Premier Mounts CDM-600 7.7.3 End-to-End Processing Delay

CDM-600 Satellite Modem Revision 7

Forward Error Correction Options MN/CDM600.IOM

7–9

This new LDPC/TPC codec module may be installed in any existing CDM-600, as a simple field

upgrade, or already installed in new modems ordered from the factory. It requires Firmware

Version 1.6.0 (or higher) to be installed.

Please contact the Sales Department at Comtech EF Data for pricing and delivery information.

The table that follows compares all TPC and LDPC modes available in Comtech EF Data’s

CDM-600, and shows Eb/No performance and spectral efficiency (occupied bandwidth) for each

case. This information will be of particular interest to satellite operators wishing to

simultaneously balance transponder power and bandwidth. The large number of modes offered

will permit, in the majority of cases, significant power and/or bandwidth savings when compared

with existing schemes such as concatenated Viterbi/Reed-Solomon, or the popular 8-

PSK/Trellis/Reed-Solomon (Intelsat IESS-310)

7.7.3 End-to-End Processing Delay

In many cases, FEC methods that provide increased coding gain do so at the expense of

increased processing delay. However, with TPC, this increase in delay is very modest. Table 7-6

shows, for the CDM-600, the processing delays for the major FEC types, including the three

TPC modes:

Table 7-6. Turbo Product Coding Processing Delay Comparison

FEC Mode (64 kbps data rate) End-to-end delay, ms

Viterbi, Rate 1/2 12

Sequential, Rate 1/2 74

Viterbi Rate 1/2 + Reed Solomon 266

Sequential Rate 1/2 + Reed Solomon 522

Turbo Product Coding, Rate 3/4, O/QPSK 47

Turbo Product Coding, Rate 21/44, BPSK 64

Turbo Product Coding, Rate 5/16, BPSK 48

Turbo Product Coding, Rate 7/8, O/QPSK 245 *

Turbo Product Coding, Rate 0.95, O/QPSK 69

LDPC Coding, Rate 1/2 248

LDPC Coding, Rate 2/3, O/QPSK 296

LDPC Coding, Rate 2/3, 8-PSK, 8-QAM 350

LDPC Coding, Rate 3/4, O/QPSK 321

LDPC Coding, Rate 3/4, 8-PSK, 8-QAM, 16-QAM 395

Note that in all cases, the delay is inversely proportional to data rate, so for 128 kbps, the

delay values would be half of those shown above. It can be seen that the concatenated

Reed-Solomon cases increase the delay significantly (due mainly to interleaving/de-

interleaving), while the TPC cases yield delays which are less than or equal to Sequential

decoding.

*A larger block is used for the Rate 7/8 code, which increases decoding delay.

