Comtech-ef-data CDM-550T Instrukcja Użytkownika Strona 1

CDM-550T Satellite Modem Installation and Operation Manual (Viterbi/Sequential/RS/Turbo) (For Firmware V1.19 or higher) I

CDM-550T Satellite Modem Revision 3 Table of Contents MN/CDM550T.IOM 11.2 M&C Connection ...

CDM-550T Satellite Modem Revision 3 Clocking Modes MN/CDM550T.IOM 10–6 Notes:

Chapter 11. EDMAC CHANNEL 11.1 Theory of Operation As explained previously, EDMAC is the acronym for Embedded Distant-end Monitor and Control. This

CDM-550T Satellite Modem Revision 3 EDMAC Channel MN/CDM550T.IOM scrambler and descrambler almost exactly compensates for this degradation. The net

CDM-550T Satellite Modem Revision 3 EDMAC Channel MN/CDM550T.IOM between sending a poll request and receiving a response will be around 5 seconds.

CDM-550T Satellite Modem Revision 3 EDMAC Channel MN/CDM550T.IOM 11–4 This page is intentionally blank.

Chapter 12. AUTOMATIC UPLINK POWER CONTROL 12.1 Introduction Automatic Uplink Power Control (AUPC) is a feature whereby a local modem is permitted

CDM-550T Satellite Modem Revision 3 Automatic Uplink Power Control (AUPC) MN/CDM500T.IOM 4) The user will then select AUPC as the operating mode.

CDM-550T Satellite Modem Revision 3 Automatic Uplink Power Control (AUPC) MN/CDM500T.IOM 12–3 12.2.4 Demod Unlock This defines the action the

CDM-550T Satellite Modem Revision 3 Automatic Uplink Power Control (AUPC) MN/CDM500T.IOM 12–4 Notes:

Chapter 13. FLASH UPGRADING The CDM-550T eliminates the need for updating firmware by physically replacing Electrically-Erasable Programmable Read-On

CDM-550T Satellite Modem Revision 3 Table of Contents MN/CDM550T.IOM 15.5.1 Start Of Packet ...

CDM-550T Satellite Modem Revision 3 Flash Upgrading MN/CDM550T.IOM 13–2 modem will automatically restart, running the new version of firmware. Duri

Chapter 14. SUMMARY OF SPECIFICATIONS 14.1 MODULATOR Modulation BPSK, QPSK, and Offset QPSK Data rate range • Overall, 2.4 - 2048 kbps • 4.8 kbps

CDM-550T Satellite Modem Revision 3 Summary Of Specifications MN/CDM550T.IOM FEC • None: Uncoded BPSK/QPSK/OQPSK • Viterbi: k=7, per IESS 308/30

CDM-550T Satellite Modem Revision 3 Summary Of Specifications MN/CDM550T.IOM 14.2 Demodulator Data rate range, operating modes, de-scrambling, in

CDM-550T Satellite Modem Revision 3 Summary Of Specifications MN/CDM550T.IOM TURBO PRODUCT CODEC BER (With two adjacent carriers, each 7 dB highe

CDM-550T Satellite Modem Revision 3 Summary Of Specifications MN/CDM550T.IOM 14.5 Miscellaneous Front panel • Tactile keypad, 6 keys ( ↑, ↓, ←,

CDM-550T Satellite Modem Revision 3 Summary Of Specifications MN/CDM550T.IOM 14–6 Typical Coarse AGC voltage CharacteristicCoarse AGC Voltage - P

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

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM• Controller-to-target pair has one line driver (controller), and all targets hav

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM Target-to-Controller: Start of Packet Target Address Address De-limiter Instruc

CDM-550T Satellite Modem Revision 3 Table of Contents MN/CDM550T.IOM (ODU:) ENABLE Æ CONFIG Æ TRANSMITTER ÆFREQUENCY ...

