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Comtech EF Data CDM-550T Manual

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CDM-550T
Satellite Modem
(Viterbi/Sequential/RS/Turbo)
Installation and Operation Manual
(For Firmware V1.19 or higher)
Part Number MN/CDM550T.IOM
Revision 1.3

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Summary of Contents for Comtech EF Data CDM-550T

  • Page 1 CDM-550T Satellite Modem (Viterbi/Sequential/RS/Turbo) Installation and Operation Manual (For Firmware V1.19 or higher) Part Number MN/CDM550T.IOM Revision 1.3...

  • Page 3: Installation And Operation Manual

    Comtech EF Data is an ISO 9001 Part Number MN/CDM550T.IOM Registered Company. Revision 1.3 July 9, 2001 Copyright © Comtech EF Data, 2000. 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.

  • Page 4: Customer Support

    4. To ensure that the product is not damaged during shipping, pack the product in its original shipping carton/packaging. 5. Ship the product back to Comtech EF Data. (Shipping charges should be prepaid.) For more information regarding the warranty policies, see Warranty Policy, p. xii.

  • Page 5: Table Of Contents

    Table of Contents Customer Support ..............................iii Overview of Changes to Previous Edition ....................... viiiviii About this Manual ............................. viiiviii Conventions and References ..........................viiiviii Metric Conversion............................viiiviii Cautions and Warnings ........................... viiiviii Recommended Standard Designations ......................... ixix Reporting Comments or Suggestions Concerning this Manual................ixix Safety Notices ................................
  • Page 6 Preface CDM-550T Satellite Modem Compatibility ..............................1–3 New in This Release............................1–4 CHAPTER 2. INSTALLATION..................2–1 Unpacking ..............................2–1 Mounting ..............................2–1 Configuration..............................2–2 Select Internal IF Loop ..........................2–2 Connect External Cables..........................2–2 CHAPTER 3. FUNCTIONAL DESCRIPTION ............. 3–1 CHAPTER 4. PHYSICAL DESCRIPTION ..............4–1 Front Panel..............................4–2 Rear Panel ..............................4–3...
  • Page 7 CDM-550T Satellite Modem Preface Introduction ..............................7–1 Viterbi................................7–1 Sequential ..............................7–2 Reed-Solomon Outer Codec (Option) .......................7–3 Turbo Product Codec (Option) .........................7–4 7.1.1 End-to-End Processing Delay ......................7–6 Uncoded Operation (No FEC) ........................7–7 CHAPTER 8. OFFSET QPSK OPERATION .............. 8–1 CHAPTER 9. EIA-232 DATA INTERFACE - ASYNCHRONOUS OPERATION ..9–1 Introduction ..............................9–1...
  • Page 8 Preface CDM-550T Satellite Modem CHAPTER 12. AUTOMATIC UPLINK POWER CONTROL ........12–1 12.1 Introduction............................12–1 12.2 Setting AUPC Parameters ........................12–2 12.2.1 Target Eb/No ..........................12–2 12.2.2 Max Range ............................12–2 12.2.3 Alarm.............................12–3 12.2.4 Demod Unlock ..........................12–3 12.3 Compensation Rate ..........................12–3 12.4 Monitoring ............................12–4 CHAPTER 13.
  • Page 9 FIGURE 7-5 VITERBI WITH CONCATENATED RS 2200,200 OUTER CODE ..........7–13 FIGURE 7-6 VITERBI WITH CONCATENATED RS 2200,200 OUTER CODE 512 KBPS ......7–14 FIGURE 7-7 COMTECH EF DATA TURBO PRODUCT CODEC RATE 3/4 QPSK/OQPSK, RATE 21/44 BPSK, RATE 5/16 BPSK......................7–15 FIGURE 7-8 DIFFERENTIAL ENCODING - NO FEC ..................7–16 FIGURE 10-1 TX CLOCK MODES........................10–4...

  • Page 10: Overview Of Changes To Previous Edition

    About this Manual This manual provides installation and operation information for the Comtech EF Data CDM-550T satellite modem. This is a technical document intended for earth station engineers, technicians, and operators responsible for the operation and maintenance of the CDM-550T.

  • Page 11: Recommended Standard Designations

    The user should observe the following instructions: Fuses The CDM-550T 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 12: Environmental

    The equipment is not designed for connection to power system which has no direct connection to ground. The CDM-550T 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 13 CDM-550T Satellite Modem Preface Immunity: EN 50082 Part 1 - Generic immunity standard, Part 1: Domestic, commercial and light industrial environment. In order that the Modem continues to comply with these standards, observe the following instructions: • Connections to the transmit and receive IF ports (BNC female connectors) should be made using a good quality coaxial cable - for example RG58/U (50 ohm) or RG59/U (75 ohm).

  • Page 14: Warranty Policy

    Disclaimer Comtech EF Data has reviewed this manual thoroughly in order that it will be an easy-to- use guide to your equipment. All statements, technical information, and recommendations in this manual and in any guides or related documents are believed...

  • Page 15: Chapter 1. Introduction

    Standard Features IF port impedance is selectable from the front panel. Users may choose between the universal standard of 50 ohms or the less frequently used 75 ohms. The CDM-550T offers both impedances in the same unit as a standard feature.

  • Page 16: Aupc

    1.1.1 AUPC An important innovation in the CDM-550T is the addition of Automatic Uplink Power Control (AUPC). This feature enables the modem to automatically adjust its output power to maintain the Eb/No of the remote end of the satellite link constant. This provides protection against rain fading, a particularly severe problem with Ku-band links.

  • Page 17: Data Interfaces

    Compatibility For 1:1 applications the CDM-550T is supported by a low-cost external switch, the CRS- 100. For Hub applications, the CDM-550T is supported by a low-cost 1:N switch, the CRS-200. Its fast acquisition time makes it attractive for both demand-assigned and fixed-assigned SCPC applications.

  • Page 18: New In This Release

    5/16 - both operating in BPSK only. • If you do not have Version 1.15, or higher, installed in your CDM-550T, please contact the factory for a free upgrade. Please note the following two new features provided in the Version 1.10 firmware: 1.

  • Page 19: Chapter 2. Installation

    Mounting If the CDM-550T is to be mounted in a rack, ensure that there is adequate clearance for ventilation. The CDM-550T 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 20: Configuration

    CDM-550T Satellite Modem Note that the CDM-550T 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 21: Chapter 3. Functional Description

    Chapter 3. FUNCTIONAL DESCRIPTION The CDM-550T 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 22 Functional Description CDM-550T Satellite Modem This page is intentionally blank. 3–2 Rev. 1.3...

  • Page 23: Chapter 4. Physical Description

    Chapter 4. PHYSICAL DESCRIPTION The CDM-550T is constructed as a 1U high rack-mounting chassis, which can be free- standing, if desired. Rack handles at the front facilitate removal from and placement into a rack. Figure 4-1 shows the front and rear panels of the modem.

  • Page 24: Front Panel

    Physical Description CDM-550T Satellite Modem 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. The LEDs indicate, in a summary fashion, the status of the unit.

  • Page 25: Rear Panel

    Physical Description Rear Panel External cables are attached to connectors on the rear panel of the CDM-550T. 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 26 Physical Description CDM-550T Satellite Modem The pinout details for this connector are provided in the next section. The Remote Control connector is a 9 pin 'D' type female (DB9-M). Access is provided to remote control ports of the modem, both RS232 and RS485. The pinout details for this connector are provided in the next section.