Contents

Main CD M - 600 Page Errata A Comtech EF Data Documentation Update Change to AUPC Target Eb/No Parameter Page Errata B Subject: Revised Miscellaneous Table Comments: The following changes affects the values shown on page 15-9. Change Specifics: Errata C Errata D Comments: Change Specifics: 12.2 Demodulator Page Errata E Subject: Changed Figure 7-5, TPC Curve for Rate 7/8 Comtech Turbo Product Codec Rate 7/8 QPSK/OQPSK, 8-PSK and 16-QAM Figure 7-5. Comtech EF Data Turbo Product Codec Rate 7/8 QPSK/OQPSK, 8-PSK AND 16-QAM Errata F CDM-600 AGC Voltage Page Errata G Page Page Page CDM-600 Part Number MN/CDM600.IOM Revision 7 February 9, 2005 Page Table of Contents Page Page Page Page Page Tables Figures Preface Customer Service About this Manual Conventions and References Metric Conversion Cautions and Warnings Recommended Standard Designations Reporting Comments or Suggestions Concerning this Manual Electrical Safety Fuses Environmental Installation ~ Telecommunications Terminal Equipment Directive EMC (Electromagnetic Compatibility) Warranty Policy Limitations of Warranty Exclusive Remedies Disclaimer Chapter 1. INTRODUCTION 1.1 Standard Features 1.1.1 AUPC 1.1.2 Software Flash Upgrading 1.1.3 Verification 1.1.4 Data Interfaces 1.2 Major Assemblies 1.3 FAST Options and Hardware Options Page 1.3.1 FAST Accessible Options 1.3.2 FAST System Theory 1.3.3 Implementation 1.3.4 Hardware Options 1.3.5 Supporting Hardware and Software 1.4 Compatibility 1.5 New in this Release Page Chapter 2. INSTALLATION 2.1 Unpacking 2.2 Mounting Page 2.3 Configuration 2.4 Select Internal IF Loop 2.5 Connect External Cables Chapter 3. FUNCTIONAL DESCRIPTION CDM-600 Satellite Modem Revision 7 Functional Description MN/CDM600.IOM 32 Figure 3-1. CDM-600 Modem Block Diagram AS/0423 BASEBAND FRAMING CARD AS/0424 MODEM CARD TX IF RX IF MICROPROCESSOR (U44) & PROCESSOR FPGA (U49) Chapter 4. PHYSICAL DESCRIPTION 4.1 Introduction 4.2 Front Panel 4.3 Rear Panel 4.3.1 IEC Line Input Connector 4.3.2 Rx and Tx IF Connectors (J1 and J2) 4.3.3 Overhead Data Connector (P3A) 4.3.4 Data Interface Connector (P3B) 4.3.5 External Reference Connector (J9) 4.3.6 Audio Connector (P4A) 4.3.7 Remote Control connector (P4B) 4.3.8 IDR Alarm connector (P5A) 4.3.9 Form C Traffic Alarm Connector (P5B) 4.3.10 Auxiliary Serial Connector (P6) 4.3.11 Balanced G.703 Interface Connector (P7) Page 4.4 Dimensional Envelope Chapter 5. CONNECTOR PINOUTS 5.1 Connector Overview 5.2 BNC Connectors 5.3 Overhead Interface Connector (P3A) 5.4 Data Interface Connector (P3B) 5.5 Audio Interface Connector (P4A) 5.6 Remote Control Interface Connector (P4B) 5.7 IDR Backward Alarms Connector (P5A) 5.8 Unit Alarms (P5B) 5.9 Auxiliary Serial Connector (P6) 5.10 Balanced G.703 Interface Connector (P7) 5.11 AC Power