Comtech EF Data CDM-Qx Installation And Operation Manual
with DoubleTalk™ Carrier-in-Carrier
Installation and Operation Manual
(Includes data for the CDM-Qx and CDM-QxL Configurations)
CDM-Qx
Multi-Channel Satellite Modem
®
IMPORTANT NOTE: The information contained in this document supersedes all previously published
information regarding these products. Product specifications are subject to change without prior notice.
For Firmware Versions 1.6.6/2.1.5 or higher
(see New in this Release – Section 1.4)
Part Number MN/CDMQX.IOM Revision 7
CDM-Qx
Multi-Channel Satellite Modem
with DoubleTalk™
Carrier-in-Carrier
Installation and Operation Manual
(Includes data for the CDM-Qx and CDM-QxL Configurations)
For Firmware Versions 1.6.6/2.1.5 or higher
(see New in this Release – Section 1.4)
Part Number MN/CDMQx.IOM
Revision 6
December 17, 2009
Comtech EF Data, 2114 West 7th Street, Tempe, Arizona 85281 USA, 480.333.2200, FAX: 480.333.2161
Copyright © Comtech EF Data, 2009. All rights reserved. Printed in the USA.
®
This page is intentionally blank.
Table of Contents
TABLE OF CONTENTS ................................................................................................. III
TABLES ........................................................................................................................ XII
FIGURES ...................................................................................................................... XII
PREFACE .................................................................................................................... XV
About this Manual ...................................................................................................................... xv
Reporting Comments or Suggestions Concerning this Manual ................................................ xv
Conventions and References ...................................................................................................... xv
Trademarks .............................................................................................................................. xvi
Electrical Safety ......................................................................................................................... xvi
Fuses ........................................................................................................................................ xvi
Environmental ......................................................................................................................... xvii
Installation............................................................................................................................... xvii
EMC (Electromagnetic Compatibility) .................................................................................. xviii
Warranty Policy .......................................................................................................................... xx
Limitations of Warranty ............................................................................................................ xx
Exclusive Remedies ................................................................................................................. xxi
Customer Support ..................................................................................................................... xxii
Online Customer Support ....................................................................................................... xxii
CHAPTER 1. INTRODUCTION ................................................................................ 1–1
1.1 Overview ........................................................................................................................ 1–1
1.1.1 Standard and Optional Features .................................................................................. 1–1
1.1.2 DoubleTalk™ Carrier-in-Carrier® .............................................................................. 1–2
1.1.3 Turbo Product Coding................................................................................................. 1–2
1.2 Functional Description ................................................................................................. 1–3
1.3 Features .......................................................................................................................... 1–5
1.3.1 Physical Description ................................................................................................... 1–5
1.3.2 Compatibility .............................................................................................................. 1–5
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1.3.3 Major Assemblies ....................................................................................................... 1–5
1.3.4 Dimensional Envelope ................................................................................................ 1–6
1.3.5 Physical Features ........................................................................................................ 1–6
1.3.5.1 Front Panel .......................................................................................................... 1–6
1.3.5.2 Rear Panel ........................................................................................................... 1–7
1.3.6 Hardware Options ....................................................................................................... 1–8
1.3.6.1 CDM-Qx/QxL Hardware Options ...................................................................... 1–8
1.3.6.2 CDM-QxL L-Band.............................................................................................. 1–9
1.3.7 Data Interfaces ............................................................................................................ 1–9
1.3.8 Verification ................................................................................................................. 1–9
1.3.9 AUPC .......................................................................................................................... 1–9
1.3.10 EDMAC ................................................................................................................ 1–10
1.3.11 Flash Upgrading Modem Firmware ...................................................................... 1–10
1.3.12 Fully Accessible System Topology (FAST) ......................................................... 1–11
1.3.13 Supporting Hardware and Software ...................................................................... 1–12
1.4 New in this Release...................................................................................................... 1–13
1.4.1 CDM-Qx/QxL Firmware Release Notes .................................................................. 1–13
1.5 Summary of Specifications ......................................................................................... 1–14
1.5.1 Modulator .................................................................................................................. 1–14
1.5.2 Demodulator ............................................................................................................. 1–15
1.5.3 Data Interfaces .......................................................................................................... 1–18
1.5.4 Automatic Uplink Power Control ............................................................................. 1–18
1.5.5 Data Rate Ranges ...................................................................................................... 1–19
1.5.6 Framing Summary (Future) ...................................................................................... 1–19
1.5.7 Miscellaneous ........................................................................................................... 1–20
1.5.8 Approvals .................................................................................................................. 1–20
CHAPTER 2. INSTALLATION ................................................................................. 2–1
2.1 Unpacking ...................................................................................................................... 2–1
2.2 Mounting ........................................................................................................................ 2–2
2.2.1 Method A: Optional Rear-Mounting Support Brackets .............................................. 2–2
2.2.2 Method B: Optional Bearingless Side-Railings .......................................................... 2–4
2.3 Configuration ................................................................................................................ 2–4
2.4 Select Internal IF Loop ................................................................................................. 2–5
2.5 Connect External Cables .............................................................................................. 2–5
CHAPTER 3. REAR PANEL CONNECTORS ......................................................... 3–1
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3.1 Connector Overview ..................................................................................................... 3–1
3.2 Base Chassis Connections............................................................................................. 3–4
3.2.1 Power Connector ......................................................................................................... 3–4
3.2.1.1 AC Power Connector .......................................................................................... 3–4
3.2.1.2 DC Power Supply (CDM-QxL, Optional) .......................................................... 3–4
3.2.2 Ground Connector ....................................................................................................... 3–4
3.2.3 M&C 10/100BaseT Connector ................................................................................... 3–5
3.2.4 485/232 Connector ...................................................................................................... 3–5
3.2.5 Tx and Rx IF Connectors ............................................................................................ 3–5