  • Page 27: Chapter 5. Connector Pinouts

    Chapter 5. CONNECTOR PINOUTS Data Connector 25 Pin ‘D’ Type Female Table 5-1 Data Connector - 25 Pin ‘D’ Type Female Generic Signal description Direction EIA-422/ V.35 EIA-232 Circuit EIA 530 Shield Shield Transmit Data A DTE to Modem SD A SD A Receive Data A Modem to DTE...

  • Page 28: Alarms Connector - 15 Pin 'D' Type Male

    Connector Pinouts CDM-550T Satellite Modem Alarms Connector - 15 Pin ‘D’ Type Male Table 5-2 Alarms Connector - 15 Pin ‘D’ Type Male Description Ground Receive AGC voltage Receive Q sample (for constellation display) Unit Fault Relay - Common Unit Fault Relay - Normally Open...

  • Page 29: Auxiliary Serial Connector - He1402 3 Pin Header

    CDM-550T Satellite Modem Connector Pinouts Auxiliary Serial Connector - HE1402 3 Pin Header Table 5-4 Auxiliary Serial Connector - HE1402 3 Pin Header Description EIA-232 Transmit Data (Output) Ground EIA-232 Receive Data (Input) PIN NUMBERING: Looking at the rear panel, pin 1 is on the right-hand side : •...
  • Page 30 Connector Pinouts CDM-550T Satellite Modem This page is intentionally blank. 5–4 Rev. 1.3...

  • Page 31: Chapter 6. Front Panel Operation

    FRONT PANEL OPERATION Description The user can fully control and monitor the operation of the CDM-550T 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 32: Menu Trees

    Menu Trees Figure 6-2 shows the menu structure of the CDM-550T. The detailed screens and menus will now be described. Note: The ‘level’ of the menu (how far down into the structure) is indicated by how far the screen is indented from the left.
  • Page 33 CDM-550T Satellite Modem Front Panel Operation Figure 6-2. Principle Menu Trees Rev. 1.3 6–3...

  • Page 34: Select

    Front Panel Operation CDM-550T Satellite Modem 6.2.2 Select SELECT: CONFIG TEST INFO MONIT STORE/LD UTIL ODU The user is presented with the following choices: CONFIG (Configuration) This menu branch permits the user to fully configure the unit. TEST This menu branch permits the user invoke one of several test modes (loopbacks, for example).

  • Page 35: Config

    ‘all ones’ as an idle pattern. However, by convention, the ‘all ones’ condition is taken to be the Alarm Indication Signal (AIS). The CDM-550T monitors for the AIS condition, and if desired, this alarm may be masked. IMPED (Impedance) This menu sub-branch permits the user to define the impedance at the IF connectors, either 50 or 75 ohms.
  • Page 36 Front Panel Operation CDM-550T Satellite Modem 6.2.3.1 (CONFIG) TX (Transmit) TX: MOD FREQ DATA ON/OFF PWR SCRAM CLK TSI The sub-branches available are: (CONFIG, TX) MOD (Modulation) SELECT TX MODULATION: BPSK QPSK OQPSK (ENTER) Select BPSK, QPSK, or Offset QPSK modulation, using the LEFT/RIGHT arrow keys, then press ENTER.
  • Page 37 CDM-550T Satellite Modem Front Panel Operation (CONFIG, TX) DATA (Data Rate) EDIT TX DATA RATE: 2048.000 kbps(PRESS ENT) Edit the transmit data rate. This is accomplished by selecting the digit to be edited, using the LEFT/RIGHT arrow keys. The value of the digit is then changed using the UP/DOWN arrow keys.
  • Page 38 Front Panel Operation CDM-550T Satellite Modem (CONFIG, TX, FEC) Select Viterbi, Sequential, Viterbi + concatenated Reed-Solomon, Sequential + concatenated Reed-Solomon, or None, using the LEFT/RIGHT arrow keys, then press ENTER. If the Turbo Codec option is installed, the following menu will be displayed:...
  • Page 39 CDM-550T Satellite Modem Front Panel Operation TX TURBO:3/4(Q) 21/44(B) 5/16(B) 3/4(OQ) (ENTER) (CONFIG, TX, FEC, RATE) FEC Rate (Turbo Only) Select Rate 3/4 (QPSK), Rate 21/44 (BPSK ONLY) Rate 5/16 (BPSK ONLY) or Rate 3/4 (OQPSK) encoding rate, using the LEFT/RIGHT arrow keys, then press ENTER.
  • Page 40 Front Panel Operation CDM-550T Satellite Modem (CONFIG, TX, PWR) MODE OUTPUT POWER LEVEL MODE: MANUAL AUPC (ENTER) Select the output power level mode, either Manual or AUPC, then press ENTER. If the user selects MANUAL, the following menu is displayed:...
  • Page 41 CDM-550T Satellite Modem Front Panel Operation (CONFIG, TX, PWR, MODE) AUPC TARGET EbNo MAX RANGE ALARM DEMOD-UNLOCK(ENT) Select either TARGET EbNo, MAX RANGE, ALARM or DEMOD-UNLOCK. The user should then press ENTER. (CONFIG, TX, PWR, MODE, AUPC) TARGET EbNo EDIT TARGET MIN EbNo OF REMOTE MODEM:9.9dB (ENT)
  • Page 42 Front Panel Operation CDM-550T Satellite Modem (CONFIG, TX, PWR, MODE, AUPC) ALARM SELECT ACTION AT MAXIMUM TX POWER: NONE TX ALARM Select the action that will occur if the AUPC causes the maximum output power level to be reached, either NONE or TX ALARM. Then press ENTER.
  • Page 43 Select INT (Internal), EXT (External) or LOOP-TIMED, using the LEFT/RIGHT arrow keys, then press ENTER. INTERNAL indicates that the CDM-550T will supply a clock to the DTE, which is derived from its internal high-stability source. EXTERNAL indicates that the CDM-550T expects to receive a clock from the DTE, to which the unit can phase-lock its internal circuits.
  • Page 44 Front Panel Operation CDM-550T Satellite Modem (CONFIG, TX) TSI (Transmit Spectral Invert) SELECT TRANSMIT SPECTRAL INVERSION: OFF ON(ENTER) Select either OFF or ON, using the LEFT/RIGHT arrow keys, then press ENTER. When in the ON position, and QPSK is selected, the transmit spectrum is inverted (which is the same as reversing the direction of phase rotation in the modulator).
  • Page 45 CDM-550T Satellite Modem Front Panel Operation (CONFIG, RX) FRQ (Frequency) EDIT RX FREQUENCY: 72.2345 MHz (PRESS ENT) Edit the receive frequency. This is accomplished by selecting the digit to be edited, using the LEFT/RIGHT arrow keys. The value of the digit is then changed using the UP/DOWN arrow keys.
  • Page 46 Front Panel Operation CDM-550T Satellite Modem However, if the Reed-Solomon Codec option is installed, the following menu will be displayed: SELECT FEC TYPE: VIT SEQ VIT+RS SEQ+RS NONE (ENT) Select Viterbi, Sequential, Viterbi + concatenated Reed-Solomon, Sequential + concatenated Reed-Solomon, or None, using the LEFT/RIGHT arrow keys, then press ENTER.
  • Page 47 CDM-550T Satellite Modem Front Panel Operation (CONFIG, RX, FEC, RATE) FEC RATE (TURBO ONLY) RX TURBO: 3/4(Q) 21/44(B) 5/16(B) 3/4(OQ) (ENTER) Select Rate 3/4 (QPSK), Rate 21/44 (BPSK ONLY) Rate 5/16 (BPSK ONLY) , or Rate 3/4 (OQPSK) decoding rate, using the LEFT/RIGHT arrow keys, then press ENTER.
  • Page 48 The CDM-550T can be operated with independent transmit receive and transmit data rates. Even in this configuration, where RX data rate <> TX data rate, the output clock for the buffer will be phase locked to the transmit clock.
  • Page 49 CDM-550T Satellite Modem Front Panel Operation (CONFIG, RX) BUF (Buffer size) EDIT RX BUFFER SIZE: +/-4096 BITS (PRESS ENT) Edit the size, in bits of the Plesiochronous/Doppler Buffer. The value is changed using the UP/DOWN arrow keys. The user should then press ENTER. Values of +/- 256, 512, 1024, 2048 and 4096 bits are possible.