Connector 5.12 Ground Connector Page Chapter 6. FRONT PANEL OPERATION 6.1 Description Page Page CDM-600 Satellite Modem Revision 7 Front Panel Operation MN/CDM600.IOM 64 Figure 6-3. Menu Trees 6.2 Opening Screen 6.3 Main Menu COMTECH CDM-600 OPEN NETWORK MODEM TURBO: TPC/LDPC S/W VER 2.0.1 SELECT: CONFIGURATION TEST INFORMATIO MONITOR STORE/LOAD UTILITY ODU FAST 6.3.1 CONFIG CONFIG: ALL MODE TX RX CLOCKS D&I EDMAC MISC REMOTE MASK IMPED STATS 6.3.1.1 CONFIG: ALL 6.3.1.2 CONFIG: MODE ALL = START (STOP, START) MODE: TX=RS422:NONE RX=RS422:NONE (NONE,IBS,IDR,INSERT,EDMAC,D&I++,ESC++) 6.3.1.3 CONFIG: TX CONFIG: TX: TX-IF TX-IF: CARRIER = ON (ON,OFF,RTI) TX FREQ=176.0000MHz SPECTRUM TX-IF: POWER ENCODER MOD DATA SCRAMBLER DATA=20000.000kbps SYMBOL=10000.000ksym CONFIG: TX: POWER OUTPUT POWER: MODE = MANUAL (MANUAL,AUPC) OUTPUT POWER LEVEL = 20.0 dBm OUTPUT POWER: MODE = AUPC (MANUAL,AUPC) TARGET-EbNo/RANGE ALARM/ACTIO MINIMUM EbNo OF REMOTE MODEM = 5.0dB MAXIMUM PERMITTED POWER INCREASE = 9dB CONFIG: TX: ENCODER ENCODER = TPC (NONE,VIT,SEQ,TCM,TPC,LDPC) REED-SOLOMON= OFF (ON,OFF) MAX TX PWR ACTION = NONE (NONE, TX-ALM) REM DEMOD UNLOCK ACT = NOM-PWR(NOM, MAX) ENCODER = NONE (NONE,VIT,SEQ,TCM,TPC,LDPC) DIFF-ENCODER= OFF (ON, OFF) CONFIG: TX: ENCODER: REED-SOLOMON ON REED-SOLOMON ENCODING = ON(200/180) CONFIG: TX: MODULATION MODULATION= QPSK (B,Q,OQ-PSK) FEC RATE = 1/2 (1/2,3/4,7/8) MODULATION= QPSK (B,Q OQ,8PSK,16Q,8QAM) FEC RATE = 1/2 (1/2,3/4,7/8) CONFIG: TX: DATA CONFIG: TX: SCRAMBLER TX DATA RATE = 01544.000 kbps DATA INVERT = OFF (ON,OFF) TX SCRAMBLER = ON (ON,OFF) FRAME SCRAMBLER TX SCRAMBLER = IESS (NORMAL,IESS,OFF) IESS-315 V.35 SCRAMBLER 6.3.1.4 CONFIG: RX CONFIG: RX: RX-IF RX-IF DECODER DEMOD DATA DESCRAM EbNo DATA=00064.000kbps SYMBOL=00037.333ksym ACQUISITION SWEEP RANGE = +/- 32 kHz RX FREQ=070.0000 MHz SPECTRUM INVERT=OFF CONFIG: RX: DECODER DECODER = VIT NONE,VIT,SEQ,TCM,TPC,LDPC) REED-SOLOMON = OFF (ON,OFF) DECODER = NONE (NONE,VIT,SEQ,TCM,TPC,LDPC) DIFF-DECODER= OFF (ON,OFF) CONFIG: RX: DECODER: REED-SOLOMON ON REED-SOLOMON DECODING = ON(200/180) CONFIG: RX: DEMODULATION CONFIG: RX: DATA DEMODULATION = QPSK(B,Q,OQ,8PSK,16QAM) FEC RATE = 1/2 (1/2,3/4,7/8) RECEIVE DATA RATE = 00064.000 kbps DATA INVERT = OFF (ON,OFF) DEMODULATION= QPSK (B,Q OQ,8PSK,16Q,8QAM) CONFIG: RX: DESCRAMBLER RX DESCRAMBLER = ON (ON,OFF) RX DESCRAMBLER = IESS (NORMAL,IESS,OFF) IESS-315 V.35 DESCRAMBLER CONFIG: RX: EbNo 6.3.1.5 CONFIG: CLOCKS CONFIG: CLOCKS: TX CLOCK RECEIVE EbNo ALARM POINT = 02.0 dB TRANSMIT CLOCK = INTERNAL(SCT) (INT(SCT),TX-TERR(TT),RX-LOOP,EXT-CLK) CONFIG:CLOCKS: RX BUFFER/CLOCK CLK= RX-SAT (RX-SAT,TX-TERR,EXT-CLK,INS) BUFFER-SIZE = 00016bytes(00002ms) CENTER CONFIG: CLOCKS: RX BUFFER/CLOCK: CENTER CONFIG: CLOCKS: EXT-BASEBAND-CLOCK CONFIG: CLOCKS: