CDM-500 Satellite Modem Installation and Operation Manual Part Number MN/CDM500.IOM Revision 1.
CDM-500 Satellite Modem Installation and Operation Manual Comtech EFData is an ISO 9001 Registered Company. Part Number MN/CDM500.IOM Revision 1.3 July 10, 2000 Copyright © Comtech EFData, 2000. All rights reserved. Printed in the USA. Comtech EFData, 2114 West 7th Street, Tempe, Arizona 85281 USA, (480) 333-2200, FAX: (480) 333-2161.
Customer Support Contact the Comtech EFData Customer Support Department for: • Product support or training • Information on upgrading or returning a product • Reporting comments or suggestions concerning manuals A Customer Support representative may be reached at: Comtech EFData Attention: Customer Support Department 2114 West 7th Street Tempe, Arizona 85281 USA (480) 333-2200 (Main Comtech EFData Number) (480) 333-4357 (Customer Support Desk) (480) 333-2161 FAX or, E-Mail can be sent to the Customer Suppor
CDM-500 Satellite Modem Preface Table of Contents Customer Support........................................................................................................................................................ i About this Manual .................................................................................................................................................... vii Conventions and References...........................................................................................
Preface CDM-500 Satellite Modem 2.2 Configuration................................................................................................................................................ 2–2 2.3 Select Internal IF Loop ................................................................................................................................ 2–2 2.4 Connect External Cables ......................................................................................................................
CDM-500 Satellite Modem 6.5.14 6.5.15 6.5.16 6.5.17 6.5.18 6.5.19 6.5.20 6.5.21 6.5.22 6.5.23 6.5.24 6.5.25 6.5.26 6.5.27 6.5.28 6.5.29 6.5.30 6.5.31 6.5.32 6.5.33 6.5.34 6.5.35 6.5.36 6.5.37 6.5.38 6.5.39 6.5.40 6.5.41 6.5.42 6.6 Preface (CONFIG, RX) DATA (Data Rate) ................................................................................................... 6–8 (CONFIG, RX) FEC (Forward Error Correction) ..............................................................................
Preface CDM-500 Satellite Modem 6.10 UTIL (Utility) ............................................................................................................................................. 6–25 6.10.1 (UTIL) SET-RTC (Set real-time clock) ............................................................................................ 6–25 6.10.2 (UTIL) DISPLAY (Display brightness)............................................................................................ 6–25 6.10.
CDM-500 Satellite Modem Preface B.5 Packet Structure...........................................................................................................................................B–3 B.5.1 Start Of Packet ....................................................................................................................................B–3 B.5.2 Address................................................................................................................................................
Preface CDM-500 Satellite Modem Figures FIGURE 1-1 CDM500 PHOTO............................................................................................................................... 1–1 FIGURE 4-1 FRONT AND BACK PANELS ......................................................................................................... 4–2 FIGURE 6-1 PRINCIPLE MENU TREE ................................................................................................................
CDM-500 Satellite Modem Preface About this Manual This manual provides installation and operation information for the Comtech EFData CDM-500 satellite modem. This is a technical document intended for earth station engineers, technicians, and operators responsible for the operation and maintenance of the CDM-500. Conventions and References Cautions and Warnings CAUTION CAUTION indicates a hazardous situation that, if not avoided, may result in minor or moderate injury.
Preface CDM-500 Satellite Modem IMPORTANT INFORMATION - PLEASE READ BEFORE INSTALLATION AND USE SAFETY NOTICES Electrical Safety The CDM-500 VSAT Modem has been shown to comply with the following safety standard: EN 60950: Safety of Information Technology Equipment, including electrical business machines The equipment is rated for operation over the range 100 - 240 volts AC. It has a maximum power consumption of 25 watts, and draws a maximum of 250 mA.
CDM-500 Satellite Modem Preface Installation The installation and connection to the line supply must be made in compliance to local or national wiring codes and regulations. The CDM-500 is designed for connection to a power system that has separate earth, line and neutral conductors. The equipment is not designed for connection to power system which has no direct connection to earth. The CDM-500 is shipped with a line inlet cable suitable for use in the country of operation.