  • Page 50: Important Note

    Front Panel Operation CDM-550T Satellite Modem (CONFIG) FRAME (Framing Mode) SELECT FRAMING MODE: TRANSPARENT FRAMED (ENT) The sub-branches available are: (CONFIG, FRAME) TRANSPARENT No framing is selected. No overhead is added, and the unit will be compatible with other manufacturer’s equipment, when operating in a ‘standard’...
  • Page 51 CDM-550T Satellite Modem Front Panel Operation (CONFIG, FRAME, FRAMED) EDMAC-ON SELECT EDMAC MODE: MASTER SLAVE (ENTER) Select either MASTER or SLAVE, using the LEFT/RIGHT arrow keys, then press ENTER. An EDMAC MASTER is a unit which is local to the M&C computer, and which passes messages, via the overhead, to a distant-end modem.
  • Page 52 Front Panel Operation CDM-550T Satellite Modem (CONFIG, FRAME, FRAMED, ON) EDMAC SLAVE EDIT THIS UNIT'S ADDRESS 0245 (SEE HANDBOOK)(ENT) Edit the address of this SLAVE unit. This is accomplished by selecting the digit to be edited, using the LEFT/RIGHT arrow keys. The value of the digit is then changed using the UP/DOWN arrow keys.
  • Page 53 CDM-550T Satellite Modem Front Panel Operation (CONFIG, LOCAL) If LOCAL is selected then remote control will be disabled. Remote monitoring is still possible. (CONFIG, REMOTE) If REMOTE is selected then the following sub-menus will be displayed: If the unit has not been defined as an EDMAC SLAVE then:\...
  • Page 54 Front Panel Operation CDM-550T Satellite Modem (CONFIG, REMOTE, INTFC) If INTERFACE is selected: ELECT. INTERFACE: RS232 RS485-2W RS485-4W (ENT) Select RS232, RS485 (2-wire), or RS485 (4-wire), using the LEFT/RIGHT arrow keys, then press ENTER. At this point the user will be further prompted to enter the bus address.
  • Page 55 CDM-550T Satellite Modem Front Panel Operation 6.2.3.5 (CONFIG) MASK (Alarm mask) ALARM MASK: Eb/No RX-AIS BUF-SLIP TX-AIS Select AGC, Eb/No, RX-AIS, BUF-SLIP, or TX-AIS, using the LEFT/RIGHT arrow keys, then press ENTER. One of the following sub-menus will be displayed:...
  • Page 56 Front Panel Operation CDM-550T Satellite Modem (CONFIG, MASK) RX-AIS SEL RX-AIS ALARM MASK: ACTIVE MASKED(PRESS ENT) Select either ACTIVE or MASKED, using the LEFT/RIGHT arrow keys, then press ENTER. If the user selects ACTIVE, then a Receive Traffic fault will be generated whenever the demodulator senses that the ‘all ones’...
  • Page 57 CDM-550T Satellite Modem Front Panel Operation (CONFIG, MASK) TX-AIS SEL TX-AIS ALARM MASK: ACTIVE MASKED(PRESS ENT) Select either ACTIVE or MASKED, using the LEFT/RIGHT arrow keys, then press ENTER. If the user selects ACTIVE, then a Transmit Traffic fault will be generated whenever the transmit circuitry senses that the ‘all ones’...

  • Page 58: Test

    Front Panel Operation CDM-550T Satellite Modem 6.2.4 TEST TEST: NORM TX-CW TX-1,0 IF] DIG] I/O] RF] (ENT) Select NORM, TX-CW, TX-1,0, IF LOOP, DIG LOOP, I/O LOOP or RF LOOP, using the LEFT/RIGHT arrow keys, then press ENTER. This sub-menu permits the user to select the following test modes:...
  • Page 59 CDM-550T Satellite Modem Front Panel Operation Figure 6-2. Loopback Modes Rev. 1.3 6–29...

  • Page 60: Info (Information)

    Front Panel Operation CDM-550T Satellite Modem 6.2.5 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 61 CDM-550T Satellite Modem Front Panel Operation 6.2.5.3 (INFO) RX (Receive information) Rx: 70.0000 512.000 SEQ B R3/4 BUFF +/-23k I The information displayed here is as follows: Top line: Receive Frequency Receive Data Rate FEC Decoder type (VIT = Viterbi, SEQ = Sequential, VRS=Viterbi + Reed-...
  • Page 62 Front Panel Operation CDM-550T Satellite Modem 6.2.5.6 (INFO) REMCONT (Remote Control information) REM-CONTROL:ON RS485-4W ADDRESS: 0001 19200 BAUD This screen shows if the unit is in LOCAL or REMOTE mode, and gives details of the electrical interface type selected, the unit’s address, and the baud rate selected.

  • Page 63: Monit (Monitor)

    CDM-550T Satellite Modem Front Panel Operation 6.2.6 MONIT (Monitor) MONITOR:ALARMS RX-PARAMS STORED-EVENTS STATS AUPC Select ALARMS, RX-PARAMS, STORED EVENTS, STATS, or AUPC or using the LEFT/RIGHT arrow keys, then press ENTER. If the user selects ALARMS, the following sub-menu is displayed: 6.2.6.1...
  • Page 64 Front Panel Operation CDM-550T Satellite Modem (MON, ALARMS) RECEIVE (Receive alarms) RX TRAFFIC: AGC ALARM REDUCE COMPOSITE I/P LVL The screen will indicate if there are any Receive Traffic Faults. If not, it will display ‘NONE’. Pressing ENTER takes the user back to the previous menu.
  • Page 65 CDM-550T Satellite Modem Front Panel Operation If the user selects STORED EVENTS, the following sub-menu is displayed: 6.2.6.3 (MONIT) STORED EVENTS STORED EVENTS: VIEW CLEAR ALL (PRESS ENTER) Select VIEW or CLEAR ALL, using the LEFT/RIGHT arrow keys, then press ENTER.
  • Page 66 Front Panel Operation CDM-550T Satellite Modem If the user selects STATS, the following sub-menu is displayed: LINK STATISTICS: VIEW CLEAR CONFIGURE (ENTER) MONIT) STATS (Link Statisics) Select VIEW, CLEAR, or CONFIGURE, using the LEFT/RIGHT arrow keys, then press ENTER. If the user selects VIEW, the following screen is displayed:...
  • Page 67 CDM-550T Satellite Modem Front Panel Operation Notes: If the demod has lost lock during the measurement interval, the minimum Eb/No will show ‘LOSS’ rather than indicate a value. However, the average value (while the demod was locked) will still be calculated and shown. If, on the other hand, the demodulator has been unlocked for the entire measurement interval, the average Eb/No will also show ‘LOSS’.