EXT-FREQ-REF CONFIG: CLOCKS: INTERNAL REFERENCE INTERNAL HI-STABILITY 10 MHz REFERENCE FINE ADJUST: +048 (+/-999) 6.3.1.6 CONFIG: DROP & INSERT CONFIG: DROP & INSERT: DROP CHANNEL TIMESLOTS DRP-TYPE= T1-D4 CHAN/TS LOOP=Y (Y/N) INS-TYPE= T1-D4 CHAN/TS DRP-CH: 1 2 3 4 TS: 01 02 03 04 CONFIG: DROP & INSERT: INSERT CHANNEL TIMESLOTS 6.3.1.7 CONFIG: EDMAC 6.3.1.8 CONFIG: MISC INS-CH: 1 2 3 4 TS: 01 02 03 04 CONFIG: MISC: G.703 CODE CONFIG: MISC: IDR-ESC-TYPE CONFIG: MISC: ADPCM AUDIO VOLUME TX-1 VOLUME= +0 dB TX-2 VOLUME= -2 dB RX-1 VOLUME= +2 dB RX-2 VOLUME= -4 dB TXIDR-TYPE: 64k DATA (64k DATA,AUDIO) RX-IDR-TYPE: 64k DATA (64k DATA,AUDIO) CONFIG: MISC: HIGH-RATE-ESC CONFIG: MISC: WARM-UP HIGH-RATE-ESC = OFF (ON,OFF) BAUDRATE = 9600 PARITY:DATA:STOP = N81 HIGH-STAB REFERENCE POWER-UP WARM-UP: NO DELAY(INSTANT-ON) (INSTANT-ON,DELAY) 6.3.1.9 CONFIG: REMOTE CONTROL ONFIG: REMOTE CONTROL: INTERFACE REMOTE CONTROL = LOCAL (LOCAL,REMOTE) INTERFACE= RS-485-4W (232,485-2,485-4) ADDRESS= 0001 BAUDRATE= 9600 COMTECH CDM-600 OPEN NETWORK MODEM HIGH-STABILITY REF WARMING UP: 045 SEC CONFIG: REMOTE CONTROL: CHAR FORMAT 6.3.1.10 CONFIG: MASK CONFIG: MASK: AIS PARITY:DATA-BITS:STOP-BITS = N81 (N81,E72,O72) CONFIG: MASK: BUFFER SLIP CONFIG: MASK: RX-IF CONFIG: MASK: SATELLITE ALARMS CONFIG: MASK: SATELLITE ALARMS: TX BUFFER SLIP= ACTIVE (ACTIVE,MASK) CONFIG: MASK: SATELLITE ALARMS: RX CONFIG: MASK: TERR-ALM 00 minutes (00 TO 90) 6.3.1.11 CONFIG: IMPEDANCE 6.3.1.12 CONFIG: STATISTICS 6.3.2 TEST MODEM TEST MODE = NORMAL (NORM,TX-CW,TX-1/0,IF,RF,DIG,I/O) Page 6.3.3 INFORMATION INFO:ALL (STOP, START) INFO: ID INFO: MODE INFO: TX A sample display of TX Info is shown. The information displayed here is as follows: IT+RS:126/112 00604.000 QPSK 1/2 SCRM V INFO: RX INFO: CLOCKS INFO: EDMAC INFO: DROP TYPE INFO: INSERT TYPE INFO: REMOTE INFO: ALARMS MASK INFO: MISC REMOTE-CONTROL= LOCAL ADDRESS= 0000 INTERFACE = RS-232 9600 BAUD N81 ALARMS MASKED: TX-AIS RX-AIS BUF-SLIP AGC EBNO SAT 6.3.4 MONITOR Select the parameter to Monitor using the [][] arrow keys, then press ENTER. MONITOR: LIVE-ALARMS MONITOR: LIVE-ALARMS STORED-EVENTS STATISTICS RX-PARAMS AUPC-PARAMS 6.3.4.1 MONITOR: STORED EVENTS STORED EVENTS: CLEAR ALL: NO (NO,YES) #199 FT-FRAME SYNC 23/07/01 16:25:24 6.3.4.2 MONITOR: STATISTICS STATISTICS: STA114: 16.0,16.0,9.0,9.0 09/12/99 14:48:06 CLEAR ALL: NO (N/Y) 6.3.4.3 MONITOR: RX PARAMETERS 6.3.4.4 MONITOR: AUPC-PARAMS 6.3.5 STORE/LOAD RX=PARAMETERS: EbNo=11.4dB F=+11.7kHz BER=0.0E-9 BUFFER=51% RX-LEVEL=-43dBm AUPC-PARAMS: REMOTE EbNo=6.8dB TRANSMIT POWER INCREASE=1.2dB 6.3.5.1 STORE/LOAD: OVERRIDE CONFIGURATION 6.3.6 UTILITIES EDIT DISPLAY BRIGHTNESS: 100% 6.3.6.1 UTILITIES: SET-RTC 6.3.6.2 UTILITIES: BRIGHTNESS 6.3.6.3 UTILITIES: LAMP 6.3.6.4 UTILITIES: 1:1 MANUAL SWITCH 