3.2.6 Ext Ref Connector....................................................................................................... 3–5
3.3 Data Interface Connectors ........................................................................................... 3–6
3.3.1 Typical Alarms Connector .......................................................................................... 3–6
3.3.2 Balanced G.703 Connector Tx/Rx Connector ............................................................ 3–7
3.3.3 Unbalanced G.703 Tx/Rx Connectors ....................................................................... 3–7
3.3.4 EIA-530 Data Interface Connector ............................................................................. 3–8
3.3.5 Quad E1 Data Interface Connectors ........................................................................... 3–9
3.3.6 HSSI Interface and Connectors ................................................................................. 3–10
3.3.6.1 HSSI Interface Specifications ........................................................................... 3–11
3.3.6.2 HSSI Connector Pin Assignments .................................................................... 3–12
CHAPTER 4. FLASH UPGRADING ........................................................................ 4–1
4.1 Flash Updating via Internet ......................................................................................... 4–1
4.2 Ethernet FTP Upload Procedure ................................................................................. 4–2
CHAPTER 5. FRONT PANEL OPERATION ........................................................... 5–1
5.1 Front Panel Overview ................................................................................................... 5–1
5.1.1 USB Port ..................................................................................................................... 5–1
5.1.2 LED Indicators ............................................................................................................ 5–2
5.1.3 Keypad ........................................................................................................................ 5–3
5.1.4 Front Panel Vacuum Fluorescent Display (VFD) ....................................................... 5–4
5.1.4.1 VFD – Left-hand Display Area........................................................................... 5–4
5.1.4.1.1 Modems ......................................................................................................... 5–5
5.1.4.1.2 Redundancy ................................................................................................... 5–5
5.1.4.1.3 Spectrum Analyzer ........................................................................................ 5–6
5.1.4.2 VFD – Right-Hand Display Area ....................................................................... 5–6
5.2 Front Panel Operation – Opening Screen .................................................................. 5–6
5.3 MAIN MENU Screen .................................................................................................... 5–8
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5.4 (MAIN MENU:) Config (Configuration) .................................................................... 5–9
5.4.1 CONFIG: Remote ..................................................................................................... 5–10
5.4.1.1 CONFIG: Remote Æ Local .............................................................................. 5–10
5.4.1.2 CONFIG: Remote Æ Serial .............................................................................. 5–10
5.4.1.3 CONFIG: Remote Æ Ethernet .......................................................................... 5–11
5.4.2 CONFIG: Tx (Transmit) ........................................................................................... 5–13
5.4.2.1 CONFIG: Tx Æ FEC ........................................................................................ 5–14
5.4.2.2 CONFIG: Tx Æ Mod ........................................................................................ 5–14
5.4.2.3 CONFIG: Tx Æ Code ....................................................................................... 5–15
5.4.2.4 CONFIG: Tx Æ Data ........................................................................................ 5–15
5.4.2.5 CONFIG: Tx Æ Freq ........................................................................................ 5–17
5.4.2.6 CONFIG: Tx Æ On/Off .................................................................................... 5–18
5.4.2.7 CONFIG: Tx Æ PWR ...................................................................................... 5–18
5.4.2.8 CONFIG: Tx Æ Scram ..................................................................................... 5–20
5.4.2.9 CONFIG: Tx Æ Clk ......................................................................................... 5–20
5.4.2.10 CONFIG: Tx Æ Inv ...................................................................................... 5–21
5.4.2.11 CONFIG: Tx Æ Txα .................................................................................... 5–21
5.4.3 CONFIG: Rx (Receive) ............................................................................................ 5–22
5.4.3.1 CONFIG: Rx Æ FEC ........................................................................................ 5–23
5.4.3.2 CONFIG: Rx Æ Demod ................................................................................... 5–23
5.4.3.3 CONFIG: Rx Æ Code ...................................................................................... 5–24
5.4.3.4 CONFIG: Rx Æ Data ....................................................................................... 5–24
5.4.3.5 CONFIG: Rx Æ Freq ........................................................................................ 5–25
5.4.3.6 CONFIG: Rx Æ Acq ........................................................................................ 5–26
5.4.3.7 CONFIG: Rx Æ Descram ................................................................................. 5–26
5.4.3.8 CONFIG: Rx Æ Buf ......................................................................................... 5–27
5.4.3.9 CONFIG: Rx Æ Inv .......................................................................................... 5–28
5.4.3.10 CONFIG: Rx Æ Misc ................................................................................... 5–28
5.4.3.11 CONFIG: Rx Æ CnC (CARRIER-IN-CARRIER®) .................................... 5–29
5.4.4 CONFIG: Group ....................................................................................................... 5–30
5.4.4.1 CONFIG: Group Æ Modem ............................................................................. 5–30
5.4.4.2 CONFIG: Group Æ Redundancy ..................................................................... 5–30
5.4.5 CONFIG: Frame ....................................................................................................... 5–32
5.4.5.1 CONFIG: Frame Æ Unframed ......................................................................... 5–32
5.4.5.2 CONFIG: Frame Æ EDMAC, EDMAC-2 ....................................................... 5–32
5.4.5.3 CONFIG: Frame Æ D&I++ .............................................................................. 5–33
5.4.6 CONFIG: Interface ................................................................................................... 5–34
5.4.6.1 CONFIG: Interface Æ RS422, V.35, RS232 .................................................... 5–34
5.4.6.2 CONFIG: Interface Æ HSSI ............................................................................. 5–34
5.4.6.3 CONFIG: Interface Æ G.703 ........................................................................... 5–35
5.4.6.4 CONFIG: Interface Æ QDI .............................................................................. 5–36
5.4.7 CONFIG: Ref ............................................................................................................ 5–37
5.4.8 CONFIG: Mask ......................................................................................................... 5–38
5.4.8.1 CONFIG: Mask Æ Transmit ............................................................................ 5–38
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5.4.8.2 CONFIG: Mask Æ Receive .............................................................................. 5–38
5.4.8.3 CONFIG: Mask Æ Reference........................................................................... 5–39
5.4.8.4 CONFIG: Mask Æ BUC (CDM-QxL only) ..................................................... 5–39
5.4.8.5 CONFIG: Mask Æ BUC (CDM-QxL only) ..................................................... 5–39
5.4.9 CONFIG: ODU ......................................................................................................... 5–39
5.4.9.1 CONFIG: ODU Æ BUC ................................................................................... 5–39
5.4.9.2 CONFIG: ODU Æ LNB ................................................................................... 5–42
5.5 (MAIN MENU:) Monitor ........................................................................................... 5–44
5.5.1 MONITOR: Alarms .................................................................................................. 5–44
5.5.1.1 MONITOR: Alarms Æ Transmit ...................................................................... 5–44
5.5.1.2 MONITOR: Alarms Æ Receive ....................................................................... 5–44
5.5.1.3 MONITOR: Alarms Æ Unit ............................................................................. 5–44
5.5.1.4 MONITOR: Alarms Æ ODU ........................................................................... 5–45
5.5.2 MONITOR: Rx-Params ............................................................................................ 5–45
5.5.3 MONITOR: Event-Log ............................................................................................. 5–45
5.5.3.1 MONITOR: Event-Log Æ View ...................................................................... 5–46
5.5.3.2 MONITOR: Event-Log Æ Clear-All ................................................................ 5–46
