,,”cr””lf ”] 5.9 Eb/N0 Status The Eb/N0 status command causes the Eb/N0 ratio to be returned.
Remote Control SDM-309B Satellite Modem 5.12 Receive Signal Level Status Command: Response: add/RSL_-nn.ndBm”cr””lf”] 5.13 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”] s = + or - (sweep offset direction). nnnnn = 0 to 25000. xxx = OK or FLT (decoder lock status OK or FAULT). 5.14 Interface Read Error Status This command returns frame or 2047 error rate.
SDM-309B Satellite Modem “#” hh mm ss MM DD YY MN/U-SDM309B Rev. # Remote Control Fault number (0 - 9), “0” is the first fault stored. Hours in twenty four hour format. Minutes. Seconds. Month. Day Year.
Remote Control SDM-309B Satellite Modem 5.16.1 Modulator Stored Faults Command: add/MSF_# hh:mm:ss MOD_xxx”cr” AGC_xxx”cr” SYN_xxx”cr” BCLK_xxx”cr” TCLK_xxx”cr” ICH_xxx”cr” QCH_xxx”cr””lf”] MM/DD/YY”cr” Module missing or won”t program (OK/FLT) AGC leveled (OK/FLT) Carrier synthesizer (OK/FLT) Bit clock (OK/FLT) Transmit clock (OK/FLT) I-channel (OK/FLT) Q-channel (OK/FLT) 5.16.
SDM-309B Satellite Modem Remote Control INS_xxx”cr” BWA_xxx”cr” BER_xxx”cr” RXD_xxx”cr” OVFL_xxx”cr” UNFL_xxx”cr””lf”] Insert (OK/FLT) Receive Backward Alarm (OK/FLT) Frame BER (OK/FLT) Receive Data Loss/AIS (OK/FLT) Buffer Overflow (OK/FLT) Buffer Underflow (OK/FLT) 5.17 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.
Remote Control SDM-309B Satellite Modem Parameter 17 (p17): RF loop-back ON/OFF. p17 = n, where “n” is “0” to indicate off or “1” to indicate on. Parameter 18 (p18): Differential decoder enable ON/OFF. p18 = n, where “n” is “0” to indicate off or “1” to indicate on. Parameter 19 (p19): BER threshold. p19 = nnnn, where “nnnn” is the currently programmed BER threshold in the same format as the single command “BERT_”. Parameter 20 (p20): Sweep Reacquisition.
SDM-309B Satellite Modem Remote Control 5.18 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”] Character “a”: Modulator fault status character 1. Bit 6 = 1 always. Bit 5 = Modulator fault.
Remote Control SDM-309B Satellite Modem Bit 3 through Bit 0 = Binary representation (0 - 10) of the number of common equipment stored faults. Character “f”: Common equipment fault status character 2. Bit 6 = 1 always. Bit 5 = Battery fault. Bit 4 = +5 volt fault. Bit 3 = +12 volt fault. Bit 2 = -12 volt fault. Bit 1 = not used. Bit 0 = not used. Character “g”: Interface transmit side faults character 1. Bit 6 = 1 always. Bit 5 = not used. Bit 4 = not used.
SDM-309B Satellite Modem Remote Control 5.19 Bulk Consolidated Anolog Status This command is similar to the “BCS_” command but, returns MODEM anolog 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.
Remote Control SDM-309B Satellite Modem Where x.xx is the software version number. B-B–30 MN/U-SDM309B Rev.
Appendix C. EXTERNAL CHANNEL UNIT 1.1 General The following Appendix is an aide in interconnecting the SDM-309B modem with the Multipoint M1200 channel unit for IBS service. The interface options are described in Section 2. Figure C-1 is a block diagram of a satellite communications system using an external channel unit with the SDM-309B modem. 1.