6.3.6.5 UTILITIES: CIRCUIT ID FRONT PANEL LAMP TEST: XXXXXXX PRESS ENTER KEY TO FORCE UNIT INTO STANDBY (1:1 ONLY) 6.3.7 ODU 6.3.8 FAST 6.3.8.1 FAST: SET 6.3.8.2 FAST: VIEW Chapter 7. FORWARD ERROR CORRECTION OPTIONS 7.1 Introduction 7.2 Viterbi 7.3 Sequential 7.4 Reed-Solomon Outer Codec Page 7.5 Trellis Coding (FAST Option) 7.6 Turbo Product Codec (Hardware Option) 7.7 TPC and Low Density Parity Check (LDPC) coding 7.7.1 Introduction 7.7.2 LDPC versus TPC Page 7.7.3 End-to-End Processing Delay Page 7.8 Uncoded Operation (No FEC) Page Viterbi Decoding Sequential Decoding 64 kbps Sequential Decoding 1024 kbps Sequential Decoding 2048 kbps Viterbi with concatenated RS 220,200 Outer Code Sequential with concatenated RS 220,200 Outer Code 512 kbps 8-PSK/TC M Rate 2/3 Decoding, with and without 219, 201 RS Outer Code Comtech Turbo Product Codec Rate 3/4 QPS K/OQPS K, 8-PSK and 16-QAM Comtech Turbo Product Codec Rate 7/8 QPSK /OQPS K, 8-PSK and 16-QAM Comtech Turbo Product Codec Rate 1/2 QPSK/OQPSK Rate 0.95 QPSK/OQPSK and 8-PSK Comtech Turbo Product Codec Rate 21/44 BPSK Rate 5/16 BPSK 16-QAM Viterbi, Rate 3/ 4 and Rate 7/8 with 220,200 RS Outer Code Differential Encoding - No FEC, no scrambling Figure 7-14. LDPC, Rate 1/2, BPSK, (O)QPSK LDPC, BPSK, QPSK, (O)QPSK, Rate 1/2 Figure 7-15. LDPC, Rate 2/3, (O)QPSK/8-PSK/8-QAM LDPC Rate 2/3 QPSK/OQPSK/8-PSK/ 8-QAM Figure 7-16. LDPC, Rate 3/4, (O)QPSK/8-QAM 8910 11 12 1234567 LDPC, Rate 3/4 QPSK/OQPSK/ 8-QAM Figure 7-17. LDPC, Rate 3/4, 8-PSK / 8-QAM 8910 11 12 1234567 LDPC Rate 3/4 8-PSK/16-QAM Tyical limit 8-PSK Rate 3/4 Page Chapter 8. OFFSET QPSK OPERATION Page Chapter 9. OPEN NETWORK OPERATIONS 9.1 Introduction 9.2 IBS 9.2.1 IBS Clock/data recovery and De-jitter 9.2.2 IBS Framing 9.2.3 IBS Engineering Service Channel 9.2.4 IBS Scrambling 9.3 Drop and Insert 9.3.1 D&I Primary Data Interfaces 9.3.2 D&I Framing 9.4 IDR 9.4.1 IDR Primary Data Interfaces 9.4.2 IDR Engineering Service Channel Page Chapter 10. CLOCK MODES AND DROP AND INSERT (D&I) 10.1 Transmit Clocking 10.1.1 Internal Clock 10.1.2 Tx Terrestrial 10.1.3 Rx Loop-Timed, RX=TX 10.1.4 Rx Loop-Timed, RX<>TX (Asymmetric Loop Timing) 10.1.5 External Clock Page Page Page 10.4 Drop and Insert 10.5 Frame Formats 10.6 Time Slot Selection 10.7 Drop and Insert Clocking 10.8 Rx Buffer Clock = Insert (D&I only) 10.9 Single-Source Multiple Modems Page Page Chapter 11. EDMAC CHANNEL 11.1 Theory Of Operation 11.2 M&C Connection 11.3 Setup Summary 11.4 Drop & Insert ++ Chapter 12. AUTOMATIC UPLINK POWER CONTROL 12.1 Introduction 12.2 Setting AUPC Parameters 12.2.1 Target Eb/No 12.2.2 Max Range 12.2.3 Alarm 12.2.4 Demod Unlock 12.3 Compensation Rate 12.4 Monitoring Chapter 13. ESC++ 13.1 Introduction 13.2 Overhead Details 13.3 Available Baud Rates 13.4 Configuration 