  • Page 68: Store/Ld (Store/Load)

    Front Panel Operation CDM-550T Satellite Modem 6.2.6.4 (MONITOR) AUPC FRAMING NOT ENABLED! (PRESS ENTER) If AUPC is selected, and the modem is in Framed mode, the following sub-menu is displayed: AUPC: REMOTE EbNo=14.0dB TX POWER INCREASE=2.2dB The top line displays the value of Eb/No of the demodulator at the distant end of the satellite link.
  • Page 69 CDM-550T Satellite Modem Front Panel Operation 6.2.7.1 (STORE/LD) STORE STORE CONFIGURATION TO LOCATION: (ENTER) Select the location to store the current configuration to, using the UP/DOWN arrow keys, then press ENTER. Locations 1 through 10 are available. If the selected location does not contain a previously stored configuration, the...
  • Page 70 Front Panel Operation CDM-550T Satellite Modem 6.2.7.2 (STO/LD) LOAD LOAD CONFIGURATION FROM LOCATION: (ENTER) 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...

  • Page 71: Util (Utility)

    CDM-550T Satellite Modem Front Panel Operation 6.2.8 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...
  • Page 72 Front Panel Operation CDM-550T Satellite Modem 6.2.8.2 (UTIL) MAN-1:1 (Manual 1:1 switchover) PRESS ENT TO FORCE THIS UNIT TO STDBY (1:1 ONLY) If the unit is part of a 1:1 redundant pair of modems, and this unit, is currently on-line, pressing ENTER will cause the unit to switch to standby.

  • Page 73: Viterbi

    The second option is Comtech EF Data’s Turbo Product Codec, which is an entirely stand-alone method of FEC. This too is a small daughter card.

  • Page 74: Sequential

    Eb/No). This is not true of the Sequential decoding method, as explained in the section below. Note that in BPSK mode, the CDM-550T only permits a coding rate of 1/2. Because the method of convolutional coding used with Viterbi, the encoder does not preserve the original data intact, and is called non-systematic.

  • Page 75: Reed-Solomon Outer Codec (Option)

    RS decoder do not exceed its capacity to correct those errors. In the case of the CDM-550T, two RS code rates are used. A 220,200 code is used in transparent modes, and a 200,180 code is used in framed (EDMAC) modes. (220,200 means that data is put into blocks of 220 bytes, of which 200 bytes are data, and 20 bytes are FEC overhead.) These two codes were chosen because they fit well into Comtech EF...

  • Page 76: Turbo Product Codec (Option)

    This may be due to the carrier-recovery circuits, or the synchronization threshold of the primary FEC device, or both. In the CDM-550T, and Rate 1/2 operation, this threshold is around 4 dB Eb/No. Below this value, operation is not possible, but above this value, the error performance of the concatenated RS system produces exceptionally low error rates for a very small increase in Eb/No.
  • Page 77 However, with Firmware Version 1.15 (and later) Comtech EF Data has introduced two further code rates - Rate 21/44 BPSK (very close to Rate 1/2) and Rate 5/16 BPSK (very close to Rate 1/3).

  • Page 78: End-To-End Processing Delay

    In many cases, FEC methods which provide increased coding gain do so at the expense of increased processing delay. However, with TPC, this increase in delay is very modest. The table below shows, for the CDM-550T, the processing delays for the major FEC types, including the three TPC modes:...

  • Page 79: Uncoded Operation (No Fec)

    There are occasions where a user may wish to operate a satellite link with no forward error correction of any kind. For this reason, the CDM-550T offers this uncoded mode for all three modulation types - BPSK, QPSK and OQPSK. However, the user should be aware of some of the implications of using this approach.
  • Page 80 However, if uncoded operation is used, there is no way to recognize a data false lock. The demodulator will indicate that it is correctly locked, but the data out will not be correct. Comtech EF Data strongly cautions users when using uncoded operation. If the acquisition sweep width exceeds one quarter of the symbol rate, there is a very high probability that the demodulator will false lock.

  • Page 81: Figure 7-1 Viterbi Decoding

    CDM-550T Satellite Modem Forward Error Correction Options Eb/No in dB 1E-1 Uncoded BPSK/QPSK 1E-2 Viterbi Decoding Typical Performance 1E-3 1E-4 1E-5 1E-6 Specification limit, Rate 7/8 1E-7 Coding 1E-8 Specification Specification limit Rate 1/2 limit, Rate 3/4 Coding Coding 1E-9 Figure 7-1 Viterbi Decoding Rev.

  • Page 82: Figure 7-2 Sequential Decoding 64 Kbps

    Forward Error Correction Options CDM-550T Satellite Modem Eb/No in dB 1E-1 Uncoded BPSK/QPSK Sequential 1E-2 Decoding 64 kbps Typical 1E-3 Performance 1E-4 1E-5 1E-6 Specification 1E-7 limit, Rate 7/8 Coding 1E-8 Specification Specification limit Rate 1/2 limit, Rate 3/4 Coding...

  • Page 83: Figure 7-3 Sequential Decoding 1024 Kbps

    CDM-550T Satellite Modem Forward Error Correction Options Eb/No in dB 1E-1 Uncoded BPSK/QPSK Sequential 1E-2 Decoding 1024 kbps 1E-3 Typical Performance 1E-4 1E-5 1E-6 Specification 1E-7 limit, Rate 7/8 Coding 1E-8 Specification limit Rate 1/2 Specification Coding limit, Rate 3/4...

  • Page 84: Figure 7-4 Sequential Decoding 2048 Kbps

    Forward Error Correction Options CDM-550T Satellite Modem Eb/No in dB 1E-1 Uncoded BPSK/QPSK Sequential 1E-2 Decoding 2048 kbps 1E-3 1E-4 1E-5 1E-6 Typical performance, Rate 7/8 Coding 1E-7 1E-8 Typical Typical performance, performance, Rate 3/4 Rate 1/2 Coding Coding 1E-9 Figure 7-4 Sequential Decoding 2048 kbps 7–12...

  • Page 85: Figure 7-5 Viterbi With Concatenated Rs 2200,200 Outer Code

    CDM-550T Satellite Modem Forward Error Correction Options Eb/No in dB 1E-1 Uncoded BPSK/QPSK Viterbi with 1E-2 concatenated RS 220,200 Sync threshold, Outer Code Rate 3/4 1E-3 Sync threshold, Rate 7/8 1E-4 Combined sync 1E-5 threshold, demod and Viterbi Decoder, Rate 1/2...

  • Page 86: Figure 7-6 Viterbi With Concatenated Rs 2200,200 Outer Code 512 Kbps

    Forward Error Correction Options CDM-550T Satellite Modem Eb/No in dB 1E-1 Uncoded BPSK/QPSK Sequential with 1E-2 concatenated RS 220,200 Outer Code 1E-3 512 kbps 1E-4 Combined sync threshold, demod and Sequential 1E-5 Decoder, Rate 1/2 Sync threshold, Rate 3/4 Specification...

  • Page 87: Figure 7-7 Comtech Ef Data Turbo Product Codec Rate 3/4 Qpsk/Oqpsk, Rate 21/44 Bpsk, Rate 5/16 Bpsk

    - Rate 5/16 BPSK 1E-4 1E-5 1E-6 1E-7 Typical performance is approximately 0.3 dB better than shown 1E-8 1E-9 Figure 7-7 Comtech EF Data Turbo Product Codec Rate 3/4 QPSK/OQPSK, Rate 21/44 BPSK, Rate 5/16 BPSK Rev. 1.3 7–15...

  • Page 88: Figure 7-8 Differential Encoding - No Fec

    Forward Error Correction Options CDM-550T Satellite Modem Eb/No in dB 1E-1 Differential Encoding - No FEC Uncoded BPSK/QPSK 1E-2 1E-3 1E-4 1E-5 1E-6 1E-7 1E-8 1E-9 Figure 7-8 Differential Encoding - No FEC 7–16 Rev. 1.3...