External Channel Unit SDM-309B Satellite Modem molex connector on the cable between the modem and the channel unit. The following drawings (Figure C-2 through C-8) are attached for reference. C-C–2 MN/U-SDM309B Rev.
SDM-309B Satellite Modem External Channel Unit Figure C-1 Satellite Communications System With External Channel Unit MN/U-SDM309B Rev.
External Channel Unit SDM-309B Satellite Modem Figure C-2 System Interconnect Diagram C-C–4 MN/U-SDM309B Rev.
SDM-309B Satellite Modem External Channel Unit Figure C-3 Adapter Cable AS/0749 (V.35) MN/U-SDM309B Rev.
External Channel Unit SDM-309B Satellite Modem Figure C-4 Adapter Cable AS/0750 (V.35) C-C–6 MN/U-SDM309B Rev.
SDM-309B Satellite Modem External Channel Unit Figure C-5 Adapter Cable AS/0751 (RS449) MN/U-SDM309B Rev.
External Channel Unit SDM-309B Satellite Modem Figure C-6 Adapter Cable AS/0752 (15 Pin “D”) C-C–8 MN/U-SDM309B Rev.
SDM-309B Satellite Modem External Channel Unit Figure C-7 Adapter Cable AS/0741 (RS449) MN/U-SDM309B Rev.
External Channel Unit SDM-309B Satellite Modem Figure C-8 Adapter Cable AS/0753 (15 Pin “D”) C-C–10 MN/U-SDM309B Rev.
SDM-309B Satellite Modem External Channel Unit 2.0 Digital Interfaces 2.1 RS422 & MIL-STD-188-114 Interface 2.1.1 Functional Description The RS422 and MIL-STD-188-114 digital interface (Figure C-9) provides the level translation, buffering and termination between the internal modem signals and the RS422 or MIL-STD-188-114 interface on the rear panel. Electrical characteristics of the RS422 interface signals are defined in EIA STD RS422.
External Channel Unit SDM-309B Satellite Modem The RS422 and 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. From the modem side, the received data and recovered clock are routed back to the modulator input for retransmission. Loop timing is supported by the selection of jumper JP10.
SDM-309B Satellite Modem External Channel Unit Figure C-9 RS422 & MIL-STD-188-114 Interface MN/U-SDM309B Rev.
External Channel Unit SDM-309B Satellite Modem Figure C-10 RS422 & MIL-STD-188-114 Block Diagram C-C–14 MN/U-SDM309B Rev.
SDM-309B Satellite Modem External Channel Unit Table C-1 AS/0627-3 Rev E Board Jumper Selection JP1 TX Clock Select Normal Invert Auto* JP2 Interface Select V.35 (-2) Mil-188/RS232 (-3)* JP3 RX Data Normal* Buffer JP8 RX Clock Normal* Buffer JP4 Address Set 0* JP5 Address Set 0* JP6 Address Set 1* JP7 Address Set 1* MIL (-3) JP9 CTS to RTS V.35 (Processor controller for V.
External Channel Unit SDM-309B Satellite Modem 2.1.2 Connector Pinouts The RS422 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 and latching blocks are provided for mechanical security of the mating connector.
SDM-309B Satellite Modem External Channel Unit 2.2 V.35 Interface 2.2.1 Functional Description The V.35 digital interface (Figure C-11) provides level translation, buffering and termination between the internal modem signals and the V.35 DCE interface 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 Sections 2.2.2 and 2.2.3.
External Channel Unit SDM-309B Satellite Modem front edge of the card. The JP10 REM setting is used when loop timing is supported by software on the M&C and will be included in the front panel menu. Three fault outputs are provided on dry contact Form C relays. These are the COMMON EQUIPMENT, MODULATOR, and DEMODULATOR faults. They are available on the FAULT connector on the modem rear panel. Generation of these fault conditions is described in Section 3.1.5.
SDM-309B Satellite Modem External Channel Unit Figure C-11 V.35 Interface Card MN/U-SDM309B Rev.