Preface CDM-500 Satellite Modem Warranty Policy This Comtech EFData product is warranted against defects in material and workmanship for a period of two years from the date of shipment. During the warranty period, Comtech 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 Comtech EFData and all related custom, taxes, tariffs, insurance, etc.
1 Chapter 1. INTRODUCTION 1.0 Introduction The CDM-500 (Figure 1-1) is a very low-cost Closed Network Satellite Modem, intended for VSAT applications. It offers variable data rates from 2.4 to 512kbps, in BPSK and QPSK modes. It is extremely compact, being 1U high and 12 inches deep, and consumes only 18 watts. It has a front panel VFD display and keypad for local configuration and control, although it can be fully remote-controlled.
Introduction CDM-500 Closed Network Satellite Modem The CDM-500 includes, as standard, a universal data interface which eliminates the need to exchange interface cards for different applications. The interfaces offered include RS422 (EIA530) DCE, V.35 DCE, synchronous RS232 DCE, and X.21 DTE and DCE. The internal software is both powerful and flexible, and permits the user to store, and then retrieve, up to 10 different modem configurations.
2 Chapter 2. INSTALLATION 2.0 Unpacking Inspect shipping containers for damage. If shipping containers are damaged, they should be kept until the contents of the shipment have been carefully inspected and checked for normal operation. Remove the packing list from the outside of the shipping carton. Open the carton and remove the contents, checking the contents against the packing list. Verify completeness of the shipment and that the unit functions correctly.
Installation CDM-500 Closed Network Satellite Modem Note that the CDM-500 is very light - under 7 lbs (3.2 kgs), and very short – 12 ins (305 mm). For this reason, it has not been designed to have rack slides mounted to the side of the chassis. However, Comtech recommends that some method of support within the rack should be employed, such a rack shelves. If the user is any doubt, please consult the factory. 2.
3 Chapter 3. FUNCTION 3.0 Functional Description The CDM-500 has two fundamentally different types of interface - IF and data. The data interface is a bi-directional path which connects with the customer’s equipment (assumed to be the DTE) and the modem (assumed to be the DCE). The IF interface provides a bidirectional link with the satellite via the uplink and downlink equipment.
Function CDM-500 Closed Network Satellite Modem Following this, the data passes to the Plesiochronous/Doppler buffer, which has a programmable size, or may be bypassed. From here, the receive clock and data signals are routed to the terrestrial interface, and are passed to the externally connected DTE equipment. 3–2 Rev. 1.
4 Chapter 4. PHYSICAL DESCRIPTION The CDM-500 is constructed as a 1U high rack-mounting chassis, which can be free-standing, if desired. It is provided with rack-handles at the front to facilitate its removal from, and placement into a rack. Figure 1 shows the front and rear panels of the modem. 4.1 Front Panel On the front panel of the unit is the Vacuum Fluorescent Display (VFD), keypad, and eight LED indicators. The user enters data via the keypad, and messages are displayed on the VFD.
Physical Description CDM-500 Closed Network Satellite Modem Table 4-1- Front Panel Led Indicators LED Unit Status Transmit Traffic Receive Traffic On line Color Red Orange Green Green Off Green Off Green Off Orange Stored Event Off Orange Remote Off EDMAC Mode Orange Off Test Mode Orange Off Condition A Unit Fault exists (Example: PSU fault) No Unit Faults, but a Traffic Fault exists No Unit Faults, or Traffic Faults No Tx Traffic Faults A Tx Traffic fault exists OR the Tx Carrier is in OFF state
CDM-500 Closed Network Satellite Modem 4.2 Physical Description Rear Panel All external cables are attached to connectors on the rear panel of the CDM-500. These comprise the IEC line input connector, the Receive and Transmit IF connectors, the Data connector, Alarms connector, Remote Control connector, and Auxiliary Serial connector. The IEC line input connector contains the ON/OFF switch for the unit.