  • Page 89: Chapter 8. Offset Qpsk Operation

    Chapter 8. OFFSET QPSK OPERATION Offset QPSK modulation is a variation of normal QPSK, which is offered in the CDM- 550T. Normal, bandlimited, QPSK produces an RF signal envelope which necessarily goes through a point of zero amplitude when the modulator transitions through non- adjacent phase states.
  • Page 90 Offset Qpsk Operation CDM-550T Satellite Modem The demodulator must re-align the I and Q symbol streams before the process of carrier recovery can take place. For various reasons this makes the process of acquisition more difficult. The two consequences of this are: 1) Acquisition may be longer, especially at low data rates.

  • Page 91: Chapter 9. Eia-232 Data Interface - Asynchronous Operation

    ASYNCHRONOUS OPERATION Introduction The CDM-550T supports asynchronous RS232 in addition to synchronous RS232 formats. This is useful, for example, in connecting two computers together, via their serial ports, at opposite ends of a satellite link. There are, however, some restrictions and limitations when using this mode, and the user may have to experiment a little in order to get reliable communication.

  • Page 92: Setup

    EIA-232 Data Interface - Asynchronous Operation CDM-550T Satellite Modem Setup The setup required for this mode is remarkably simple. Select RS232 as the interface type, and then select the required baud rate for both transmit and receive data rates. Detection of the asynchronous mode is fully automatic. If no clock is detected, asynchronous mode is assumed, and the internal circuitry is switched accordingly.

  • Page 93: Chapter 10. Clocking

    Chapter 10. 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-550T. 10.1 Transmit Clocking There are four transmit clocking modes in the CDM-550T. EIA-422/449 signal mnemonics will be used for illustration, but the description applies equally to V.35, and...

  • Page 94: Loop-Timed, Rx=Tx

    10.1.4 Loop-Timed, RX<>TX (Asymmetric Loop Timing) The CDM-550T incorporates circuitry which permits loop timing when the TX and RX data rates are not the same. In this case the clock frequency appearing at ST will be whatever the TX data rate is programmed to, but phase-locked to the demodulator’s receive symbol clock.

  • Page 95: Buffer Enabled, Rx<>Tx

    10.4 Loop Timing With Sync EIA-232 The CDM-550T distinguishes between synchronous and asynchronous EIA-232 by detecting clock activity on the TX Clock pin of the interface. If no clock is detected, it is assumed that the mode is asynchronous. Therefore, if loop timing is employed in a synchronous EIA-232 application, it is essential to provide an external loop between the ST and TX clock pins.

  • Page 96: Figure 10-1 Tx Clock Modes

    Clocking CDM-550T Satellite Modem Figure 10-1 Tx Clock Modes 10–4 Rev. 1.3...

  • Page 97: Figure 10-2 Rx Clock Modes

    CDM-550T Satellite Modem Clocking Figure 10-2 RX Clock Modes Rev. 1.3 10–5...
  • Page 98 Clocking CDM-550T Satellite Modem This page has been intentionally left blank. 10–6 Rev. 1.3...

  • Page 99: Chapter 11. Edmac Channel

    Chapter 11. EDMAC CHANNEL 11.1 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.

  • Page 100: M&C Connection

    EDMAC Channel CDM-550T Satellite Modem of the descrambler, 3 output errors are generated. However, there is an alternative when the data is in a framed format. In this case, a different class of scrambler may be used - one which uses the start of frame information to start the scrambling process at an exact known state.

  • Page 101: Setup Summary

    CDM-550T Satellite Modem EDMAC Channel path on the satellite link. The EDMAC Master assembles the complete packet, and transmits the response back to the M&C Computer. Apart from the round-trip satellite delay, the M&C Computer does not see any difference between local and distant-end units - it sends out a packet, addressed to a particular unit, and gets back a response.
  • Page 102 EDMAC Channel CDM-550T Satellite Modem This page has been intentionally left blank. 11–4 Rev. 1.3...

  • Page 103: Chapter 12. Automatic Uplink Power Control

    Chapter 12. AUTOMATIC UPLINK POWER CONTROL 12.1 Introduction Automatic Uplink Power Control (AUPC) is a feature whereby a local modem is permitted to adjust its own output power level in order to attempt to maintain the Eb/No at the remote modem. ! ! ! IMPORTANT WARNING ! ! ! The user MUST obtain permission from the Satellite Operator to use this feature.

  • Page 104: Setting Aupc Parameters

    Automatic Uplink Power Control (AUPC) CDM-550T Satellite Modem 12.2 Setting AUPC Parameters 1) The user, under the menu (CONFIG, FRAME) first ensures that Framed mode is selected. EDMAC may be disabled, or the unit may be defined as an EDMAC Master or Slave.

  • Page 105: Alarm

    CDM-550T Satellite Modem Automatic Uplink Power Control (AUPC) 12.2.3 Alarm This parameter defines how the user wants the modem to act if, under AUPC control, the maximum power limit is reached. The two choices are: NONE (no action) TX ALARM (generate a TX alarm) The default setting is NONE.

  • Page 106: Monitoring

    Automatic Uplink Power Control (AUPC) CDM-550T Satellite Modem 12.4 Monitoring The remote demodulator’s value of Eb/No can be monitored at all times, either from the front panel (MONIT, AUPC) or via the remote control interface. The resolution of the reading is 0.2 dB. For all values greater than or equal to 16 dB, the value 16.0 dB will be displayed.

  • Page 107: Chapter 13. Flash Upgrading

    Chapter 13. FLASH UPGRADING The CDM-550T eliminates the need for updating firmware by physically replacing EPROMs. Instead, the CDM-550T modem uses ‘flash memory’ technology internally, and new firmware can be uploaded to the unit from an external PC. This makes software upgrading very simple, and updates can now be sent via the Internet, E-mail, or on disk.
  • Page 108 Flash Upgrading CDM-550T Satellite Modem This page is intentionally blank. 13–2 Rev. 1.3...

  • Page 109: Chapter 14. Summary Of Specifications

    Chapter 14. SUMMARY OF SPECIFICATIONS 14.1 MODULATOR Modulation BPSK, QPSK, and Offset QPSK Overall, 2.4 - 2048 kbps Data rate range 4.8 kbps - 2048 kbps, Uncoded BPSK 9.6 kbps - 2048 kbps, Uncoded QPSK/OQPSK 2.4 kbps - 1024 kbps, Rate 1/2 BPSK 4.8 kbps - 2048 kbps, Rate 1/2 QPSK/OQPSK 7.2 kbps - 2048 kbps, Rate 3/4 QPSK/OQPSK 8.4 kbps - 2048 kbps, Rate 7/8 QPSK/OQPSK...

  • Page 110: Demodulator

    Summary Of Specifications CDM-550T Satellite Modem None: Uncoded BPSK/QPSK/OQPSK Viterbi: k=7, per IESS 308/309 BPSK: Rate 1/2 QPSK/OQPSK: Rate 1/2, Rate 3/4 and Rate 7/8 Sequential: k=36 (Rate 1/2) per IESS 309 k= 63 (Rate 3/4) per IESS 309 k= 87 (Rate 7/8)
  • Page 111 CDM-550T Satellite Modem Summary Of Specifications Clock tracking range ± 100 ppm min VITERBI BER Rate 1/2 Rate 3/4 Rate 7/8 Guaranteed Guaranteed Guaranteed Eb/No: performance (met in the presence Eb/No: Eb/No: (typical value in of two adjacent (typical value in...