5.5.4 MONITOR: Stats ...................................................................................................... 5–47
5.5.4.1 MONITOR: Stats Æ View ............................................................................... 5–47
5.5.4.2 MONITOR: Stats Æ Clear-All ......................................................................... 5–48
5.5.4.3 MONITOR: Stats Æ Config ............................................................................. 5–48
5.5.5 MONITOR: AUPC ................................................................................................... 5–48
5.5.6 MONITOR: CnC (Carrier-in-Carrier®) .................................................................... 5–49
5.5.7 MONITOR: ODU ..................................................................................................... 5–50
5.5.7.1 MONITOR: ODU Æ BUC ............................................................................... 5–50
5.5.7.2 MONITOR: ODU Æ LNB ............................................................................... 5–50
5.6 (MAIN MENU:) Test .................................................................................................. 5–51
5.6.1 TEST: Mode.............................................................................................................. 5–51
5.6.2 TEST: BIST .............................................................................................................. 5–52
5.6.2.1 TEST: BIST Æ BERT-Config .......................................................................... 5–52
5.6.2.2 TEST: BIST Æ BERT-Mon ............................................................................. 5–53
5.6.2.3 TEST: BIST Æ BERT-Control ........................................................................ 5–53
5.6.3 TEST: Spec-Analyzer ............................................................................................... 5–53
5.7 (MAIN MENU:) Info (Information).......................................................................... 5–54
5.7.1 INFO: Rem................................................................................................................ 5–54
5.7.2 INFO: Tx ................................................................................................................... 5–55
5.7.3 INFO: Rx .................................................................................................................. 5–56
5.7.4 INFO: Buffer ............................................................................................................. 5–56
5.7.5 INFO: Frame ............................................................................................................. 5–57
5.7.6 INFO: Interface ......................................................................................................... 5–57
5.7.7 INFO: Mask .............................................................................................................. 5–57
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5.7.8 INFO: Ref ................................................................................................................. 5–57
5.7.9 INFO: ID ................................................................................................................... 5–57
5.8 (MAIN MENU:) Save/Load ....................................................................................... 5–58
5.8.1 INFO: SAVE/LOAD Æ Save ................................................................................... 5–58
5.8.2 INFO: SAVE/LOAD Æ Load .................................................................................. 5–58
5.9 (MAIN MENU:) Utility .............................................................................................. 5–59
5.9.1 UTILITY: RxBuffer .................................................................................................. 5–59
5.9.2 UTILITY: Clock ....................................................................................................... 5–59
5.9.3 UTILITY: Ref ........................................................................................................... 5–60
5.9.4 UTILITY: ID ............................................................................................................ 5–60
5.9.5 UTILITY: Display .................................................................................................... 5–60
5.9.6 UTILITY: Firmware ................................................................................................. 5–61
5.9.6.1 UTILITY: Firmware Æ Update-CPLD ............................................................ 5–61
5.9.6.2 UTILITY: Firmware Æ Information ................................................................ 5–61
5.9.6.3 UTILITY: Firmware Æ Select ......................................................................... 5–62
5.9.7 UTILITY: FAST ....................................................................................................... 5–63
CHAPTER 6. ETHERNET MANAGEMENT ............................................................. 6–1
6.1 Introduction ................................................................................................................... 6–1
6.2 Ethernet Management Interface Protocols ................................................................ 6–1
6.3 SNMP Interface ............................................................................................................. 6–1
6.3.1 Management Information Base (MIB) Files ............................................................... 6–2
6.3.2 SNMP Community Strings ......................................................................................... 6–2
6.3.3 SNMP Traps................................................................................................................ 6–2
6.4 Telnet Interface ............................................................................................................. 6–4
6.5 Web Server (HTTP) Interface ..................................................................................... 6–6
6.5.1 Web Server Introduction ............................................................................................. 6–6
6.5.2 Web Server Menu Tree ............................................................................................... 6–6
6.5.3 User Login .................................................................................................................. 6–7
6.5.4 Web Server Page Descriptions .................................................................................... 6–8
6.5.4.1 Home Page .......................................................................................................... 6–8
6.5.4.1.1 Home | Home Page ........................................................................................ 6–8
6.5.4.1.2 Home | Contact Page ..................................................................................... 6–9
6.5.4.1.3 Home | Support Page ................................................................................... 6–10
6.5.4.2 Admin Pages ..................................................................................................... 6–11
6.5.4.2.1 Admin | Access Page ................................................................................... 6–11
6.5.4.2.2 Admin | Remote Page .................................................................................. 6–13
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6.5.4.3 Config Mdm (Configure Modem) Pages .......................................................... 6–14
6.5.4.3.1 Config Mdm | Quick View .......................................................................... 6–14
6.5.4.3.1.1 Config Mdm | Quick View | Config Pages ........................................... 6–16
6.5.4.3.1.2 Config Mdm | Quick View | Status Pages ............................................ 6–20
6.5.4.3.1.3 Config Mdm | Quick View | Test Pages ............................................... 6–24
6.5.4.3.1.4 Config Mdm | Quick View | Utility Pages ........................................... 6–28
6.5.4.3.2 Config Mdm | Unit Status Page ................................................................... 6–33
6.5.4.4 ODU (Outdoor Unit) Pages (CDM-QxL only) ................................................. 6–34
6.5.4.4.1 ODU | BUC (Block Up Converter) Page .................................................... 6–34
6.5.4.4.2 Config | LNB (Low Noise Block Down Converter) Page .......................... 6–35
6.5.4.5 Maint (Maintenance) Page ................................................................................ 6–36
CHAPTER 7. FORWARD ERROR CORRECTION OPTIONS ............................... 7–1
7.1 Introduction ................................................................................................................... 7–1
7.2 Viterbi ............................................................................................................................ 7–1
7.3 Reed-Solomon Outer Codec ......................................................................................... 7–2
7.3.1 Closed Network Modes ............................................................................................... 7–3
7.4 Trellis Coding ................................................................................................................ 7–3
7.5 Turbo Product Codec (Hardware Option) ................................................................. 7–4
7.5.1 Introduction ................................................................................................................. 7–4
7.5.2 The Evolution of TPC in Comtech Products .............................................................. 7–5
7.5.3 End-to-End Processing Delay ..................................................................................... 7–5
7.5.4 Comparison of all TPC Modes ................................................................................... 7–6
CHAPTER 8. AUTOMATIC UPLINK POWER CONTROL (AUPC) ........................ 8–1
8.1 Introduction ................................................................................................................... 8–1