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM15.5.4 Instruction Code Qualifier This is a single character which further qualif

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15.5.6 End Of Packet Controller to Target: This is the 'Carriage Return&a

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM15–6 Index Notes: Where Indicator Code (Column ‘CODE’), Command (Column ‘C’), or

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15.6.1 Transmit (Tx) Commands and Queries Parameter Type Command (Instruction

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15–8 Parameter Type Command (Instruction Code and qualifier) Arguments for Co

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15–9 Parameter Type Command (Instruction Code and qualifier) Arguments for Comm

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15.6.2 Receive (Rx) Commands and Queries Parameter Type Command (Instruction

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15–11 Parameter Type Command (Instruction Code and qualifier) Arguments for Com

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15–12 Parameter Type Command (Instruction Code and qualifier) Arguments for C

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15.6.3 Unit Remote Commands and Queries Parameter Type Command (Instruction Co

CDM-550T Satellite Modem Revision 3 Table of Contents MN/CDM550T.IOM Figures Figure 1-1. CDM-550T ...

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15–14 Parameter Type Command (Instruction Code and qualifier) Arguments for C

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15–15 Parameter Type Command (Instruction Code and qualifier) Arguments for Com

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15–16 Parameter Type Command (Instruction Code and qualifier) Arguments for C

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15–17 Parameter Type Command (Instruction Code and qualifier) Arguments for Com

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15–18 Parameter Type Command (Instruction Code and qualifier) Arguments for C

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15–19 Parameter Type Command (Instruction Code and qualifier) Arguments for Com

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15.6.4 Remote Queries Parameter Type Command (Instruction Code and qualifier

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15–21 Parameter Type Command (Instruction Code and qualifier) Arguments for Com

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15–22 Parameter Type Command (Instruction Code and qualifier) Arguments for C

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15.6.5 Bulk Commands Parameter Type Command (Instruction Code and qualifier) A

CDM-550T Satellite Modem Revision 3 Table of Contents MN/CDM550T.IOM xii This page is intentionally blank.

CDM-550T Satellite Modem Revision 3 Remote Control MN/CDM550T.IOM 15–24 Notes:

Appendix A. CABLE DRAWINGS A.1 Overview The RS-530 standard pinout, provided on the CDM-550T, is becoming more popular in many applications. Howev

CDM-550T Satellite Modem Revision 3 Cable Drawings MN/CDM550T.IOM A.1.1 RS-530 to RS-422/449 Data Cable Figure A-1 depicts the cable drawing for a

CDM-550T Satellite Modem Revision 3 Cable Drawings MN/CDM550T.IOM A.1.2 RS-530 to V.35 Data Cable Figure A-2 depicts the cable drawing for a RS-530

CDM-550Cable Drawings T Satellite Modem Revision 3 MN/CDM550T.IOM A-4 A.1.3 RS-232 Remote Control Cable Figure A-3 depicts the cable required for a

Appendix B. Eb/No MEASUREMENT Although the CDM-550T calculates and displays the value of receive Eb/N0 on the front panel of the unit, it is sometime

CDM-550T Satellite Modem Revision 3 Eb/No Measurement MN/CDM550T.IOM To make this measurement: • Use a vertical scale of 1 or 2 dB/division. • Se

CDM-550T Satellite Modem Revision 3 Eb/No Measurement MN/CDM550T.IOM (C+N)/NEb/No - Uncoded BPSK Eb/No - Rate 1/2 BPSKEb/No - Uncoded QPSK Eb/No -

CDM-550T Satellite Modem Revision 3 Eb/No Measurement MN/CDM550T.IOM B–4 Notes:

Appendix C. ASYNC OVERHEAD OPTION C.1 Introduction For many applications the EDMAC channel provides an excellent solution to the problem of communic

Preface Customer Support Contact the Comtech EF Data Customer Support Department for: • Product support or training • Reporting comments or suggest

CDM-550T Satellite Modem Revision 3 Async Overhead Option MN/CDM550T.IOM C.2 Electrical Interface The electrical interface is 3-wire RS-232 (Rx Dat

