1. Manuals
  2. Brands
  3. Comtech EF Data Manuals
  4. Modem
  5. CDM-500
  6. Installation and operation manual

Comtech EF Data CDM-500 Installation And Operation Manual

Satellite modem
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
CDM-500
Satellite Modem
Installation and Operation Manual
Part Number MN/CDM500.IOM
Revision 1.3

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the CDM-500 and is the answer not in the manual?

Questions and answers

Related Manuals for Comtech EF Data CDM-500

Summary of Contents for Comtech EF Data CDM-500

  • Page 1 CDM-500 Satellite Modem Installation and Operation Manual Part Number MN/CDM500.IOM Revision 1.3...

  • Page 2: Installation And Operation Manual

    CDM-500 Satellite Modem Installation and Operation Manual Part Number MN/CDM500.IOM Comtech EFData is an ISO 9001 Revision 1.3 Registered Company. 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.

  • Page 4: Customer Support

    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...

  • Page 6: Table Of Contents

    CDM-500 Satellite Modem Preface Table of Contents Customer Support................................ i About this Manual ..............................vii Conventions and References........................... vii Cautions and Warnings ............................vii Metric Conversion.............................. vii Reporting Comments or Suggestions Concerning this Manual ................vii SAFETY NOTICES..............................viii Electrical Safety..............................viii Fuses ..................................
  • Page 7 Preface CDM-500 Satellite Modem Configuration..............................2–2 Select Internal IF Loop ..........................2–2 Connect External Cables ..........................2–2 FUNCTION ..................3–1 CHAPTER 3. Functional Description..........................3–1 PHYSICAL DESCRIPTION ..............4–1 CHAPTER 4. Front Panel ..............................4–1 Rear Panel..............................4–3 CONNECTOR PINOUTS..............5–1 CHAPTER 5.
  • Page 8 CDM-500 Satellite Modem Preface 6.5.14 (CONFIG, RX) DATA (Data Rate) ....................6–8 6.5.15 (CONFIG, RX) FEC (Forward Error Correction) ................6–8 6.5.16 (CONFIG, RX) ACQ (Acquisition sweep range) ................6–9 6.5.17 (CONFIG, RX) DESCRAM (Descrambler)..................6–9 6.5.18 (CONFIG, RX) CLK (Clocking)......................6–9 6.5.19...
  • Page 9 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 6.10.3 (UTIL) MAN-1:1 (Manual 1:1 switchover) ..................6–25 6.10.4 (UTIL) RECENTER-BUF (re-center buffer) ..................6–25 6.10.5 (UTIL) ID (Circuit ID)........................6–26 CLOCKING ..................7–1...
  • Page 10 CDM-500 Satellite Modem Preface Packet Structure............................B–3 B.5.1 Start Of Packet ............................B–3 B.5.2 Address..............................B–3 B.5.3 Instruction Code ..........................B–4 B.5.4 Instruction Code Qualifier........................B–4 B.5.5 Message Arguments ..........................B–5 B.5.6 End Of Packet .............................B–5 Rev. 1.3...
  • Page 11 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 ........................ 6–3 FIGURE A-1 BER VITERBI DECODING......................A–4 Tables TABLE 4-1- FRONT PANEL LED INDICATORS ....................4–2 TABLE 5-1 25 PIN ‘D’...

  • Page 12: About This Manual

    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.

  • Page 13: Safety Notices

    The user should observe the following instructions: Fuses The CDM-500 is fitted with two fuses - one each for line and neutral connections. These are contained within the body of the IEC power inlet connector, behind a small plastic flap.

  • Page 14: Installation

    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. If it is necessary to replace this cable, ensure the replacement has an equivalent specification.

  • Page 15: Warranty Policy

    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.

  • Page 16: Chapter 1. Introduction

    INTRODUCTION 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.
  • Page 17 The CDM-500 has been designed as a companion product for the Comtech EFData line of RF Transceivers. As such, the Modem incorporates an FSK serial link which can be activated on the Receive IF port, for the purpose of communicating with a Transceiver, if connected.

  • Page 18: Chapter 2. Installation

    Mounting If the CDM-500 is to be mounted in a rack, ensure that there is adequate clearance for ventilation. The CDM-500 does not include a cooling fan, so care must be taken that too many units are not mounted on top of each other. The limit is four units, and then a blank 1U panel must be inserted to allow sufficient airflow around the units.