8.2 Setting AUPC Parameters ............................................................................................ 8–1
8.2.1 AUPC Target Eb/N0 .................................................................................................... 8–2
8.2.2 AUPC Max Range ...................................................................................................... 8–2
8.2.3 AUPC Alarm ............................................................................................................... 8–2
8.2.4 Demod Unlock ............................................................................................................ 8–2
8.3 Compensation Rate ....................................................................................................... 8–3
8.4 Monitoring ..................................................................................................................... 8–3
CHAPTER 9. DOUBLETALK
TM
CARRIER-IN-CARRIER® (CNC) ........................... 9–1
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9.1 What is DoubleTalk Carrier-in-Carrier? ................................................................... 9–1
9.2 Application Requirements............................................................................................ 9–1
9.3 System Functionality .................................................................................................... 9–2
9.4 CnC Performance Characterization ........................................................................... 9–4
9.4.1 Degradation Due To Carrier Spacing ......................................................................... 9–4
9.4.2 Selecting The Adjacent Carrier Curve ........................................................................ 9–7
9.4.3 Carrier-in-Carrier® Ratio (CnC Ratio) ........................................................................ 9–8
9.4.4 Symbol Rate Ratio ...................................................................................................... 9–9
9.4.5 CnC Carrier Offset .................................................................................................... 9–10
9.4.6 1st CnC Example: Adjacent Carriers, CnC Ratio and Rain Fade .............................. 9–10
9.4.7 2nd CnC Example: CnC Ratio With Asymmetric Links ........................................... 9–12
9.4.8 3rd CnC Example: Asymmetric Link With Rain Fade .............................................. 9–13
CHAPTER 10. EDMAC CHANNEL ........................................................................ 10–1
10.1 Theory Of Operation .................................................................................................. 10–1
10.2 M&C Connection ........................................................................................................ 10–2
10.3 Setup Summary ........................................................................................................... 10–3
CHAPTER 11. REDUNDANCY .............................................................................. 11–1
APPENDIX A. CABLE DRAWINGS ......................................................................... A-1
A.1 Introduction ................................................................................................................... A-1
A.1.1 EIA-530 to RS-422/449 Data Cable ....................................................................... A-2
A.1.2 EIA-530 to V.35 Data Cable ................................................................................... A-3
A.1.3 EIA-530 Conversion Cable ..................................................................................... A-4
A.1.4 Switch Programming Cable .................................................................................... A-5
APPENDIX B. FAST ACTIVATION PROCEDURE ................................................. B–1
B.1 Introduction ................................................................................................................... B–1
B.2 Activation Procedure .................................................................................................... B–1
B.2.1 Obtain Serial Numbers ............................................................................................ B–1
B.2.2 View Currently Installed FAST Features ............................................................... B–3
B.2.2.1 View Base Unit FAST Features .......................................................................... B–3
B.2.2.2 View Installed Module (Mod/Demod, Turbo) FAST Features .......................... B–4
B.2.3 Acquire FAST Code ............................................................................................... B–5
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B.2.4 Enter FAST Codes .................................................................................................. B–5
B.2.4.1 Entering the Base Unit FAST CODE ................................................................. B–5
B.2.4.2 Entering the Installed Module FAST CODE ...................................................... B–6
B.2.4.3 Entering the Installed Module TPC Board FAST CODE ................................... B–6
APPENDIX C. REMOTE CONTROL ....................................................................... C–1
C.1 Overview ....................................................................................................................... C–1
C.2 EIA-485 ......................................................................................................................... C–1
C.3 EIA-232 ......................................................................................................................... C–2
C.4 Basic Protocol ............................................................................................................... C–2
C.5 Packet Structure ........................................................................................................... C–2
C.5.1 Start of Packet ......................................................................................................... C–3
C.5.2 Target Address ........................................................................................................ C–3
C.5.3 Address Delimiter ................................................................................................... C–3
C.5.4 Instruction Code ...................................................................................................... C–3
C.5.5 Instruction Code Qualifier ...................................................................................... C–3
C.5.6 Optional Message Arguments ................................................................................. C–5
C.5.7 End of Packet .......................................................................................................... C–5
C.6 Remote Commands and Queries ................................................................................ C–5
C.6.1 Transmit (Tx) Commands and Queries................................................................... C–7
C.6.2 Receive (Rx) Commands and Queries .................................................................. C–11
C.6.3 Common (Tx, Rx, or Modem) Commands and Queries ....................................... C–15
C.6.4 Queries .................................................................................................................. C–24
C.6.5 Bulk Commands and Queries ............................................................................... C–32
C.6.6 BUC Commands and Queries – CDM-QxL ONLY ............................................. C–33
C.6.7 LNB Commands and Queries – CDM-QxL ONLY ............................................. C–36
C.6.8 Built-in BERT Commands and Queries (BER Tester) ......................................... C–37
C.6.9 Spectrum Analyzer Commands and Queries – Rx Module ONLY ...................... C–39
C.6.10 D&I++ (Drop & Insert) Commands and Queries (E1 CCS Only) – Modem ONLY ..... C–40
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Tables
Table 1-1. CDM-Qx/QxL Rear Panel Connectors – Base Chassis ............................................. 1–8
Table 1-2. FAST and FAST-accessible Hardware Options ...................................................... 1–12
Table 3-1. Rear Panel External Connections .............................................................................. 3–3
Table 3-2. 485/232 (Remote Control) Connector Pin Assignments ........................................... 3–5
Table 3-3. Alarms Interface Connector Pin Assignments .......................................................... 3–6
Table 3-4. Balanced G.703 Interface Connector Pin Assignments ............................................ 3–7
Table 3-5. RS-530 Data Interface Connector Pin Assignments ................................................. 3–8
Table 3-6. Quad E1 Data Interface J1-J4 Connector Pin Assignments ...................................... 3–9
Table 3-7. Quad E1 Clock Interface J5, DB-9F Connector Pin Assignments ............................ 3–9
Table 5-1. Prinicpal Menu Tree .................................................................................................. 5–7
Table 6-1. Viterbi Decoding Summary ....................................................................................... 7–2
Table 6-2. Concatenated Reed-Solomon Coding Summary ....................................................... 7–3
Table 6-3. 8-PSK/TCM Coding Summary ................................................................................. 7–4
Table 6-4. Available TPC Modes ............................................................................................... 7–5
Table 6-5. Turbo Product Coding processing delay comparison ................................................ 7–6
Table 6-6. Turbo Product Coding Summary ............................................................................... 7–7
Table 9-1. Rain Fade Degradation ............................................................................................ 9–11
Table 9-2. Link Parameters / Results ........................................................................................ 9–13
Table 9-3. Eb/No Degradation For Asymmetric 4.5-Meter Antenna At Site ‘A’ and 2.4-Meter