CDM-550T Satellite Modem Revision 3 Async Overhead Option MN/CDM550T.IOM a customer wishes to select this mode, Customer Service should be contacted

CDM-550T Satellite Modem Revision 3 Async Overhead Option MN/CDM550T.IOM C–4 Notes:

Appendix D. KST-2000A FSK (ODU) REMOTE OPERATION D.1 ODU Operation via a CDM-550T Modem Front Panel Comprising Firmware ≥ 1.20 This appendix incorp

CDM-550T Satellite Modem Revision 3 KST-2000A FSK Remote Operation MN/CDM550T.IOM The display has two lines each of 24 characters. On most menu scre

CDM-550T Satellite Modem Revision 3 KST-2000A FSK Remote Operation MN/CDM550T.IOM D.2.2 SELECT: ODU TRANSCEIVER CONTROL: DISABLE ENABLE

CDM-550T Satellite Modem Revision 3 KST-2000A FSK Remote Operation MN/CDM550T.IOM (ODU:) ENABLE Æ CONFIG Æ TRANSMITTER ÆFREQUENCY EDIT ODU TX FREQ

CDM-550T Satellite Modem Revision 3 KST-2000A FSK Remote Operation MN/CDM550T.IOM (ODU:) ENABLE Æ CONFIG Æ TRANSMITTER Æ HPA Æ STATE SELECT KST

CDM-550T Satellite Modem Revision 3 KST-2000A FSK Remote Operation MN/CDM550T.IOM (ODU:) ENABLE ÆCONFIG Æ RECEIVER Æ ATTEN (Attenuation) EDIT OD

CDM-550T Satellite Modem Revision 3 KST-2000A FSK Remote Operation MN/CDM550T.IOM (ODU:) ENABLE ÆCONFIG Æ RECEIVER Æ LNA Æ FAULT- LOGIC SELECT

CDM-550T Satellite Modem Revision 3 Preface MN/CDM550T.IOM xiv About this Manual This manual provides installation and operation information for th

CDM-550T Satellite Modem Revision 3 KST-2000A FSK Remote Operation MN/CDM550T.IOM D.2.2.1.2 (ODU: ) ENABLE Æ INFO (Information) INFO: TX RX HPA

CDM-550T Satellite Modem Revision 3 KST-2000A FSK Remote Operation MN/CDM550T.IOM (ODU: ) ENABLE Æ INFO Æ EQUIP (Equipment) EQUIP-TYPE: KST

CDM-550T Satellite Modem Revision 3 KST-2000A FSK Remote Operation MN/CDM550T.IOM D–10 D.2.2.1.3 (ODU: ) ENABLE Æ STATUS STATUS: PS:OK RF:OK UC:

METRIC CONVERSIONS Units of Length Unit Centimeter Inch Foot Yard Mile Meter Kilometer Millimeter 1 centimeter — 0.3937 0.03281 0.010

2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 • 333 • 2200 PHONE 480 • 333 • 2161 FAX

CDM-550T Satellite Modem Revision 3 Preface MN/CDM550T.IOM xv Electrical Safety The CDM-550T has been shown to comply with the EN 60950 Safety of I

CDM-550T Satellite Modem Revision 3 Preface MN/CDM550T.IOM xvi Examples of acceptable ratings for the cable include HAR, BASEC and HOXXX-X. Example

CDM-550T Satellite Modem Revision 3 Preface MN/CDM550T.IOM Warranty Policy Comtech EF Data products are warranted against defects in material and w

CDM-550T Satellite Modem Revision 3 Preface MN/CDM550T.IOM xviii A fixed charge established for each product will be imposed for all equipment retu

Chapter 1. INTRODUCTION 1.1 Overview The CDM-550T Satellite Modem, shown here in Figure 1-1, is a very low-cost Closed Network Satellite Modem, inten