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5 Chapter 5. CONNECTOR PINOUTS 5.1 Connector Pinouts 5.1.
Connector Pinouts 5.2 CDM-500 Closed Network Satellite Modem • DO NOT connect signals to pins which are not shown - these pins are reserved for use by the redundancy system • ‘B’ signal lines are not used for RS232 applications • For X.
CDM-500 Closed Network Satellite Modem 5.3 Connector Pinouts Remote Control Connector - 9 Pin ‘D’ Type Male Table 5-3 Remote Control Connector Pin 1 5 9 8 7 6 2 3 4 5.4 Description Ground Ground RS485 Transmit Data A RS485 Transmit Data B RS485 Receive Data A RS485 Receive Data B RS232 Transmit Data RS232 Receive Data Reserved - do not connect to this pin Auxiliary Serial Connector - He1402 3 Pin Header Table 5-4 Auxiliary Serial Connector Pin 1 2 3 Rev. 1.
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6 Chapter 6. FRONT PANEL OPERATION 6.1 Description The user can fully control and monitor the operation of the CDM-500 from the front panel, using the keypad and display. Nested menus are used, which display all available options, and prompt the user to carry out a required action. The display has two lines each of 24 characters. On most menu screens, the user will observe a flashing solid block cursor, which blinks at a once-per-second rate. This indicates the currently selected item, digit, or field.
Front Panel Operation CDM-500 Closed Network Satellite Modem RIGHT ARROW Moves the cursor to the right, when it is displayed LEFT ARROW Moves the cursor to the left, when it is displayed UP ARROW Used for editing the value at the current cursor position, if appropriate. If this is a numeric field, this will increment the value. DOWN ARROW Used for editing the value at the current cursor position, if appropriate. If this is a numeric field, this will decrement the value.
CDM-500 Closed Network Satellite Modem 6.2 Front Panel Operation Menu Trees Figure 2 shows the menu structure of the CDM-500. Figure 6-1 Principle Menu Tree Rev. 1.
Front Panel Operation 6.3 CDM-500 Closed Network Satellite Modem OPENING SCREEN COMTECH CDM-500 MODEM S/N 0102 S/W VER 1.01 This screen is displayed whenever power is first applied to the unit. Pressing any key will take the user to the top level selection screen: 6.
CDM-500 Closed Network Satellite Modem 6.5 Front Panel Operation CONFIG: CONFIG: ALL TX RX FRAME INTFC REMCONT MASK IMPED The sub-branches available are: ALL TX (Transmit) RX (Receive) FRAME INTFC (Interface) REMCONT (Remote Control) MASK IMPED (Impedance) This menu sub-branch permits the user to completely configure the unit, being prompted, step by step, to make choices, or edit data.
Front Panel Operation 6.5.2 CDM-500 Closed Network Satellite Modem (CONFIG, TX) MOD (Modulation) SELECT TX MODULATION: BPSK QPSK (PRESS ENTER) Select BPSK or QPSK modulation, using the LEFT/RIGHT arrow keys, then press ENTER. 6.5.3 (CONFIG, TX) FREQ (Frequency) EDIT TX FREQUENCY: 72.2345 MHz (PRESS ENT) Edit the transmit frequency by selecting the digit to be edited, using the LEFT/RIGHT arrow keys. Change the value of the digit using the UP/DOWN arrow keys. Press ENTER.
CDM-500 Closed Network Satellite Modem 6.5.7 Front Panel Operation (CONFIG, TX) PWR (Power) EDIT OUTPUT POWER LEVEL: -03.9 dBm (PRESS ENTER) Edit the output power level, over the range 0 to -20 dBm, by selecting the digit to be edited, using the LEFT/RIGHT arrow keys). Change the value of the digit using the UP/DOWN arrow keys. Press ENTER. 6.5.8 (CONFIG, TX) SCRAM (Scrambling) SELECT TX SCRAMBLING: OFF ON (PRESS ENTER) Select ON or OFF, using the LEFT/RIGHT arrow keys, then press ENTER.