  • Page 19: Configuration

    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.

  • Page 20: Chapter 3. Function

    FUNCTION 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 bi- directional link with the satellite via the uplink and downlink equipment.
  • Page 21 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.

  • Page 22: Chapter 4. Physical Description

    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.

  • Page 23: Figure 4-1 Front And Back Panels

    Physical Description CDM-500 Closed Network Satellite Modem Table 4-1- Front Panel Led Indicators Color Condition A Unit Fault exists (Example: PSU fault) Unit Status Orange No Unit Faults, but a Traffic Fault exists Green No Unit Faults, or Traffic Faults...

  • Page 24: Rear Panel

    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.
  • Page 25 Physical Description CDM-500 Closed Network Satellite Modem This page is intentionally blank. 4–4 Rev. 1.3...

  • Page 26: Chapter 5. Connector Pinouts

    Chapter 5. CONNECTOR PINOUTS Connector Pinouts 5.1.1 Data Connector 25 Pin ‘D’ Type Female Table 5-1 25 Pin ‘D’ Type Female Generic Signal Direction RS422/ EIA V.35 RS232 Circuit description Shield Shield Transmit Data A DTE to Modem SD A SD A Receive Data A Modem to DTE...

  • Page 27: Alarms Connector - 15 Pin 'D' Type Male

    Connector Pinouts 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 •...

  • Page 28: Remote Control Connector - 9 Pin 'D' Type Male

    CDM-500 Closed Network Satellite Modem Connector Pinouts Remote Control Connector - 9 Pin ‘D’ Type Male Table 5-3 Remote Control Connector Description Ground Ground RS485 Transmit Data A RS485 Transmit Data B RS485 Receive Data A RS485 Receive Data B...
  • Page 29 Connector Pinouts CDM-500 Closed Network Satellite Modem This page has been intentionally left blank. 5–4 Rev. 1.3...

  • Page 30: Chapter 6. Front Panel Operation

    FRONT PANEL OPERATION 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.
  • Page 31 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.

  • Page 32: Menu Trees

    CDM-500 Closed Network Satellite Modem Front Panel Operation Menu Trees Figure 2 shows the menu structure of the CDM-500. Figure 6-1 Principle Menu Tree Rev. 1.3 6–3...

  • Page 33: Opening Screen

    Front Panel Operation 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:...

  • Page 34: Config

    As an example, certain multiplexers use ‘all ones’ as an idle pattern. However, by convention, the ‘all ones’ condition is taken to be the Alarm Indication Signal (AIS). The CDM-500 monitors for the AIS condition, and if desired, this alarm may be masked.

  • Page 35: Config, Tx) Mod (Modulation)

    Front Panel Operation CDM-500 Closed Network Satellite Modem 6.5.2 (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)

  • Page 36: Config, Tx) Pwr (Power)

    Select either INT (Internal), EXT (External) or LOOP-TIMED, using the LEFT/RIGHT arrow keys, then press ENTER. INTERNAL indicates that the CDM-500 will supply a clock to the DTE, which is derived from its internal high-stability source. EXTERNAL indicates that the CDM-500 expects to receive a clock from the DTE, to which the unit can phase-lock its internal circuits.

  • Page 37: Config) Rx (Receive)

    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...

  • Page 38: Config, Rx) Acq (Acquisition Sweep Range)

    TRANSMIT clock. In this way, the receive data will be perfectly synchronous with this local clock. The CDM-500 can be operated with independent transmit receive and transmit data rates. Even in this configuration, where RX data rate <>...

  • Page 39: Config, Rx) Buf (Buffer Size)

    Front Panel Operation CDM-500 Closed Network Satellite Modem 6.5.19 (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.

  • Page 40: Config, Frame) Framed

    CDM-500 Closed Network Satellite Modem Front Panel Operation 6.5.24 (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.

  • Page 41: Config, Frame, Framed, On) Edmac Slave

    Front Panel Operation CDM-500 Closed Network Satellite Modem 6.5.27 (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.

  • Page 42: Config, Remote, Baud)

    CDM-500 Closed Network Satellite Modem Front Panel Operation 6.5.32 (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.

  • Page 43: Config, Mask) Agc

    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.

  • Page 44: Config, Mask) Tx-Ais

    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.