Antenna At Site ‘B’ .......................................................................................................... 9–14
Figures
Figure 1-1. CDM-Qx/QxL Multi-Channel Satellite Modem (CDM-QxL shown) ................................... 1–1
Figure 1-2. CDM-Qx/QxL Open Network Satellite Modem Block Diagrams ......................................... 1–4
Figure 1-3. CDM-Qx/QxL Dimensional Envelope ................................................................................... 1–6
Figure 1-4. Front Panel View (CDM-Qx shown) ..................................................................................... 1–6
Figure 1-5. CDM-Qx/QxL Rear Panel View ............................................................................................ 1–7
Figure 1-6. Power Spectral Density Chart ............................................................................................. 1–15
Figure 2-1. Installation of Optional Rear-Mounting Support Brackets .................................................... 2–3
Figure 2-2. Installation of Optional Side-Railings (FP/SL0006) ............................................................. 2–4
Figure 3-1. CDM-Qx/QxL Rear Panel Configuration Examples .............................................................. 3–1
Figure 3-2. HSSI Interface Block Diagram ............................................................................................ 3–10
Figure 3-3. HSSI Interface Example ....................................................................................................... 3–11
Figure 4-1. Flash Update via Internet ....................................................................................................... 4–1
Figure 5-1. CDM-Qx/QxL – Front Panel View ........................................................................................ 5–1
Figure 5-2. CDM-Qx/QxL Keypad ........................................................................................................... 5–3
Figure 5-3. Loopback .............................................................................................................................. 5–51
Figure 6-1. CDM-Qx/QxL Multi-Channel Satellite Modem Home page ................................................. 6–8
Figure 6-2. Home | Contact Information page .......................................................................................... 6–9
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Figure 6-3. Home | Customer Support page ............................................................................................ 6–10
Figure 6-4. Admin | Access page ............................................................................................................ 6–11
Figure 6-5. Admin | Remote page ........................................................................................................... 6–13
Figure 6-6. Config Mdm | Quick View Page Example ........................................................................... 6–14
Figure 6-7. Configuration Icon Group Examples ................................................................................... 6–15
Figure 6-8. ‘Config Mdm | Quick View | Config’ Nested Pages – Base, Tx .......................................... 6–16
Figure 6-9. ‘Config Mdm | Quick View | Config’ Nested Pages – Rx, MD ........................................... 6–17
Figure 6-10. ‘Config Mdm | Quick View | Status’ Nested Pages – Base, Tx ......................................... 6–20
Figure 6-11. ‘Config Mdm | Quick View | Status’ Nested Pages – Rx, MD .......................................... 6–21
Figure 6-12. ‘Config Mdm | Quick View | Test’ Nested Pages – Base, Tx ............................................ 6–24
Figure 6-13. ‘Config Mdm | Quick View | Test’ Nested Pages – Rx, MD ............................................. 6–25
Figure 6-14. Nested Test Page with Spectrum Analyzer Mode ‘On’ – Rx, MD .................................... 6–27
Figure 6-15. ‘Config Mdm | Quick View | Utility’ Nested Pages – Base, Tx ......................................... 6–28
Figure 6-16. ‘Config Mdm | Quick View | Utility’ Nested Pages – Rx, MD .......................................... 6–29
Figure 6-17. Config Mdm | Unit Status Page .......................................................................................... 6–33
Figure 6-18. ODU | BUC page ................................................................................................................ 6–34
Figure 6-19. ODU | LNB page ................................................................................................................ 6–35
Figure 6-20. Maint | Unit Info page ........................................................................................................ 6–36
Figure 6-1. Viterbi Decoding .................................................................................................................... 7–8
Figure 6-2. Viterbi with Concatenated R-S Outer Code ........................................................................... 7–9
Figure 6-3. 8-PSK/TCM Rate 2/3 with and without concatenated R-S Outer Code .............................. 7–10
Figure 6-4. Comtech EF Data Turbo Product Codec Rate 3/4 QPSK, 8-PSK and 16-QAM ................. 7–11
Figure 6-5. Comtech EF Data Turbo Product Codec Rate 7/8 QPSK, 8-PSK and 16-QAM ................. 7–12
Figure 6-6. Rate 1/2 QPSK, Rate 17/18 QPSK and Rate 17/18 8-PSK .................................................. 7–13
Figure 6-7. Rate 21/44 BPSK and Rate 5/16 BPSK Turbo ..................................................................... 7–14
Figure 6-8. 16-QAM Viterbi, Rate 3/4 and Rate 7/8 with 220,200 R-S Outer Code .............................. 7–15
Figure 9-1. Traditional FDMA System (without CnC) ............................................................................. 9–2
Figure 9-2. Same System Using CDM-Qx/QxL and DoubleTalk
Carrier-in-Carrier ............................... 9–2
Figure 9-3. Adjacent Carrier: Case A (As Tested) and Case B (As Plotted) ............................................ 9–5
Figure 9- 4 . QP S K 3/ 4 T ur b o d egradati o n v e rsus relati v e c ar r i e r s pa c in g ( f o r two adjacent c a r r ie r s ) ......... 9–6
Figure 9- 5 . 8- P S K 3/ 4 T ur bo d e g radation ve r s us r e lative car r ie r s pa c i n g ( f o r t w o a djacent car r i e r s) ......... 9–6
Figure 9- 6 . 1 6- Q A M 3/ 4 T ur b o d e gr a dation vers us r e l at i v e carrier spa c i n g (f o r t w o a d ja c e n t ca r r iers) ..... 9–6
Figure 9-7. Adjacent Carrier Cases ........................................................................................................... 9–7
Figure 9-8. CnC Ratio ............................................................................................................................... 9–8
Figure 9-9. CnC Ratio For QPSK and 8-PSK ........................................................................................... 9–9
Figure 9-10. CnC Ratio For 16-QAM ....................................................................................................... 9–9
Figure 9-11. CnC Example ..................................................................................................................... 9–10
Figure 9-12. Link With Fading At Site ‘A’ ............................................................................................ 9–11
Figure 9-13. Asymmetric Link (Same Data Rate, Different Antennas) .................................................. 9–12
Figure 11-1. CDM-Qx/QxL Chassis Rear Panel Schematic ................................................................... 11–1
Figure A-1. : EIA-530 to RS-422/449 DCE Conversion Cable (CA/WR0049) ...................................... A-2
Figure A-2. : EIA-530 to V.35 DCE Conversion Cable (CA/WR0059) .................................................. A-3
Figure A-3. EIA-530 DCE Conversion Cable (CA/WR9718-1) ............................................................. A-4
Figure A-4. Switch Programming Cable .................................................................................................. A-5
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xiv
About this Manual
PREFACE
This manual provides installation and operation information for the Comtech EF Data CDM-Qx
Multi-Channel Modem with DoubleTalk™ Carrier-in-Carrier
intended for earth station engineers, technicians, and operators responsible for the operation and
maintenance of the 70-140 MHz CDM-Qx and its L-Band counterpart, the CDM-QxL.
Revision 7 denotes a complete rewrite of the CDM-Qx Multi-Channel Satellite Mo dem Installation
and Operation Manual (CEFD P/N MN/C DMQX.IO M). It is intend ed replace al l previous version s
of this document in their entirety. All content has been reorganized and updated to conform to
current Comtech EF Data Technical Publications Standards and Practices.
®
. This is a technical document
Reporting Comments or Suggestions Concerning this Manual
Comments and suggestions regarding the content and design of this manual will be appreciated.
To submit comments, please contact the Comtech EF Data Technical Publications Department:
TechnicalPublications@comtechefdata.com
.
Conventions and References
Metric Conversion
Metric conversion information is located on the inside back cover of this manual. This information
is provided to assist the operator in cross-referencing non-metric to metric conversions.
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Cautions and Warnings
WARNING indicates a potentially hazardous situation that, if not avoided, could
result in death or serious injury.
CAUTION indicates a hazardous situation that, if not avoided, may result in minor
or moderate injury. CAUTION may also be used to indicate other unsafe practices
or risks of property damage.
IMPORTANT or NOTE indicates information critical for proper equipment function.
Recommended Standard Designations
Recommended Standard (RS) Designations have been superseded by the new designation of the
Electronic Industries Association (EIA). References to the old designations are shown only when
depicting actual text displayed on the screen of the unit (RS-232, RS-485, etc.). All other references
in the manual will be shown with the EIA designations.