Front Panel Operation CDM-500 Closed Network Satellite Modem manufacturer’s modems. (Early versions of the modem did not incorporate this feature see the INFO, MISC section for details) 6.5.11 (CONFIG) RX (Receive) RX: MOD FRQ DATA FEC ACQ DESCRAM CLK BUF RSI Eb/No The sub-branches available are: 6.5.12 (CONFIG, RX) MOD (Modulation) SELECT RX MODULATION: BPSK QPSK (PRESS ENTER) Select BPSK or QPSK modulation, using the LEFT/RIGHT arrow keys, then press ENTER. 6.5.
CDM-500 Closed Network Satellite Modem Front Panel Operation NOTE: If BPSK is selected, only Rate 1/2 is permitted. A warning screen will be displayed if this sub-branch is entered when in BPSK mode. 6.5.16 (CONFIG, RX) ACQ (Acquisition sweep range) EDIT RX ACQ SWEEP RANGE: +/- 25 kHz (PRESS ENTER) Edit the acquisition sweep range of the demodulator by selecting the digit to be edited, using the LEFT/RIGHT arrow keys). Change the value of the digit using the UP/DOWN arrow keys. Press Enter.
Front Panel Operation 6.5.19 CDM-500 Closed Network Satellite Modem (CONFIG, RX) BUF (Buffer size) EDIT RX BUFFER SIZE: +/-4096 BITS (PRESS ENT) Edit the size of the Plesiochronous/Doppler Buffer in bits using the UP/DOWN arrow keys. Press Enter. Values of +/- 256, 512, 1024, 2048 and 4096 bits are possible. If the buffer is disabled, a warning message will be displayed if this screen is entered. 6.5.
CDM-500 Closed Network Satellite Modem 6.5.24 Front Panel Operation (CONFIG, FRAME) FRAMED SELECT FRAMING OPTION: EDMAC-OFF EDMAC-ON (ENT) Select EDMAC-OFF or EDMAC-ON, using the LEFT/RIGHT arrow keys, then press Enter. Embedded Distant-end Monitor And Control is enabled or disabled in this sub-menu. If EDMAC-OFF is selected then none of the EDMAC features are available, even though framing will still be enabled.
Front Panel Operation 6.5.27 CDM-500 Closed Network Satellite Modem (CONFIG, FRAME, FRAMED, ON) EDMAC SLAVE EDIT THIS UNIT'S ADDRESS 0245 (SEE HANDBOOK)(ENT) Edit the address of this SLAVE unit. Select the digit to be edited, using the LEFT/RIGHT arrow keys. Change the value of the digit using the UP/DOWN arrow keys. Press Enter. The valid range of addresses is from 1 to 9999, although ‘base 10' values will be automatically skipped.
CDM-500 Closed Network Satellite Modem 6.5.32 Front Panel Operation (CONFIG, REMOTE, BAUD) If BAUD RATE is selected: EDIT LOCAL BUS BAUDRATE: 19200 BAUD (PRESS ENTER) Edit the baud rate of the remote control bus connected locally to the M&C computer. Change the value using the UP/DOWN arrow keys. Press Enter. Values of 300, 1200, 2400, 4800, 9600 and 19200 baud are possible. Note that the asynchronous character format is FIXED at 8 data bits, 1 stop bit, no parity (8-1-N). 6.5.
Front Panel Operation CDM-500 Closed Network Satellite Modem According to the choice selected, one of the following sub-menus will be displayed: 6.5.37 (CONFIG, MASK) AGC SELECT AGC ALARM MASK: ACTIVE MASKED(PRESS ENT) Select ACTIVE or MASKED, using the LEFT/RIGHT arrow keys, then press Enter.
CDM-500 Closed Network Satellite Modem Front Panel Operation If the user selects ACTIVE, then a Receive Traffic fault will be generated whenever the receive circuitry senses that the buffer has either underflowed, or overflowed. If the user selects MASKED, no alarm will be generated under these conditions. 6.5.41 (CONFIG, MASK) TX-AIS SEL TX-AIS ALARM MASK: ACTIVE MASKED(PRESS ENT) Select ACTIVE or MASKED, using the LEFT/RIGHT arrow keys, then press Enter.