  • Page 45: Test

    Front Panel Operation 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:...

  • Page 46: Info (Information)

    CDM-500 Closed Network Satellite Modem 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.

  • Page 47: Info) Buff (Buffer Information)

    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: •...

  • Page 48: Info) Misc (Miscellaneous Information)

    CDM-500 Closed Network Satellite Modem Front Panel Operation 6.7.8 (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.

  • Page 49: Monit (Monitor)

    Front Panel Operation 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...

  • Page 50: Monit) Stored Events

    CDM-500 Closed Network Satellite Modem Front Panel Operation 6.8.5 (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...

  • Page 51: Monit) Rx-Params (Receive Parameters)

    Front Panel Operation CDM-500 Closed Network Satellite Modem 6.8.7 (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).

  • Page 52: Store/Ld (Store/Load)

    CDM-500 Closed Network Satellite Modem 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...
  • Page 53 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...

  • Page 54: Util (Utility)

    CDM-500 Closed Network Satellite Modem Front Panel Operation 6.10 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: 6.10.1...

  • Page 55: Util) Id (Circuit Id)

    Front Panel Operation CDM-500 Closed Network Satellite Modem 6.10.5 (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).

  • Page 56: Chapter 7. Clocking

    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. 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...

  • Page 57: Loop-Timed

    ST, rather than a clock which may jitter and wander in a random fashion. Receive Clocking Like the transmit side, there are three receive clocking modes in the CDM-500. 7.2.1 Buffer Disabled When the buffer is disabled, the receive clock (Receive Timing, or RT) is derived directly from the demodulator, and hence will be subject to plesiochronous and Doppler offsets.

  • Page 58: Chapter 8. Edmac Channel

    Chapter 8. EDMAC CHANNEL 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.

  • Page 59: M&C Connection

    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.

  • Page 60: Setup Summary

    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.
  • Page 61 EDMAC Channel CDM-500 Closed Network Satellite Modem This page has been intentionally left blank. 8–4 Rev. 1.3...

  • Page 62: Appendix A. Summary Of Specifications

    Appendix A. SUMMARY OF SPECIFICATIONS Modulator Data rate range Overall, 2.4 - 512 kbps 2.4 kbps - 256 kbps, Rate 1/2 BPSK 4.8 kbps - 512 kbps Rate 1/2 QPSK 7.2 kbps - 512 kbps Rate 3/4 QPSK 8 kbps - 512 kbps Rate 7/8 QPSK Operating modes Transparent, Closed Network Proprietary EDMAC framed mode - 5% overhead...

  • Page 63: Demodulator

    Spec Summary CDM-500 Closed Network Satellite Modem Output 50 and 75 ohms, front panel selectable impedance 17 dB minimum return loss Output BNC female connector Clocking options Internal, ±1ppm External, locking over a ±100 ppm range Loop timing (Rx satellite clock)

  • Page 64: Data Interfaces

    CDM-500 Closed Network Satellite Modem Spec Summary Data Interfaces Built in RS422/EIA530 DCE (also supports X.21 DCE and DTE) V.35 DCE Synchronous RS232 (Front panel selectable) Pinout Per EIA530 (25 pin ‘D’ type female) Miscellaneous Front panel Tactile keypad, 6 keys (Up/Down, Left/Right, Enter/Clear)

  • Page 65: Figure A-1 Ber Viterbi Decoding

    Spec Summary CDM-500 Closed Network Satellite Modem Figure A-1 BER Viterbi Decoding A–4 Rev. 1.3...

  • Page 66: Appendix B. Remote Control

    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.

  • Page 67: Eia-232

    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.

  • Page 68: Packet Structure

    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. Packet Structure Controller-to-target: Start of Target...

  • Page 69: Instruction Code

    Remote Control CDM-500 Closed Network Satellite Modem B.5.3 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.