Trademarks
Carrier-in-Carrier is a registered trademark of Comtech EF Data Corporation. DoubleTalk is a
trademark of Applied Signal Technology, Inc. Windows is a trademark of the Microsoft
Corporation. Other product names mentioned in this manual may be trademarks or registered
trademarks of their respective companies and are hereby acknowledged.
The user should carefully review the following information:
IMPORTANT
Electrical Safety
The CDM-Qx/QxL Multi-Channel Satellite Mod em has been shown to comply with safety standard
EN60950: Safety of Information Technology Equipment, including Electrical Business
Machines.
Observe the following: The CDM-Qx (70/140 MHz) is rated for operation over the range 100 to
240 VAC. It has a maximum power consumption of 120 watts, and draws a maximum of 1 amp.
The CDM-QxL (L-Band) is rated for operation over the range 100 to 240 VAC. It has a maximum
power consumption of 250 watts, and draws a maximum of 2 amps.
Fuses
FOR CONTINUED OPERATOR SAFETY, ALWAYS REPLACE THE FUSES WITH
CAUTION
THE CORRECT TYPE AND RATING.
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AC Operation: The AC-powered CDM-Qx/QxL 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.
For the CDM-Qx:
• For 115 and 230 VAC operation, use 2.0A, slow-blow 20mm fuses.
For the CDM-QxL:
• For 115 and 230 VAC operation, use T3.15A, slow-blow 20mm fuses.
DC Operation: The DC-powered CDM-Qx/QxL is fitted with one fuse for positive connection.
Thid fuse is contained within the body of the power inlet, behind a small plastic flap.
For the CDM-Qx:
• For 38 to 60 VDC operation, use X.XA, 20mm fuses.
For the CDM-QxL:
• For 38 to 60 VDC operation if the modem has no BUC power supply, use T3.15A,
slow-blow 20mm fuses
• For 38 to 60 VDC operation if the modem is fitted with internal BUC power supply,
use T8.0A, slow-blow 20mm fuses.
Environmental
The CDM-Qx/QxL must not be operated in an environment where the unit is exposed to extremes
of temperature outside the ambient range 0 to 50°C (32° to 122°F); precipitation, condensation, or
humid atmospheres above 95% RH; altitudes (non-pressurized) greater than 2000 meters;
excessive dust or vibration; flammable gases, corrosive or explosive atmospheres.
Operation in vehicles or other transportable installations that are equipped to provide a stable
environment is permitted. If such vehicles do not provide a stable environment, safety of the
equipment to EN60950 may not be guaranteed.
Installation
Do not plug in the modulator and demodulator cards while the modem
CAUTION
The CDM-Qx/QxL 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.
Examples of acceptable ratings for the cable include HAR, BASEC and HOXXX-X. Examples of
acceptable connector ratings include VDE, NF-USE, UL, CSA, OVE, CEBEC, NEMKO,
DEMKO, BS1636A, BSI, SETI, IMQ, KEMA-KEUR and SEV.
is powered on. Damage to the cards may result.
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International Symbols
Symbol Definition Symbol Definition
~
CDM-Qx/QxL AC Modem Installation: The installation and connection to the line supply must
be made in compliance to local or national wiring codes and regulations. The CDM-Qx/QxL is
designed for connection to a power system that has separate ground, line and neutral conductors.
The equipment is not designed for connection to a power system that has no direct connection to
ground.
CDM-Qx/QxL DC Modem Installation: The CDM-Qx/QxL DC input is connected to a nominal
48 VDC prime power source. The DC input is isolated from the chass is and from the DC output to
the BUC if equipped with internal BUC power supply. The chassis may be connected to a local
system ground using a separate wire to the ground stud on the back of the ch assis. Since the DC
input is isolated, either the positive or the negativ e side of the DC input may be common with local
ground. Labeling on the chassis rear panel indicates the positive and negative terminals of the input
power socket.
Alternating Current
Fuse
Protective Earth
Chassis Ground
Telecommunications Terminal Equipment Directive
In accordance with the Telecommunications Terminal Equipment Directive 91/263/EEC, this
equipment should not be directly connected to the Public Telecommunications Network.
CE Mark
Comtech EF Data declares that the CDM-Qx/QxL Multi-Channel Satellite Modem meets the
necessary requirements for the CE Mark.
RoHS Compliancy
This unit satisfies (with exemptions) the requirements specified in the European Union Directive on
the Restriction of Hazardous Substances, Directive 2002/95/EC, (EU RoHS).
EMC (Electromagnetic Compatibility)
In accordance with European Directive 89/336/EEC, the CDM-Qx/QxL Modem has been shown,
by independent testing, to comply with the following standards:
Emissions: EN 55022 Class B - Limits and methods of measurement of radio
interference characteristics of Information Technology Equipment.
(Also tested to FCC Part 15 Class B)
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Immunity: EN 50082 Part 1 - Generic immunity standard, Part 1: Domestic,
commercial and light industrial environment.
Additionally, the CDM-Qx/QxL has been shown to comply with the following standards:
EN 61000-3-2 Harmonic Currents Emission
EN 61000-3-3 Voltage Fluctuations and Flicker
EN 61000-4-2 ESD Immunity
EN 61000-4-4 EFT Burst Immunity
EN 61000-4-5 Surge Immunity
EN 61000-4-6 RF Conducted Immunity
EN 61000-4-8 Power frequency Magnetic Field Immunity
EN 61000-4-9 Pulse Magnetic Field Immunity
EN 61000-4-11 Voltage Dips, Interruptions, and Variations Immunity
EN 61000-4-13 Immunity to Harmonics
To ensure that the Modem continues to comply with these standards,
IMPORTANT
observe the following instructions:
• Connections to the transmit and receive IF ports (Type ‘BNC’ female connectors for the
CDM-Qx, Type ‘N’ female connectors for the CDM-QxL) should be made using a good
quality coaxial cable; e.g., RG58/U (50Ω) or RG59/U (75Ω).
• All 'D' type connectors attached to the rear panel must have back-shells that provide
continuous metallic shielding. Cable with a continuous outer shield (either foil or braid,
or both) must be used, and the shield must be bonded to the back-shell.
• The equipment must be operated with its cover on at all times. If it becomes necessary to
remove the cover, the user should ensure that the cover is correctly re-fitted before
normal operation commences.
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Warrant y Policy
Comtech EF Data products are warranted against defects in material and workmanship
for a specific period from the date of shipment, and this period varies by product. In
most cases, the warranty period is two years. During the warranty period, Comtech EF
Data will, at its option, repair or replace products that prove to be defective. Repairs are
warranted for the remainder of the original warranty or a 90 day extended warranty,
whichever is longer. Contact Comtech EF Data for the warranty period specific to the
product purchased.
For equipment under warranty, the owner is responsible for freight to Comtech EF Data
and all related customs, taxes, tariffs, insurance, etc. Comtech EF Data is responsible for
the freight charges only for return of the equipment from the factory to the owner.
Comtech EF Data will return the equipment by the same method (i.e., Air, Express,
Surface) as the equipment was sent to Comtech EF Data.