Front Panel Operation 6.6 CDM-500 Closed Network Satellite Modem TEST TEST: NORM TX-CW TX-1,0 IF] DIG] I/O] (ENT) Select NORM, TX-CW, TX-1,0, IF LOOP, DIG LOOP, or I/O LOOP, using the LEFT/RIGHT arrow keys, then press Enter. This sub-menu permits the user to select the following test modes: NORM (Normal)This clears any test modes or loopbacks, and places the unit back into an operational state TX-CW (Transmit CW)This is a test mode which forces the modulator to transmit a pure carrier (unmodulated).
CDM-500 Closed Network Satellite Modem 6.7 Front Panel Operation INFO (Information) INFO:ID TX RX BUFF EDMAC REMCONT MASK MISC(ENTER) Select ID, TX, RX, BUFF, EDMAC, REMCONT, MASK, or MISC using the LEFT/RIGHT arrow keys, then press Enter. These screens display information on the current configuration of the unit. Depending on the choice selected, one of the following screens will be displayed: 6.7.
Front Panel Operation CDM-500 Closed Network Satellite Modem The information displayed here is as follows: Top line, left to right: • Receive Frequency • Receive Data Rate • Framing status (F = framing on, T = transparent) Bottom line, left to right: • Modulation type (Q = QPSK, B = BPSK) • Code Rate • Descrambler state (D = Descrambler on, N = off) • Clocking Mode • Demod Sweep Acquisition range • RSI state (I = Receive Spectral Inversion on, N = off) 6.7.
CDM-500 Closed Network Satellite Modem 6.7.8 Front Panel Operation (INFO) MISC (Miscellaneous information) MISC: IF-LOOP 50 OHMS * 1:1 LINK IDLE ONLINE This screen shows the following: • • • • Test mode IF impedance 1:1 link status - if the CRS-100 1:1 module is being used, this shows the status of the serial link between the two units.
Front Panel Operation 6.8 CDM-500 Closed Network Satellite Modem MONIT (Monitor) SELECT MONITOR: ALARMS STORED EVENTS RX-PARAMS Select ALARMS, STORED EVENTS, or RX-PARAMS using the LEFT/RIGHT arrow keys, then press Enter. If the user selects ALARMS, the following sub-menu is displayed: 6.8.1 (MONIT) ALARMS LIVE ALARMS: UNIT RECEIVE TRANSMIT Select UNIT, RECEIVE or TRANSMIT, using the LEFT/RIGHT arrow keys, then press Enter.
CDM-500 Closed Network Satellite Modem 6.8.5 Front Panel Operation (MONIT) STORED EVENTS STORED EVENTS: VIEW CLEAR ALL (PRESS ENTER) Select VIEW or CLEAR ALL, using the LEFT/RIGHT arrow keys, then press Enter. If the user selects VIEW, the following screen is displayed: 6.8.6 (MON, EVENTS) VIEW LOG23: 30/11/97 10:37:32 FT - DEMOD LOCK (UP/DWN) Scroll backwards or forwards through the entries in the event log, using the UP/DOWN arrow keys. Press ENTER or CLEAR to return to the previous menu.
Front Panel Operation 6.8.7 CDM-500 Closed Network Satellite Modem (MONIT) RX-PARAMS (Receive Parameters) RX:EbNo=5.7dB dF=+11.7k BER=3.4E-9 BUF-FILL=50% If the demodulator is locked, this screen shows the following: Eb/No This shows the value of Eb/No calculated by the demodulator. The value referred to here is the energy per information bit (Ebi), divided by the noise spectral density (No). dF This is the frequency offset of the received carrier, in kHz, with a displayed resolution of 100 Hz.
CDM-500 Closed Network Satellite Modem 6.9 Front Panel Operation STORE/LD (Store/Load) STORE/LOAD CONFIG: STORE LOAD (PRESS ENTER) Select STORE or LOAD using the LEFT/RIGHT arrow keys, then press Enter. These sub-menus permit the user to store or load up to 10 different modem configurations in the non-volatile memory of the modem Selecting STORE will display the following screen: 6.9.