  • Page 70: Message Arguments

    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).
  • Page 71 Remote Control CDM-500 Closed Network Satellite Modem This page is intentionally blank. B–6 Rev. 1.3...
  • Page 72 CDM-500 Closed Network Satellite Modem Remote Control Parameter Command Arguments Description of arguments Response to Query Response to Type (Instruction for Command (note that all arguments are ASCII numeric codes, Command (target to (Instruction query (target Code and or Response to...
  • Page 73 Remote Control CDM-500 Closed Network Satellite Modem Parameter Command Arguments Description of arguments Response to Query Response to Type (Instruction for Command (note that all arguments are ASCII numeric codes, Command (target to (Instruction query (target Code and or Response to...
  • Page 74 CDM-500 Closed Network Satellite Modem Remote Control Parameter Command Arguments Description of arguments Response to Query Response to Type (Instruction for Command (note that all arguments are ASCII numeric codes, Command (target to (Instruction query (target Code and or Response to...
  • Page 75 Remote Control CDM-500 Closed Network Satellite Modem Parameter Command Arguments Description of arguments Response to Query Response to Type (Instruction for Command (note that all arguments are ASCII numeric codes, Command (target to (Instruction query (target Code and or Response to...
  • Page 76 CDM-500 Closed Network Satellite Modem Remote Control Parameter Command Arguments Description of arguments Response to Query Response to Type (Instruction for Command (note that all arguments are ASCII numeric codes, Command (target to (Instruction query (target Code and or Response to...
  • Page 77 Remote Control CDM-500 Closed Network Satellite Modem Parameter Command Arguments Description of arguments Response to Query Response to Type (Instruction for Command (note that all arguments are ASCII numeric codes, Command (target to (Instruction query (target Code and or Response to...
  • Page 78 CDM-500 Closed Network Satellite Modem Remote Control Parameter Command Arguments Description of arguments Response to Query Response to Type (Instruction for Command (note that all arguments are ASCII numeric codes, Command (target to (Instruction query (target Code and or Response to...
  • Page 79 Remote Control CDM-500 Closed Network Satellite Modem Parameter Command Arguments Description of arguments Response to Query Response to Type (Instruction for Command (note that all arguments are ASCII numeric codes, Command (target to (Instruction query (target Code and or Response to...
  • Page 80 CDM-500 Closed Network Satellite Modem Remote Control Parameter Command Arguments Description of arguments Response to Query Response to Type (Instruction for Command (note that all arguments are ASCII numeric codes, Command (target to (Instruction query (target Code and or Response to...
  • Page 81 Modem model number. Example: 0500 is CDM-500 b defines the IF band, with 1 = 70MHz, 2 = 140MHz c defines RX only, with 1 = RX/TX, 2 = RX only Ex: EID=050012 (CDM-500, 70 MHz band, RX only) B–16 Rev. 1.3...
  • Page 82 CDM-500 Closed Network Satellite Modem Remote Control Parameter Command Arguments Description of arguments Response to Query Response to Type (Instruction for Command (note that all arguments are ASCII numeric codes, Command (target to (Instruction query (target Code and or Response to...
  • Page 83 Remote Control CDM-500 Closed Network Satellite Modem This page has been intentionally left blank. B–18 Rev. 1.3...
  • Page 84 Index CONFIG, RX) FRQ (Frequency)...6–9 - A - CONFIG, RX) MOD (Modulation) ..6–8 Address........... B–4 CONFIG, RX) BUF (Buffer size)...6–11 Alarms Connector ........5–2 CONFIG, RX) CLK (Clocking)....6–10 Approvals ..........A–3 CONFIG, RX) Eb/No (Eb/No Alarm) ..6–12 Auxiliary Serial Connector ....5–3 CONFIG, RX) RSI .........6–11 CONFIG, TX) CLK (Clocking).....6–7 - B -...
  • Page 85 Index CDM-500 Satellite Modem End Of Packet ........B–6 - P - Environmental ........vi Exclusive Remedies ....... viii Packet Structure ........B–3 External Clock........7–1 - R - - F - Rear Panel ..........4–3 Front Panel ..........4–1 Receive Clocking ........7–2 Functional Description......

  • Page 86: Metric Conversions

    METRIC CONVERSIONS Units of Length Unit Centimeter Inch Foot Yard Mile Meter Kilometer Millimeter 1 centimeter — 0.3937 0.03281 0.01094 0.01 — — 6.214 x 10 1 inch 2.540 — 0.08333 0.2778 1.578 x 10 0.254 — 25.4 1 foot 30.480 12.0 —...
  • Page 88 2114 85281 WEST TH STREET TEMPE ARIZONA 480 • 333 • 2200 PHONE 480 • 333 • 2161...

This manual is also suitable for:

Mn/cdm500.iom

Table of Contents