CDM-550T Satellite Modem Revision 3 Introduction MN/CDM550T.IOM 1.2.1 AUPC An important innovation in the CDM-550T is the addition of Automatic Upl

CDM-550T Satellite Modem Revision 3 Introduction MN/CDM550T.IOM 1.3 Options As an external option, a G.703 interface (Comtech EF Data Model Number

CDM-550T Satellite Modem Revision 3 Introduction MN/CDM550T.IOM 1–4 Firmware update notes: • Version 1.33 has added a new timed Diversity Switch o

Chapter 2. INSTALLATION 2.1 Unpacking and Inspection Inspect shipping containers for damage. If shipping containers are damaged, keep them until the

CDM-550T Satellite Modem Revision 3 Installation MN/CDM550T.IOM 2–2 2.3 Configuration There are no internal jumpers to configure, no interface c

Chapter 3. FUNCTIONAL DESCRIPTION The CDM-550T has two fundamentally different types of interface – Data and Intermediate Frequency (IF): • The data

CDM-550T Satellite Modem Revision 3 Functional Description MN/CDM550T.IOM 3–2 Receive Data 1. Rx IF signal is first translated to a fixed IF freq

4–1 Chapter 4. PHYSICAL DESCRIPTION 4.1 Overview The CDM-550T is constructed as a 1RU high rack-mounting chassis, which can be free-standing, if des

CDM-550T Satellite Modem Installation and Operation Manual (Viterbi/Sequential/RS/Turbo) (For Firmware V1.19 or higher) Part Numb

CDM-550T Satellite Modem Revision 3 Physical Description MN/CDM550T.IOM 4.2 Front Panel On the front panel of the unit is the Vacuum Fluorescent D

CDM-550T Satellite Modem Revision 3 Physical Description MN/CDM550T.IOM 4.3 Rear Panel External cables are attached to connectors on the rear p

CDM-550T Satellite Modem Revision 3 Physical Description MN/CDM550T.IOM 4–4 The pinout details for this connector are provided in the next chapter

Chapter 5. REAR PANEL CONNECTOR PINOUTS 5.1 Connector Overview The rear panel connectors, shown in Figure 5-1, provide all necessary external connec

CDM-550T Satellite Modem Revision 3 Rear Panel Connector Pinouts MN/CDM550T.IOM 5.2 Data Interface Connector, DB-25F Table 5-1. Data Connect

CDM-550T Satellite Modem Revision 3 Rear Panel Connector Pinouts MN/CDM550T.IOM 5.3 Alarms Connector, DB-15M Table 5-2. Alarms Connector,

CDM-550T Satellite Modem Revision 3 Rear Panel Connector Pinouts MN/CDM550T.IOM 5–4 5.5 Auxiliary Serial Connector, HE1402 3-Pin Header Table

6–1 Chapter 6. FRONT PANEL OPERATION 6.1 Introduction Figure 6-1. CDM-550T Front Panel The user can fully control and monitor the operation of the

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.1.1 Front Panel Keypad The keypad has six keys, the functions of which

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2 Menu Trees Figure 6-3 shows the menu structure of the CDM-550T. The ‘

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CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.1 Opening Screen This screen is displayed whenever power is first ap

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.3 SELECT: CONFIG The sub-branches available are: CONFIG: ALL TX R

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.3.1 (CONFIG:) TX (Transmit) The sub-branches available are: TX: MOD

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.3.1.3 (CONFIG: TX) DATA (Data Rate) Edit the Tx data rate. This is a

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM If the Turbo Codec option is installed, the following menu will be display

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.3.1.5 (CONFIG: TX) ON/OFF Select either ON, OFF, or RTI, using the [

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM (CONFIG: TX Æ PWR Æ MODE) MANUAL EDIT OUTPUT POWER LEVEL: -03.9 dBm

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6–11 (CONFIG: TX Æ PWR Æ MODE Æ AUPC) TARGET EbNo d upper (CONFIG: TX Æ

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.3.1.6 (CONFIG: TX) SCRAM (Scrambling) Select either ON or OFF, using

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.3.2 (CONFIG:) RX (Receive) The sub-branches available are: RX: M

CDM-550T Satellite Modem Revision 3 Table of Contents MN/CDM550T.IOM Table of Contents TABLE OF CONTENTS ...