  • Page 112: Automatic Uplink Power Control

    Asynchronous EIA-232 (maximum data rate: 56 kbaud) (Front panel selectable) Pinout Per EIA-530 (25 pin ‘D’ type female) Optional G.703 T1/E1 plug-on interface (Comtech EF Data P/N: CIC-50) 14.5 Miscellaneous Front panel Tactile keypad, 6 keys (Up/Down, Left/Right, Enter/Clear) Vacuum Fluorescent Display (blue) - 2 lines of 24 characters...

  • Page 113: Async Overhead

    CDM-550T Satellite Modem Summary Of Specifications 14.6 Async Overhead Electrical Interface EIA-232 (Rx Data, Tx Data, and ground no flow control) 8 data bits, no parity, 1 stop bit, (8-N-1) – full duplex Async format Baud Rates Main channel data rate versus async channel baud rate (All modes except 21/44 and 5/16 Turbo) <50 kbps - option disabled...
  • Page 114 Summary Of Specifications CDM-550T Satellite Modem Typical Coarse AGC voltage Characteristic Composite input level Alarm Threshold For input levels < -40 dBm AGC functions are performed in the digital demod For Symbol Rates >300 ksym/sec IF BW = 3.5 MHz For Symbol Rates >...

  • Page 115: Chapter 15. Remote Control

    Chapter 15. REMOTE CONTROL 15.1 Introduction This section describes the protocol and message command set for remote monitor and control of the CDM-550 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 116: Basic Protocol

    Remote Control CDM-550T 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 117: Packet Structure

    CDM-550T Satellite Modem Remote Control 15.5 Packet Structure Controller-to-target: Start of Packet Target Address Address Instruction Code Optional End of Packet De-limiter Code Qualifier Arguments < = or ? Carriage Return ASCII code 60 ASCII code 47 ASCII code 61...

  • Page 118: Instruction Code

    Remote Control CDM-550T Satellite Modem 15.5.3 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 119: Message Arguments

    CDM-550T 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 120 Remote Control CDM-550T Satellite Modem This page has been intentionally left blank. 15–6 Rev. 1.3...
  • Page 121 CDM-550T Satellite Modem Remote Control Parameter Command Arguments for Description of arguments Response to Command Query Response to query Type (InstructionC Command or (note that all arguments are ASCII numeric codes, that is, (target to controller) (Instruction (target to controller)
  • Page 122 Remote Control CDM-550T Satellite Modem Parameter Command Arguments for Description of arguments Response to Command Query Response to query Type (InstructionC Command or (note that all arguments are ASCII numeric codes, that is, (target to controller) (Instruction (target to controller)
  • Page 123 CDM-550T Satellite Modem Remote Control Parameter Command Arguments for Description of arguments Response to Command Query Response to query Type (InstructionC Command or (note that all arguments are ASCII numeric codes, that is, (target to controller) (Instruction (target to controller)
  • Page 124 Remote Control CDM-550T Satellite Modem Parameter Command Arguments for Description of arguments Response to Command Query Response to query Type (InstructionC Command or (note that all arguments are ASCII numeric codes, that is, (target to controller) (Instruction (target to controller)
  • Page 125 CDM-550T Satellite Modem Remote Control Parameter Command Arguments for Description of arguments Response to Command Query Response to query Type (InstructionC Command or (note that all arguments are ASCII numeric codes, that is, (target to controller) (Instruction (target to controller)
  • Page 126 Remote Control CDM-550T Satellite Modem Parameter Command Arguments for Description of arguments Response to Command Query Response to query Type (InstructionC Command or (note that all arguments are ASCII numeric codes, that is, (target to controller) (Instruction (target to controller)
  • Page 127 CDM-550T Satellite Modem Remote Control Parameter Command Arguments for Description of arguments Response to Command Query Response to query Type (InstructionC Command or (note that all arguments are ASCII numeric codes, that is, (target to controller) (Instruction (target to controller)
  • Page 128 Remote Control CDM-550T Satellite Modem Parameter Command Arguments for Description of arguments Response to Command Query Response to query Type (InstructionC Command or (note that all arguments are ASCII numeric codes, that is, (target to controller) (Instruction (target to controller)
  • Page 129 CDM-550T Satellite Modem Remote Control Parameter Command Arguments for Description of arguments Response to Command Query Response to query Type (InstructionC Command or (note that all arguments are ASCII numeric codes, that is, (target to controller) (Instruction (target to controller)
  • Page 130 Remote Control CDM-550T Satellite Modem Parameter Command Arguments for Description of arguments Response to Command Query Response to query Type (InstructionC Command or (note that all arguments are ASCII numeric codes, that is, (target to controller) (Instruction (target to controller)
  • Page 131 CDM-550T Satellite Modem Remote Control Parameter Command Arguments for Description of arguments Response to Command Query Response to query Type (InstructionC Command or (note that all arguments are ASCII numeric codes, that is, (target to controller) (Instruction (target to controller)
  • Page 132 Remote Control CDM-550T Satellite Modem Parameter Command Arguments for Description of arguments Response to Command Query Response to query Type (InstructionC Command or (note that all arguments are ASCII numeric codes, that is, (target to controller) (Instruction (target to controller)
  • Page 133 CDM-550T Satellite Modem Remote Control Parameter Command Arguments for Description of arguments Response to Command Query Response to query Type (InstructionC Command or (note that all arguments are ASCII numeric codes, that is, (target to controller) (Instruction (target to controller)
  • Page 134 2550 is CDM-550T, no Reed-Solomon or Turbo 3550 is CDM-550T with Reed-Solomon Codec 4550 is CDM-550T with Turbo Codec fitted (Rate 3/4 QPSK only - S/W Version less than 1.15) 5550 is CDM-550T with Turbo Codec fitted (Rate 3/4 QPSK,...
  • Page 135 CDM-550T Satellite Modem Remote Control Parameter Command Arguments for Description of arguments Response to Command Query Response to query Type (InstructionC Command or (note that all arguments are ASCII numeric codes, that is, (target to controller) (Instruction (target to controller)
  • Page 136 Remote Control CDM-550T Satellite Modem This page has been intentionally left blank. 15–22 Rev. 1.3...

  • Page 137: Appendix A. Cable Drawings

    Appendix A. CABLE DRAWINGS The EIA-530 standard pinout (provided on the CDM-550T) is becoming more popular in many applications. However, there are still many occasions when, especially for existing EIA-422/449 and V.35 users, a conversion must be made. For these situations, the following two cable drawings show EIA-530 to EIA-422/449 DCE conversion, and EIA-530 to V.35 DCE conversion.
  • Page 138 Cable Drawings CDM-550T Satellite Modem A–2 Rev. 1.3...
  • Page 139 CDM-550T Satellite Modem Cable Drawings Rev. 1.3 A–3...
  • Page 140 Cable Drawings CDM-550T Satellite Modem A–4 Rev. 1.3...

  • Page 141: Appendix B. Eb/No Measurement

    Appendix B. Eb/No MEASUREMENT Although the CDM-550T calculates and displays the value of receive Eb/No on the front panel of the unit, it is sometimes useful to measure the value using a spectrum analyzer, if one is available. Rev. 1.3...
  • Page 142 Eb/No Measurement CDM-550T Satellite Modem The idea is to accurately measure the value of (C+N)/N, (Carrier + Noise/Noise) and this is accomplished by tuning the center frequency of the Spectrum analyzer to the signal of interest, and measuring the difference between the peak spectral density of the signal (the flat part of the spectrum shown) and the noise density.
  • Page 143 CDM-550T Satellite Modem Eb/No Measurement Eb/No - Eb/No - Eb/No - Eb/No - Eb/No - Eb/No - (C+N)/N Uncoded Rate 1/2 Uncoded Rate 1/2 Rate 3/4 Rate 7/8 BPSK BPSK QPSK QPSK QPSK QPSK 10.3 10.8 11.4 12.0 10.0 12.5 10.5...
  • Page 144 Eb/No Measurement CDM-550T Satellite Modem This page is intentionally left blank. B–4 Rev. 1.3...