Front Panel Operation CDM-500 Closed Network Satellite Modem Select the location to load a configuration from, using the UP/DOWN arrow keys, then press Enter. Locations 1 through 10 are available. If the selected location contains valid data, the following screen will be displayed: THE NEW CONFIGURATION HAS BEEN LOADED (ENTER) Press ENTER or CLEAR to return to the previous menu.
CDM-500 Closed Network Satellite Modem 6.10 Front Panel Operation UTIL (Utility) UTILITY: SET-RTC DISPLAY MAN-1:1 RECENTER-BUF ID Select SET-RTC, DISPLAY MAN-1:1, RECENTER-BUF, OR ID, using the LEFT/RIGHT arrow keys, then press Enter. This sub-menu permits the user to select from a number of different utility functions, which are described below: 6.10.
Front Panel Operation 6.10.5 CDM-500 Closed Network Satellite Modem (UTIL) ID (Circuit ID) EDIT CIRCUIT ID: (ENTER) THIS IS A TEST MESSAGE Edit the Circuit ID string, using the LEFT/RIGHT and UP/DOWN arrow keys. Only the bottom line is available (24 characters). The cursor selects the position on the bottom line (LEFT/RIGHT) and the character is then edited (UP/DOWN). The following characters are available: Space ( ) * + - , . / 0-9 and A-Z. After composing the string, press Enter. 6–26 Rev. 1.
7 Chapter 7. CLOCKING When dealing with satellite modems, the subject of clocking can be a complex issue. This section describes the various clocking options which are available with the CDM-500. 7.1 Transmit Clocking There are three transmit clocking modes in the CDM-500. EIA-422/449 signal mnemonics will be used for illustration, but the description applies equally to V.35, and synchronous EIA-232. 7.1.
Clocking 7.1.3 CDM-500 Closed Network Satellite Modem Loop-Timed In certain circumstances, a terminal at the distant-end of a satellite link may be required to provide a clock to the DTE equipment which is locked to the receive satellite signal. This is similar to Internal Clock mode, in that the modem will source Send Timing (ST) to the DTE, but now the timing is derived from the demodulator.
8 Chapter 8. EDMAC CHANNEL 8.1 Theory Of Operation As explained earlier, EDMAC is an acronym for Embedded Distant-end Monitor And Control. This is a feature which permits the user to access the M&C features of modems which are at the distant-end of a satellite link. This is accomplished by adding extra information to the user’s data, but in a manner which is completely transparent to the user. On the transmit side: The data is split into frames - each frame containing 1008 bits.
EDMAC Channel CDM-500 Closed Network Satellite Modem therefore has a clear advantage over V.35 scrambling. This is fortunate, as there is a penalty to be paid for adding the framing. By adding the extra 5% to the transmitted data rate, the effective Eb/No seen by the user will degrade by a factor of 10log(1.05), or 0.21 dB. The use of an externally synchronized scrambler and descrambler almost exactly compensates for this degradation.
CDM-500 Closed Network Satellite Modem EDMAC Channel This approach does not require any additional cabling - connection is made using the normal M&C remote port. Furthermore, the user does not have to worry about configuring the baud rate of the M&C connection to match the lowest data rate modem in the system. The M&C system can have mixed data-rate modems, from 2.4 kbps to 512 kbps, and still run at 19,200 baud. (It should be pointed out that at 2.
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A Appendix A. SUMMARY OF SPECIFICATIONS A.1 Modulator Data rate range Operating modes Scrambling FEC Transmit filtering Output frequency Harmonics and spurious Transmit on/off ratio Output phase noise Output power Accuracy Rev. 1.3 Overall, 2.4 - 512 kbps 2.4 kbps - 256 kbps, Rate 1/2 BPSK 4.8 kbps - 512 kbps Rate 1/2 QPSK 7.