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM NOTE: The minimum and maximum data rates are dependent on modulation type

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM (CONFIG: RX Æ FEC Æ RATE) FEC RATE Select Rate 1/2, Rate 3/4 or Rate 7/8

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM The value entered here determines the amount of frequency uncertainty the

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM (CONFIG: RX) BUF (Buffer size) Edit the size, in bits of the Plesiochrono

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.3.2.9 (CONFIG:) FRAME (Framing Mode) The sub-branches available are:

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.3.2.12 (CONFIG: FRAME Æ FRAMED) EDMAC-ON Select either MASTER or SLAV

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM Remember that this is a unit which is intended to be located at the distan

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.3.4.3 (CONFIG: REMOTE Æ BAUD) If BAUD RATE is selected: Edit the ba

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM (CONFIG: REM Æ INTFC Æ ADDR) RS485 BUS ADDRESS: Edit the RS-485 bus addre

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.3.5.2 (CONFIG:MASK) Eb/No Select either ACTIVE or MASKED, using the

CDM-550T Satellite Modem Revision 3 Table of Contents MN/CDM550T.IOM 1.4 Compatibility ...

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.3.5.5 (CONFIG, MASK) TX-AIS Select either ACTIVE or MASKED, using t

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.4 SELECT: TEST Select NORM, TX-CW, TX-1,0, IF LOOP, DIG LOOP, I/O L

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM Figure 6-4. Loopback Modes 6–26

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.5 SELECT: INFO (Information) Select ID, TX, RX, BUFF, EDMAC, REMCONT

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.5.3 (INFO) RX (Receive information) The information displayed here i

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.5.6 (INFO) REMCONT (Remote Control information) This screen shows if

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.6 SELECT: MONIT (Monitor) Select ALARMS, RX-PARAMS, STORED EVENTS, S

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.6.1.3 (MONIT: ALARMS) TRANSMIT (Transmit alarms) The screen will ind

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM If the user selects STORED EVENTS, the following sub-menu is displayed: 6.

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.6.3.2 (MONIT:) STATS (Link Statisics) Select VIEW, CLEAR, or CONFIGU

CDM-550T Satellite Modem Revision 3 Table of Contents MN/CDM550T.IOM 6.2.2 SELECT: (Top level) Menu ...

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM interval, the average Eb/No will also show ‘LOSS’. (The display will show

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6.2.6.4 (MONITOR) AUPC If AUPC is selected, and the modem is in Framed m

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM If the selected location does not contain a previously stored configurati

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM If, however, the selected location does not contain valid data, the follow

CDM-550T Satellite Modem Revision 3 Front Panel Operation MN/CDM550T.IOM 6–38 6.2.8.3 (UTIL:) MAN-1:1 (Manual 1:1 switchover) If the unit is p

Chapter 7. FORWARD ERROR CORRECTION OPTIONS 7.1 Introduction As standard, the CDM-550T Modem is equipped with two Forward Error Correction (FEC) D

CDM-550T Satellite Modem Revision 3 Forward Error Correction Options MN/CDM550T.IOM Note: In BPSK mode, the CDM-550T only permits a coding rate of 1

CDM-550T Satellite Modem Revision 3 Forward Error Correction Options MN/CDM550T.IOM 7.4 Reed-Solomon Outer Codec (Option) IMPORTANT It cannot be

CDM-550T Satellite Modem Revision 3 Forward Error Correction Options MN/CDM550T.IOM Table 7-3 Concatenated RS Coding Summary FOR AGAINST Exceptiona

CDM-550T Satellite Modem Revision 3 Forward Error Correction Options MN/CDM550T.IOM Union) place strict limits on the power spectral density (also

CDM-550T Satellite Modem Revision 3 Table of Contents MN/CDM550T.IOM 6.2.3.4.3 (CONFIG: REMOTE Æ BAUD) ...