  • Page 145: Appendix C. Async Overhead Option

    Appendix C. Async Overhead Option Introduction For many applications the EDMAC channel provides an excellent solution to the problem of communicating with a modem (and possibly a transceiver) at the distant end of a satellite link. However, the EDMAC information remains internal to the equipment, and is not presented to the outside world.

  • Page 146: Electrical Interface

    Async Overhead Option CDM-550T Satellite Modem Electrical Interface The electrical interface is 3-wire EIA-232 (Rx Data, Tx Data, and ground). No flow control is provided. The async character format is fixed at 8 data bits, no parity, 1 stop bit, (8-N-1), full duplex.
  • Page 147 SPECIALS menu. The FACTORY sub-menus contain features and operating modes that may be specific to particular customers of Comtech EF Data, and includes diagnostic modes that may, in certain circumstances, render the modem inoperable. It is our policy, therefore to require a special combination of keystrokes for FACTORY access, which we do not publish.
  • Page 148 Async Overhead Option CDM-550T Satellite Modem This page is intentionally left blank. C–4 Rev. 1.3...
  • Page 149 Index Data Connector - 25 Pin ‘D’ Type Female ... 5–1 About this Manual ...........viii Data Interfaces ............1–3 Address ..............15–3 Data Interfaces ............14–4 Alarm..............12–3 Demod Unlock ............12–3 Alarms Connector - 15 Pin ‘D’ Type Male... 5–1 Demodulator Specifications ........14–2 Approvals..............
  • Page 150 Index CDM-550T Satellite Modem Limitations of Warranty..........xii Safety Notices ............ix Loop Timing With Sync EIA-232 ......10–3 Select Internal IF Loop........... 2–2 Loop-Timed, RX<>TX Select..............6–4 (Asymmetric Loop Timing) ......10–2 Sequential Decoding 64 Kbps ......7–10 Loop-Timed, RX=TX ........... 10–2 Sequential Decoding 1024 Kbps ......7–11...
  • Page 151 CDM-550T Satellite Modem Monitor and Control of the KST-2000A Satellite Terminal Addendum A (For Modem Firmware V1.20 or higher) Part # MN/CDM550T.AA1...
  • Page 152 Disclaimer Comtech EF Data has reviewed this Addendum thoroughly in order that it will be an easy-to-use guide to your equipment. All statements, technical information, and recommendations in this manual and in any guides or related documents are believed reliable, but the accuracy and completeness thereof are not guaranteed or warranted, and they are not intended to be, nor should they be understood to be, representations or warranties concerning the products described.
  • Page 153 Table of Contents ODU Operation via a CDM-550T Modem Front Panel Comprising Firmware ≥ ≥ ≥ ≥ 1.20 ........1 Menu Trees .................................. 3 Select .................................... 3 ODU....................................3 (ODU,ENABLE) Selections............................4 (ODU,ENABLE) CONFIG (Configuration) ......................4 (ODU,ENABLE,CONFIG) TRANSMITTER ......................4 (ODU,ENABLE,CONFIG,TRANSMITTER) FREQUENCY ................
  • Page 154 (ODU,ENABLE,INFO) TRANSMITTER ......................9 (ODU,ENABLE,INFO) RECEIVER........................9 (ODU,ENABLE,INFO) HPA ........................... 9 (ODU,ENABLE,INFO) LNA ........................... 9 (ODU,ENABLE,INFO) EQUIP (Equipment)......................9 (ODU,ENABLE,INFO) ASSEMBLY + SN......................9 (ODU,ENABLE,INFO) FW (Firmware)....................... 10 (ODU,ENABLE) STATUS ............................. 10 CDM-550T Satellite Modem Table of Contents Revision 0...

  • Page 155: Odu Operation Via A Cdm-550T Modem Front Panel Comprising Firmware ≥ ≥ ≥ ≥ 1.20

    KST-2000A Satellite Terminal. The user can fully control and monitor the operation of Comtech EF Data’s KST- 2000A Satellite Terminal from the front panel, using the keypad and display of a CDM-550T modem.
  • Page 156 CDM-550T Satellite Modem Revision 0 KST-2000A FSK Remote Operation MN/CDM550T.AA1 The keypad has six keys, the functions of which are described below: → → → → Moves the cursor to the right, when it is displayed ← ← ← ←...

  • Page 157: Menu Trees

    (Utility) This menu branch permits the user to perform miscellaneous modem functions, such as setting the Real-time clock, adjusting the display brightness, etc. (Outdoor Unit) This permits the user to monitor and control a Comtech EF Data KST- 2000A Transceiver, if connected.

  • Page 158: (Odu,Enable) Selections

    CDM-550T Satellite Modem Revision 0 KST-2000A FSK Remote Operation MN/CDM550T.AA1 1.2.3 (ODU,ENABLE) Selections ODU SELECT: CONFIG INFO STATUS (ENTER) The user is prompted to select 1 of 3 sub-menu branches using the [←] [→] keys, then press <ENTER>. 1.2.4 (ODU,ENABLE)

  • Page 159: (Odu,Enable,Config,Transmitter) Output

    CDM-550T Satellite Modem Revision 0 KST-2000A FSK Remote Operation MN/CDM550T.AA1 1.2.7 (ODU,ENABLE, CONFIG,TRANSMITTER) ATTEN (Attenuation) EDIT ODU TX ATTENUATION: 15.00 dB (PRESS ENTER) The user is prompted to edit the transmit attenuation. This is accomplished by selecting the digit to be edited, using the [←] [→] keys. The value of the digit is then changed using the [↑] [↓] keys.

  • Page 160: (Odu,Enable,Config) Receiver

    CDM-550T Satellite Modem Revision 0 KST-2000A FSK Remote Operation MN/CDM550T.AA1 1.2.12 (ODU,ENABLE, CONFIG) RECEIVER ODU RX: FREQUENCY ATTEN (PRESS ENTER) This menu item is used to select which ODU Receiver parameter is to be modified. Use the [←] [→] keys, then press <ENTER>.

  • Page 161: (Odu,Enable,Config,Receiver) Atten (Attenuation)

    CDM-550T Satellite Modem Revision 0 KST-2000A FSK Remote Operation MN/CDM550T.AA1 1.2.14 (ODU,ENABLE, CONFIG,RECEIVER) ATTEN (Attenuation) EDIT ODU RX ATTENUATION: 15.00 dB (PRESS ENTER) The user is prompted to edit the receive attenuation. This is accomplished by selecting the digit to be edited, using the [←] [→] keys. The value of the digit is then changed using the [↑] [↓] keys.

  • Page 162: (Odu,Enable,Config) Miscellaneous

    CDM-550T Satellite Modem Revision 0 KST-2000A FSK Remote Operation MN/CDM550T.AA1 1.2.19 (ODU,ENABLE, CONFIG) MISCELLANEOUS KST MISC: AGC REF-ADJUST (ENTER) This menu item is used to select miscellaneous ODU parameters for modification. Use the [←] [→] keys, then press <ENTER>. 1.2.20...