Spec Summary CDM-500 Closed Network Satellite Modem Output impedance Output connector Clocking options External TX Carrier Off A.
CDM-500 Closed Network Satellite Modem A.3 Data Interfaces Built in Pinout A.4 RS422/EIA530 DCE (also supports X.21 DCE and DTE) V.35 DCE Synchronous RS232 (Front panel selectable) Per EIA530 (25 pin ‘D’ type female) Miscellaneous Front panel A.
Spec Summary CDM-500 Closed Network Satellite Modem Figure A-1 BER Viterbi Decoding A–4 Rev. 1.
B Appendix B. REMOTE CONTROL B.1 Introduction This section describes the protocol and message command set for remote monitor and control of the CDM-500 Modem. The electrical interface is either an EIA-485 multi-drop bus (for the control of many devices) or an EIA-232 connection (for the control of a single device), and data is transmitted in asynchronous serial form, using ASCII characters.
Remote Control CDM-500 Closed Network Satellite Modem In the other direction, on the other pair, each target has a tri-stateable line driver connected, and the controller has a line-receiver connected. All the line drivers are held in high-impedance mode until one (and only one) target transmits back to the controller. Each target has a unique address, and each time the controller transmits, in a framed ‘packet’ of data, the address of the intended recipient target is included.
CDM-500 Closed Network Satellite Modem Remote Control target. The exception to this is when the controller broadcasts a message (such as Set time/date) using Address 0, when the target is set to EIA-485 mode. B.
Remote Control B.5.3 CDM-500 Closed Network Satellite Modem Instruction Code This is a three-character alphabetic sequence which identifies the subject of the message. Wherever possible, the instruction codes have been chosen to have some significance. For example TFQ for transmit frequency, RMD for receive modulation type, etc. This aids in the readability of the message, should it be displayed in its raw ASCII form. Only upper case alphabetic characters may be used (A-Z, ASCII codes 65 - 90). B.5.
CDM-500 Closed Network Satellite Modem Remote Control Second, if the controller sends an instruction to set a parameter to a particular value, then, providing the value sent in the argument is valid, the target will acknowledge the message by replying with TFQ= (with no message arguments).
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CDM-500 Closed Network Satellite Modem Parameter Type Tx Frequency Command (Instruction Code and qualifier) TFQ= Arguments for Command or Response to Query 8 bytes Tx Data Rate TDR= 7 bytes Tx FEC Code Rate TCR= 1 byte, value of 1,3 or 7 Tx Modulation Type TMD= 1 byte, value of 1 or 2 Tx Spectrum Invert TSI= 1 byte, value of 0 or 1 Rev. 1.
Remote Control Parameter Command Type (Instruction Code and qualifier) Tx Scrambler TSC= Arguments for Command or Response to Query 1 byte, value of 0 or 1 Tx Power Level TPL= 4 bytes Tx Clock Source TCK= 1 byte, value of 1,2 or 3 Tx Carrier On/Off State TXO= 1 byte, value of 0, 1 or 2 Rx Frequency RFQ= 8 bytes Rx Data Rate RDR= 7 bytes B–8 Description of arguments (note that all arguments are ASCII numeric codes, that is, ASCII codes between 48 and 57) Response to Command (target to cont
CDM-500 Closed Network Satellite Modem Parameter Command Arguments Type (Instruction for Command Code and or Response to qualifier) Query Rx FEC Code RCR= 1 byte, value of Rate 1,3 or 7 Remote Control Description of arguments (note that all arguments are ASCII numeric codes, that is, ASCII codes between 48 and 57) Response to Command (target to controller) Command or Query. Rx FEC Code rate, where: 1 = Rate 1/2, 3 = Rate 3/4, 7 = Rate 7/8 All other codes invalid.
Remote Control Parameter Command Type (Instruction Code and qualifier) Eb/No Alarm EBA= Point Arguments for Command or Response to Query 4 bytes, numerical Rx Buffer Size RBS= 1 byte, value of 1,2,3,4 or 5 Unit Interface Type ITF= 1 byte, value of 1,2 or 3 Unit Framing Mode FRM= 1 byte, value of 0 or 1 Command or Query.