13.5 Effect on Eb/No performance Chapter 14. FLASH UPGRADING Page 151 Chapter 15. SUMMARY OF SPECIFICATIONS 15.1 Modulator CDM-600 Satellite Modem Revision 7 Summary of Specifications MN/CDM600.IOM 152 CDM-600 Satellite Modem Revision 7 Remote Control MN/CDM600.IOM 153 Comtech EF Data CDM-600 Transmit Power Spectral Density, referred to symbol rate 15.2 Demodulator Data rate range, operating modes, de-scrambling, input impedance/return loss etc, as per Modulator CDM-600 Satellite Modem Revision 7 Summary of Specifications MN/CDM600.IOM 154 CDM-600 Satellite Modem Revision 7 Remote Control MN/CDM600.IOM 155 CDM-600 Satellite Modem Revision 7 Summary of Specifications MN/CDM600.IOM 156 15.3 Data Interfaces CDM-600 Satellite Modem Revision 7 Remote Control MN/CDM600.IOM 157 15.4 Automatic Uplink Power Control 15.5 Framing Summary CDM-600 Satellite Modem Revision 7 Summary of Specifications MN/CDM600.IOM 158 15.6 Data Rate Ranges CDM-600 Satellite Modem Revision 7 Remote Control MN/CDM600.IOM 159 15.7 Miscellaneous 15.8 Approvals Page Chapter 16. REMOTE CONTROL 16.1 Introduction 16.2 EIA-485 16.3 EIA-232 16.4 Basic Protocol 16.5 Packet Structure 16.5.1 Start Of Packet 16.5.2 Address 16.5.3 Instruction Code 16.5.4 Instruction Code Qualifier 16.5.5 Message Arguments 16.5.6 End Of Packet 16.6 Alphabetical list of Remote Commands Exception: Select DROP or D&I++ mode using TFM (Transmit Framing type) which is highest priority Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Eb/No = 10 log10 (10 (Co+No/No )/10) -1) - 10 log10 (FEC Code Rate) - 10 log10 (bits/symbol) CDM-600 Satellite Modem Revision 7 Eb/No Measurement MN/CDM600.IOM B3 Page Appendix C. FAST Activation Procedure C.1 Introduction C.2 Activation Procedure C.2.1 Serial Number C.2.2 View currently installed features C.2.3 Enter Access Codes Appendix D. ODU OPERATION D.1 Introduction D.2 MENU TREES D.2.1 MODEM MAIN MENU D.2.2 ODU D.2.3 (ODU) ENABLE, 1:1 D.2.4 (ODU,ENABLE,1:1) REDUNDANCY BOX D.2.5 (ODU,ENABLE,1:1) CSAT#1 (ODU,ENABLE,1:1) CSAT#2 (ODU,ENABLE,STANDALONE CSAT) Page Page Page Page Page Page Page Page Page D.2.29 (ODU,ENABLE,STANDALONE KST,CONFIG) TX D.2.30 (ODU,ENABLE,STANDALONE KST,CONFIG) RX D.2.31 (ODU,ENABLE,STANDALONE KST,CONFIG) MISC D.2.32 (ODU,ENABLE,STANDALONE KST) INFORMATION D.2.33 (ODU,ENABLE,STANDALONE KST,INFO) MODEL D.2.34 (ODU,ENABLE,STANDALONE KST,INFO) TX+RX-PARAM D.2.35 (ODU,ENABLE,STANDALONE KST,INFO) MISC D.2.36 (ODU,ENABLE,STANDALONE KST,INFO) NUMBERS D.2.37 (ODU,ENABLE,STANDALONE KST) ALARMS Index Page Page Page CDM-600 Open Network Satellite Modem Manual Addendum A New Features/Changes 6.1 Description of D&I with ESC and AUPC Page METRIC CONVERSIONS Units of Length Temperature Conversions Units of Weight 2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161