CDM-550T Satellite Modem Revision 3 Forward Error Correction Options MN/CDM550T.IOM It can be clearly seen that the concatenated Reed-Solomon cases

CDM-550T Satellite Modem Revision 3 Forward Error Correction Options MN/CDM550T.IOM NOTE: Whenever uncoded operation is selected, the modem automa

CDM-550T Satellite Modem Revision 3 Forward Error Correction Options MN/CDM550T.IOM 1E-91E-81E-71E-61E-51E-41E-31E-21E-11 2 3

CDM-550T Satellite Modem Revision 3 Forward Error Correction Options MN/CDM550T.IOM Figure 7-2 Sequential Decoding 64 kbps 1E-91E-81E-71E-61E

CDM-550T Satellite Modem Revision 3 Forward Error Correction Options MN/CDM550T.IOM Figure 7-3 Sequential Decoding 1024 kbps 1E-91E-81E-71E-61E-

CDM-550T Satellite Modem Revision 3 Forward Error Correction Options MN/CDM550T.IOM 1E-91E-81E-71E-61E-51E-41E-31E-21E-11 2 3

CDM-550T Satellite Modem Revision 3 Forward Error Correction Options MN/CDM550T.IOM 1E-91E-81E-71E-61E-51E-41E-31E-21E-11 2 3

CDM-550T Satellite Modem Revision 3 Forward Error Correction Options MN/CDM550T.IOM 1E-91E-81E-71E-61E-51E-41E-31E-21E-11 2 3

CDM-550T Satellite Modem Revision 3 Forward Error Correction Options MN/CDM550T.IOM Figure 7-7 Comtech EF Data Turbo Product Codec Rate 3/4 {

CDM-550T Satellite Modem Revision 3 Forward Error Correction Options MN/CDM550T.IOM 7–15 Figure 7-8 Differential Encoding - No FEC 1E-91E-81E-

CDM-550T Satellite Modem Revision 3 Table of Contents MN/CDM550T.IOM 7.2 Viterbi ...

CDM-550T Satellite Modem Revision 3 Forward Error Correction Options MN/CDM550T.IOM 7–16 Notes:

Chapter 8. OFFSET QPSK OPERATION Offset QPSK modulation is a variation of normal QPSK, which is offered in the CDM-550T. Normal, bandlimited QPSK prod

CDM-550T Satellite Modem Revision 3 Offset QPSK Operation MN/CDM550T.IOM 8–2 Notes:

Chapter 9. RS-232 DATA INTERFACE - ASYNCHRONOUS OPERATION 9.1 Introduction The CDM-550T supports asynchronous RS-232 in addition to synchronous RS-2

CDM-550T Satellite Modem Revision 3 RS-232 Data Interface - Asynchronous Operation MN/CDM550T.IOM 9–2 irrelevant - the selected clocking options ar

Chapter 10. CLOCKING MODES 10.1 Overview When dealing with satellite modems, the subject of clocking can be a complex issue. This section describes

CDM-550T Satellite Modem Revision 3 Clocking Modes MN/CDM550T.IOM substituted, so an accurate and stable clock is present on ST, rather than a clock

CDM-550T Satellite Modem Revision 3 Clocking Modes MN/CDM550T.IOM essential to provide an external loop between the ST and TX clock pins. If this is

CDM-550T Satellite Modem Revision 3 Clocking Modes MN/CDM550T.IOM Figure 10-1. Tx Clock Modes 10–4

CDM-550T Satellite Modem Revision 3 Clocking Modes MN/CDM550T.IOM Figure 10-2 . RX Clock Modes 10–5