CDM-500 Closed Network Satellite Modem Parameter Command Arguments Type (Instruction for Command Code and or Response to qualifier) Query Unit Alarm MSK= 5 bytes, each Mask with a value of 0 or 1 EDMAC Slave Address ESA= 4 bytes, numerical Circuit ID string CID= 24 bytes, ASCII Outdoor Unit Comms ODU= 1 byte, of 0 or 1 value Rev. 1.
Remote Control Parameter Command Type (Instruction Code and qualifier) Global MGC= Configuration B–12 Arguments for Command or Response to Query 74 bytes, with numerical entries, fixed value entries, and delimiters Description of arguments (note that all arguments are ASCII numeric codes, that is, ASCII codes between 48 and 57) Response to Command (target to controller) Command or Query. Global configuration of unit, in the form: FFF.FFFF DDD.DDDRMVSPP.PCXfff.ffffddd.dddrmvsww ctt.
CDM-500 Closed Network Satellite Modem Parameter Command Arguments Type (Instruction for Command Code and or Response to qualifier) Query Config Store CST= 1 byte, numerical, 0 to 9 Remote Control Description of arguments (note that all arguments are ASCII numeric codes, that is, ASCII codes between 48 and 57) Response to Command (target to controller) Forces the unit to store the current modem configuration in Configuration Memory location defined by the one byte argument (0 to 9).
Remote Control Parameter Command Type (Instruction Code and qualifier) Power level DAC= DAC set Arguments for Command or Response to Query 4 bytes, numerical Description of arguments (note that all arguments are ASCII numeric codes, that is, ASCII codes between 48 and 57) Response to Command (target to controller) FACTORY USE ONLY Modulator power output DAC setting. An argument between 0000 and 4095 is required Example: DAC=1287 (Used for power-level calibration) Command only.
CDM-500 Closed Network Satellite Modem Parameter Command Arguments Type (Instruction for Command Code and or Response to qualifier) Query Retrieve next N/A 75 bytes 5 unread Stored Events Retrieve Number of unread Stored Events N/A 2 bytes, numerical Rx Eb/No N/A 4 bytes, numerical Rx Freq Offset N/A 5 bytes, 1st , + or -, next 4bytes numerical Rev. 1.
Remote Control Parameter Command Type (Instruction Code and qualifier) Buffer Fill N/A State Arguments for Command or Response to Query 2 bytes, numerical Rx BER N/A 5 bytes Redundancy State N/ A 1 byte, value of 0 or 1 Local/Remote Status N/A 1 byte, value of 0 or 1 Serial Number SNO= 4 bytes numerical Software Revision N/A 4 bytes, numerical Equipment ID N/A 6 bytes, numerical B–16 Description of arguments (note that all arguments are ASCII numeric codes, that is, ASCII codes between
CDM-500 Closed Network Satellite Modem Parameter Command Arguments Type (Instruction for Command Code and or Response to qualifier) Query Faults and N/A 5 bytes, first 3 Status bytes numerical4th and 5th bytes, value of 0 or 1 Remote Control Description of arguments (note that all arguments are ASCII numeric codes, that is, ASCII codes between 48 and 57) Response to Command (target to controller) Query only.
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-AAddress................................................... B–4 Alarms Connector .................................. 5–2 Approvals ............................................... A–3 Auxiliary Serial Connector .................... 5–3 -BBasic Protocol ........................................ B–2 Buffer Disabled ...................................... 7–2 Buffer Enabled, Rx<>Tx........................ 7–2 Buffer Enabled, Rx=Tx.......................... 7–2 -CCONFIG) FRAME (Framing Mode) .....
Index End Of Packet ........................................ B–6 Environmental ........................................ vi Exclusive Remedies ............................... viii External Clock........................................ 7–1 -FFront Panel ............................................. 4–1 Functional Description........................... 3–1 Fuses....................................................... vi -IINFO (Information)................................ 6–19 INFO) BUFF (Buffer information) .
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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