  • Page 163: (Odu,Enable,Info) Transmitter

    CDM-550T Satellite Modem Revision 0 KST-2000A FSK Remote Operation MN/CDM550T.AA1 1.2.23 (ODU,ENABLE,INFO) TRANSMITTER TX: ON 14500.0 MHz 19dB AGC: OFF This window provides the KST-2000A Transmitter information including Tx Frequency, and Tx Attenuation, press <ENTER>or <CLEAR>. 1.2.24 (ODU,ENABLE, INFO) RECEIVER 10950.0 MHz...

  • Page 164: (Odu,Enable,Info) Fw (Firmware)

    CDM-550T Satellite Modem Revision 0 KST-2000A FSK Remote Operation MN/CDM550T.AA1 1.2.29 ODU,ENABLE,INFO) FW (Firmware) FIRMWARE INFO: M&C FW: 9364-1- VER: 01.01.01 Note: The blinking cursor is on the M&C. Use the [↑] [↓] keys to view additional firmware information for the Up Converter, Down Converter, and HPA.
  • Page 165 CDM-550T Satellite Modem Monitor and Control of the KST-2000A Satellite Terminal Addendum A (For Modem Firmware V1.20 or higher) Part # MN/CDM550T.AA1...
  • Page 166 Disclaimer Comtech EF Data has reviewed this Addendum thoroughly in order that it will be an easy-to-use guide to your equipment. All statements, technical information, and recommendations in this manual and in any guides or related documents are believed reliable, but the accuracy and completeness thereof are not guaranteed or warranted, and they are not intended to be, nor should they be understood to be, representations or warranties concerning the products described.
  • Page 167 Table of Contents ODU Operation via a CDM-550T Modem Front Panel Comprising Firmware ≥ ≥ ≥ ≥ 1.20 .........1 Menu Trees...................................3 Select .....................................3 ODU ....................................3 (ODU,ENABLE) Selections ............................4 (ODU,ENABLE) CONFIG (Configuration) ......................4 (ODU,ENABLE,CONFIG) TRANSMITTER......................4 (ODU,ENABLE,CONFIG,TRANSMITTER) FREQUENCY................4 (ODU,ENABLE,CONFIG,TRANSMITTER) ATTEN (Attenuation) ..............5 (ODU,ENABLE,CONFIG,TRANSMITTER) OUTPUT ..................5...
  • Page 168 (ODU,ENABLE,CONFIG,MISCELLANEOUS) AGC (AUTO GAIN CONTROL) .........8 (ODU,ENABLE,CONFIG,MISCELLANEOUS) REF-ADJUST................8 (ODU,ENABLE) INFO (Information) ........................8 (ODU,ENABLE,INFO) TRANSMITTER.......................9 (ODU,ENABLE,INFO) RECEIVER ........................9 (ODU,ENABLE,INFO) HPA............................9 (ODU,ENABLE,INFO) LNA............................9 (ODU,ENABLE,INFO) EQUIP (Equipment) ......................9 (ODU,ENABLE,INFO) ASSEMBLY + SN ......................9 (ODU,ENABLE,INFO) FW (Firmware) .......................10 (ODU,ENABLE) STATUS............................10 CDM-550T Satellite Modem Table of Contents Revision 0...

  • Page 169: Odu Operation Via A Cdm-550T Modem Front Panel Comprising Firmware ≥ ≥ ≥ ≥ 1.20

    KST-2000A Satellite Terminal. The user can fully control and monitor the operation of Comtech EF Data’s KST- 2000A Satellite Terminal from the front panel, using the keypad and display of a CDM-550T modem.
  • Page 170 CDM-550T Satellite Modem Revision 0 KST-2000A FSK Remote Operation MN/CDM550T.AA1 The keypad has six keys, the functions of which are described below: → → → → Moves the cursor to the right, when it is displayed ← ← ← ←...

  • Page 171: Menu Trees

    (Utility) This menu branch permits the user to perform miscellaneous modem functions, such as setting the Real-time clock, adjusting the display brightness, etc. (Outdoor Unit) This permits the user to monitor and control a Comtech EF Data KST- 2000A Transceiver, if connected.

  • Page 172: (Odu,Enable) Selections

    CDM-550T Satellite Modem Revision 0 KST-2000A FSK Remote Operation MN/CDM550T.AA1 1.2.3 (ODU,ENABLE) Selections ODU SELECT: CONFIG INFO STATUS (ENTER) The user is prompted to select 1 of 3 sub-menu branches using the [←] [→] keys, then press <ENTER>. 1.2.4 (ODU,ENABLE)

  • Page 173: (Odu,Enable,Config,Transmitter) Output

    CDM-550T Satellite Modem Revision 0 KST-2000A FSK Remote Operation MN/CDM550T.AA1 1.2.7 (ODU,ENABLE, CONFIG,TRANSMITTER) ATTEN (Attenuation) EDIT ODU TX ATTENUATION: 15.00 dB (PRESS ENTER) The user is prompted to edit the transmit attenuation. This is accomplished by selecting the digit to be edited, using the [←] [→] keys. The value of the digit is then changed using the [↑] [↓] keys.

  • Page 174: (Odu,Enable,Config) Receiver

    CDM-550T Satellite Modem Revision 0 KST-2000A FSK Remote Operation MN/CDM550T.AA1 1.2.12 (ODU,ENABLE, CONFIG) RECEIVER ODU RX: FREQUENCY ATTEN (PRESS ENTER) This menu item is used to select which ODU Receiver parameter is to be modified. Use the [←] [→] keys, then press <ENTER>.

  • Page 175: (Odu,Enable,Config,Receiver) Atten (Attenuation)

    CDM-550T Satellite Modem Revision 0 KST-2000A FSK Remote Operation MN/CDM550T.AA1 1.2.14 (ODU,ENABLE, CONFIG,RECEIVER) ATTEN (Attenuation) EDIT ODU RX ATTENUATION: 15.00 dB (PRESS ENTER) The user is prompted to edit the receive attenuation. This is accomplished by selecting the digit to be edited, using the [←] [→] keys. The value of the digit is then changed using the [↑] [↓] keys.

  • Page 176: (Odu,Enable,Config) Miscellaneous

    CDM-550T Satellite Modem Revision 0 KST-2000A FSK Remote Operation MN/CDM550T.AA1 1.2.19 (ODU,ENABLE, CONFIG) MISCELLANEOUS KST MISC: AGC REF-ADJUST (ENTER) This menu item is used to select miscellaneous ODU parameters for modification. Use the [←] [→] keys, then press <ENTER>. 1.2.20...

  • Page 177: (Odu,Enable,Info) Transmitter

    CDM-550T Satellite Modem Revision 0 KST-2000A FSK Remote Operation MN/CDM550T.AA1 1.2.23 (ODU,ENABLE,INFO) TRANSMITTER TX: ON 14500.0 MHz 19dB AGC: OFF This window provides the KST-2000A Transmitter information including Tx Frequency, and Tx Attenuation, press <ENTER>or <CLEAR>. 1.2.24 (ODU,ENABLE, INFO) RECEIVER 10950.0 MHz...

  • Page 178: (Odu,Enable,Info) Equip (Equipment)

    CDM-550T Satellite Modem Revision 0 KST-2000A FSK Remote Operation MN/CDM550T.AA1 1.2.29 ODU,ENABLE,INFO) FW (Firmware) FIRMWARE INFO: M&C FW: 9364-1- VER: 01.01.01 Note: The blinking cursor is on the M&C. Use the [↑] [↓] keys to view additional firmware information for the Up Converter, Down Converter, and HPA.

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