All equipment returned for warranty repair must have a valid RMA number issued prior
to return and be marked clearly on the return packaging. Comtech EF Data strongly
recommends all equipment be returned in its original packaging.
Comtech EF Data Corporation’s obligations under this warranty are limited to repair or
replacement of failed parts, and the return shipment to the buyer of the repaired or
replaced parts.
Limitations of Warranty
The warranty does not apply to any part of a product that has been installed, altered,
repaired, or misused in any way that, in the opinion of Comtech EF Data Corporation,
would affect the reliability or detracts from the performance of any part of the product, or
is damaged as the result of use in a way or with equipment that had not been previously
approved by Comtech EF Data Corporation.
The warranty does not apply to any product or parts thereof where the serial number or the
serial number of any of its parts has been altered, defaced, or removed.
The warranty does not cover damage or loss incurred in transportation of the product.
The warranty does not cover replacement or repair necessitated by loss or damage from
any cause beyond the control of Comtech EF Data Corporation, such as lightning or other
natural and weather related events or wartime environments.
The warranty does not cover any labor involved in the removal and or reinstallation of
warranted equipment or parts on site, or any labor required to diagnose the necessity for
repair or replacement.
The warranty excludes any responsibility by Comtech EF Data Corporation for incidental
or consequential damages arising from the use of the equipment or products, or for any
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Preface MN/CDMQX.IOM
inability to use them either separate from or in combination with any other equipment or
products.
A fixed charge established for each product will be imposed for all equipment returned
for warranty repair where Comtech EF Data Corporation cannot identify the cause of the
reported failure.
Exclusive Remedies
Comtech EF Data Corporation’s warranty, as stated is in lieu of all other warranties,
expressed, implied, or statutory, including those of merchantability and fitness for a
particular purpose. The buyer shall pass on to any purchaser, lessee, or other user of
Comtech EF Data Corporation’s products, the aforementioned warranty, and shall
indemnify and hold harmless Comtech EF Data Corporation from any claims or liability
of such purchaser, lessee, or user based upon allegations that the buyer, its agents, or
employees have made additional warranties or representations as to product preference or
use.
The remedies provided herein are the buyer’s sole and exclusive remedies. Comtech EF
Data shall not be liable for any direct, indirect, special, incidental, or consequential
damages, whether based on contract, tort, or any other legal theory.
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Customer Support
Refer to p. xx in this Preface for information regarding this product’s Warranty Policy.
Contact the Comtech EF Data Customer Support Department for:
• Product support or training
• Reporting comments or suggestions concerning manuals
• Information on upgrading or returning a product
A Customer Support representative may be reached at:
Comtech EF Data
Attention: Customer Support Department
2114 West 7th Street
Tempe, Arizona 85281 USA
480.333.2200 (Main Comtech EF Data number)
480.333.4357 (Customer Support Desk)
480.333.2161 FAX
To return a Comtech EF Data product (in-warranty and out-of-warranty) for repair or
replacement:
• Contact the Comtech EF Data Customer Support Department. Be prep ared to supply the
Customer Support representative with the model number, serial number, and a description
of the problem.
• Request a Return Material Authorization (RMA) number from the Comtech EF Data
Customer Support representative.
• Pack the product in its original shippin g carton/packaging to ensure that th e product is not
damaged during shipping.
• Ship the product back to Comtech EF Data. (Shipping charges should be prepaid.)
Online Customer Support
An RMA number request can be requested electronically by contacting the Customer Support
Department through the online support page at www.comtechefdata.com/support.asp
• Click on “Service” for detailed instructions on our return procedures.
• Click on the “RMA Request Form” hyperlink, then fill out the form completely before
sending.
• Send e-mail to the Customer Support Department at service@comtechefdata.com.
:
xxii
1.1 Overview
The CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier® is a
modular multi-channel modem with redundancy contained in a single rack unit (1RU) chassis.
The CDM-Qx/QxL offers flexibility, redundancy, integration, and performance with four slots
configurable as modulators or demodulators. The CDM-Qx operates on the 70/140 MHz IF
frequency, while the CDM-QxL (Figure 1-1) is the L-Band (950
same modem.
The CDM-Qx/QxL supports DoubleTalk™ Carrier-in-Carrier
and receive (Rx) carriers in a full-duplex link to use the same transponder segment.
Chapter 1. INTRODUCTION
MHz – 1950MHz) version of the
®
option, allowing transmit (Tx)
Figure 1-1. CDM-Qx/QxL Multi-Channel Satellite Modem (CDM-QxL shown)
1.1.1 Standard and Optional Features
The CDM-Qx/QxL includes, but is not limited to, the following features:
®
• DoubleTalk™ Carrier-in-Carrier
the same transponder segment;
• CDM-Qx: 50 to 90 and 100 to 180 MHz frequency range;
• CDM-QxL: 950 MHz-1950 MHz L-band;
• 32 kbps to 20 Mbps;
• BPSK, QPSK, 8-PSK, 16-QAM operation;
• Flexible Configuration:
o 1 modem or 2 modems configured as 1:1
o Up to 4 demodulators
• Optional Built In Redundancy:
o 1:1 modem
allowing Tx and Rx carriers of a full-duplex link to use
1–1
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Introduction MN/CDMQx.IOM
o Up to 1:3 modulator
o Up to 1:3 demodulator
• EIA-422/-530, V.35, G.703 (T1/E1/E2) and HSSI Interfaces;
• 1 to 4 Ports of G.703 (E1 with D&I ) Quad E1 Interface Card;
• 10/100 BaseT Ethernet, RS-232 or RS-485 for M&C remote control;
• Forward Error Correction (FEC) choices included:
o Viterbi
o Viterbi with Reed-Solomon
o Trellis and Reed-Solomon
o Optional, 2
nd
Generation Turbo Product Coding (TPC) (IESS-315 compliant)
• Fully Accessible System Topology (FAST);
• Asymmetric Loop Timing;
• Common frequency reference for all modules;
• Optional High Stability Reference;
• Optional Redundant Power Supply;
• Individual or summed Modulator output power control;
• Interoperable with: CDM-550T, -570L, -600, -600L, SDM-300A, -300L3, and -8000
modems (in compatible modes);
• Drop and Insert, closed network version;
• Embedded Distant-end Monitor and Control (EDMAC) (see Note)
• Automatic Uplink Power Control (AUPC)
Refer to Sect. 1.3 for in-depth product information and Sect. 1.5 for the CDM-Qx/QxL Summary of
Specifications.
1.1.2 DoubleTalk™ Carrier-in-Carrier®
Designed for bandwidth compression, Carrier-in-Carrier® is based on Applied Signal
Technology’s DoubleTalk™ which uses “Adaptive Cancellation,” a patented (United States
Patent #6,859,641) technology that allows full duplex satellite links to transmit concurrently in
the same segment of transponder bandwidth. Available as an option to the modem, this added
dimension can result in a significant improvement in satellite transponder utilization.