External Channel Unit SDM-309B Satellite Modem Figure C-12 V.35 Interface Block Diagram C-C–20 MN/U-SDM309B Rev.
SDM-309B Satellite Modem External Channel Unit 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. Signal Function SIGNAL GROUND SEND DATA SERIAL CLOCK TRANSMIT RECEIVE DATA REQUEST TO SEND SERIAL CLOCK RECEIVE CLEAR TO SEND DATA SET READY RECEIVE LINE SIGNAL DETECT SERIAL CLOCK TRANSMIT EXT.
External Channel Unit SDM-309B Satellite Modem 3.0 Front Panel Operation 3.1 Configuration Modem configuration may be viewed or changed by entering the “CONFIG” level from the ‘sELECT” menu on the front panel. Figures C-13 through C-15 show the structure of the front panel menu tree. The definitions of configurable functions follow: TXR Transmitter rate selection. Select one of four predefined transmitter coder/data rate combinations.
SDM-309B Satellite Modem TX_Power RFLoopBk IFLoopBk BBLoopBk External Channel Unit Programs the modulator output power level from -5 dBm to -15 dBm in 0.5 dB Steps. On entry the current transmitter power level is displayed with the flashing cursor on the first character. The up and down keys are used to increase or decrease the output power level in 0.5 dBm Steps. Press the “Enter” key to execute the change. *Programs the modem for RF loop-back operation.
External Channel Unit SDM-309B Satellite Modem TX_Clock Programs the modem for internal or external transmitter clock. RX_Clock On entry, the current status of the Transmit Clock is displayed with the flashing cursor on the first character. Use the arrow keys to select “Internal” or “External” transmit clock. Press the “Enter” key to execute the change. Programs the modem for inverted or normal receive clock.
SDM-309B Satellite Modem External Channel Unit 3.2 Monitor The “MONITOR” level is accessible from the ‘sELECT” menu. The following modem parameters are displayed in real time when selected. Raw_BER Raw bit error rate. * Range: <1.0E-4 to 2550E-4 Corr_BER Corrected bit error rate. * Range: <1.0E-8 to>1E-3 Eb/N0 Energy(bit)/noise ratio. * Range: <3.2dB to>9.7dB RxSignal Receive signal level. * Range: <-60dBm to>-30dBm * When the decoder loses lock no data is available and is so indicated. 3.
External Channel Unit SDM-309B Satellite Modem 3.4 Stored Faults The Modem stores the first ten (Flt0 - 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.
SDM-309B Satellite Modem Assign TX_Fltrs: Modulator Symbol Rate Assignment External Channel Unit 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.
External Channel Unit SDM-309B Satellite Modem Figure C-13 Menu Tree C-C–28 MN/U-SDM309B Rev.
SDM-309B Satellite Modem External Channel Unit Figure C-14 Menu Tree MN/U-SDM309B Rev.
External Channel Unit SDM-309B Satellite Modem Figure C-15 Menu Tree C-C–30 MN/U-SDM309B Rev.
SDM-309B Satellite Modem MN/U-SDM309B Rev.
Appendix D. SOFTWARE CHANGE SPECIFICATIONS Steps 1 through 5 are instructions for changing software on the Monitor and Control card. Steps 6 through 9 are instructions for changing software on the Viterbi Decoder card. If you do not need to change Viterbi Decoder software, skip to Step 10 and continue. 1. Remove the monitor and control card (0356) (black card ejector on vertical card). 2. Remove the proms in location U7 and U9 (28 Pin - .6" wide). 3.
Software Change Instructions SDM-309B Satellite Modem 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. Note: The data/code rate assignment in the “Utility” menu MUST match the filter assignment on the daughter card. Each daughter card is labeled with the filter assignment (A, B, C, and D) and the associated symbol rate. Example - the label for a 64KBPS, 7/8 rate, QPSK filter is 36.57. 12.