1.1.3 Turbo Product Coding
The CDM-Qx/QxL offers optional 2nd generation Turbo Product Codec (TPC). TPC
simultaneously offers increased coding gain, lower decoding delay, and significant bandwidth
savings. The TPC provides:
• BPSK 5/16 and 21/44
• QPSK 21/44, 3/4, 7/8 and 17/18
• 8-PSK 3/4, 7/8, and 17/18
• 16QAM 3/4 and 7/8
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Introduction MN/CDMQx.IOM
1.2 Functional Description
The CDM-Qx/QxL Multi-Channel Satellite Modem has two fundamentally different types of
interface – IF and Data:
• The Data interface can be 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-direction al link with th e satellit e vi a th e upl ink and downlin k
equipment.
Transmit data is received by the terrestrial interface where line receivers convert the clock and
data signals to CMOS levels for further processing. A small FIFO follows the terrestrial interface
to facilitate the various clocking and framing options. If framing is enabled, the transmit clock
and data output from the FIFO pass through the framer, where the overhead EDMAC data is
added to the main data. Otherwise, the clock and data are passed directly to the Forward Error
Correction encoder.
In the FEC encoder, the data is scrambled, differentially encoded, and then convolutionally
encoded. Following the encoder, the data is fed to the transmit digital filters, which perform spectral
shaping on the data signals. The re sultant I and Q signals are th en fed to the BPSK/QPSK/8 -PSK/
16-QAM modulator. The carrier is generated by a frequency synthesizer, a nd the I and Q signals
directly modulate this carrier to produce an IF output signal.
The RX IF signal is translated and filt ered at an intermediate frequency (IF) u sing the coarse step
synthesizer. This is mixed with a second synthesizer, resulting in the signal being IF sampled with a
high-speed analog to digital converter (A to D). The sampled IF i s then digitally split into an Inphase (I) and a Quadrature (Q) component. An AGC circuit keeps the desi red signal level cons tant
over a broad range of input levels. The I and Q signals are then decimated to reduce the
computation rate into the poly phase matched filter.
Carrier and clock recovery is performed on the baseband I and Q signals after the matched filter.
The resultant demodulated signal is fed, in soft decision form, to the selected FEC decoder
(which can be Viterbi, TCM, Reed-Solomon, or Turbo if installed). After decoding, the recovered
clock and data pass to the de-framer (if EDMAC framing is enabled) where the overhead
information is removed. Following this, the data passes to the Plesiochronous/Doppler buffer,
which has a programmable size, or alternatively bypasses the buffer. From here, the receive clock
and data signals are routed to the terrestrial interface, and are passed to the externally connected
DTE equipment.
Physically, a modem chassis is comprised of three main card assemblies:
• The IF Backplan e car d includes the frequency reference, power splitters, power summers,
the FSK link (L-Band version only) and the IF Loop back functions.
• The Digital Backplane card routes all the con trol signals, data p ath switching, Carrier-in-
Carrier
®
signals and power for all modules.
• The M&C controls all functions in the unit.
Within the chassis are four slots which allow any combination of modulators or demodulators to be
installed. If configured as a single modem, two plug-in cards comprising a modulator and
demodulator are required.
• A Modulator card contains the transmit interface circuits, the framer, the encoder or
encoders and the signal processing functions of modulation.
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Introduction MN/CDMQx.IOM
• A Demodulator card performs all of the signal processing functions of carrier search,
cancellation, demodulation, Forward Error Correction, the de-framer, plesiochronous/
Doppler buffer and the receive interface circuits.
• Terrestrial data interface cards can be on the modulator cards or demodulator cards.
When a modulator and demodulator are grouped togeth er, the data interface card can be
used for full-duplex data interface. When one or up to four ports of E1 (with D&I) are
needed, the Quad E1 Data Interface Module can be installed in Slots 3 and 4.
Figure 1-2
shows a functional block diagram of the modem with either modulators and
demodulators in all four slots; and the figure also shows a modulator in Slot 1 and a demodulator in
Slot 2 along with a Quad E1 Data Interface Module in Slots 3 and 4.
Figure 1-2. CDM-Qx/QxL Open Network Satellite Modem Block Diagrams
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Introduction MN/CDMQx.IOM
1.3 Features
1.3.1 Physical Description
CDM-Qx/QxL Multi-Channel Sa tellite Modem is constructed as a 1RU-high rack-mounting chassis,
which can be free-standing if desired. Rack handles at the front facilitate removal from and placement
into a rack.
1.3.2 Compatibility
The CDM-Qx/QxL is backwards compatible with a number of Comtech EF Data CDM, SDM,
and
SLM modems.
1.3.3 Major Assemblies
CDM-Qx Major Assemblies
Assembly Description
PL/10570-1 1 PPM Reference IF Backplane 70/140 MHz IF
PL/10570-2 0.1 PPM Reference IF Backplane 70/140 MHz IF
PL/10069 Digital Backplane
PL/10073 Monitor and Control Card
PL/11128 70/140 MHz IF Modulator
PL/10635
PL/12960-1 AC Chassis, 70/140 IF
PL/12960-2 DC Chassis, 70/140 IF
Assembly Description
PL/10070-1 0.1 PPM Reference IF Backplane L-Band IF
PL/10069 Digital Backplane
PL/10073 Monitor and Control Card
PL/10071 L-Band IF Modulator
PL/10072
PL/12798-1 AC Chassis, L-Band
PL/12798-2 DC Chassis, L-Band
Assembly Description
AS/11014 Turbo Codec – Simplex
PL/10678 EIA-530 Duplex Data interface
PL/10697 G.703 Balanced Duplex Data Interface
PL/10698 G.703 Unbalanced Duplex Data Interface (E1/T1)
PL/10635 G.703 Unbalanced Duplex Data Interface (E2)
PL/12608-1 Quad E1 G.703 Data Interface
PL/10898-1 EIA-612/613 HSSI Interface
70/140 MHz IF Demodulator with Carrier in Carrier®
CDM-QxL Major Assemblies
L-Band IF Demodulator with Carrier in Carrier®
CDM Qx/QxL Optional Assemblies
1–5
CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier® Revision 7
Introduction MN/CDMQx.IOM
1.3.4 Dimensional Envelope
Figure 1-3. CDM-Qx/QxL Dimensional Envelope
1.3.5 Physical Features
1.3.5.1 Front Panel
Figure 1-4 shows the fro
front panel features (from left), a USB port; eight Light-Emitting-Diode (LED) indicators; a
keypad; and a Vacuum Fluorescent Display (VFD):
• The USB port is a slave connector used to reflash the unit’s firmware. For more
information, refer to Chapter 4. FLASH UPGRADING.
• The LEDs indicate, in a summary fashion, the status of the unit.
• The keypad comprises six individual keyswitches. They have a positive ‘click’ action,
which provides tactile feedback. The user enters data via the keypad, and messages are
displayed on the VFD.
Figure 1-4. Front Panel View (CDM-Qx shown)
nt panel of the CDM-Qx/QxL Open Network Satellite Modem. The
1–6
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