Comtec CDM-840

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Comtech EF Data, 2114 West 7th Street, Tempe, Arizona 85281 USA, 480.333.2200, FAX: 480.333.2161

CDM-840

Advanced VSAT Series CDM-840 Remote Router)

Installation and Operation Manual

For Firmware Version 1.6.2.X or Higher

Part Number MN-CDM840 / CD-CDM840

Revision 3

Main Page

Default Chapter8
- Table of Contents8
- Figure 1-1. CDM-840 Remote Router33
- Figure 1-2. Advanced VSAT Series Network Topology Example33
Features36
- Physical Description36
  - Standard Assemblies36
  - Optional Assemblies36
- Dimensional Envelope37
- Figure 1-3. CDM-840 Dimensional Envelope37
- Physical Features38
- On-Site Firmware Updates41
- On-Site Operational Upgrades41
- Monitor and Control Interfaces41
Specifications42
- Product Features42
- Physical, Power, and Environmental42
- Modulator43
  - Transmit43
  - Block up Converter (BUC) Support44
- Demodulator44
  - Receive44
  - Low Noise Block down Converter (LNB) Support45
- BER (Bit Error Rate)46
  - BER Monitor Functions46
- Regulatory Compliance46
Chapter 2. Installation47
Unpack and Inspect the Shipment47
- Figure 2-1. Unpack and Inspect the Shipment47
Install the Unit into a Rack Enclosure48
- 2.2.1 Install the Optional Rear Support Brackets Kit49
- Figure 2-2. Install the Unit into a Rack Enclosure49
- Figure 2-3. Install the Optional Rear Support Brackets Kit50
Chapter 3. Rear Panel Connections53
Overview - Cabling Connection Types53
- Figure 3-1. Coaxial Connector Examples54
- Figure 3-2. D-Subminiature Connector Examples56
Cabling Connections57
- Table 3-1. CDM-840 Rear Panel Connectors57
CDM-840 Ground and Power Connections63
- Common Chassis Ground Interface63
- Figure 3-4. Chassis Ground Interface63
- 230V Alternating Current (AC) Power Interface (Standard)64
- 48V Direct Current (DC) Power Interface (Optional)66
Chapter 4. Updating Firmware69
Firmware Update Overview69
Getting Started: Prepare for the Firmware Download70
Download and Extract the Firmware Update74
Perform the Ethernet FTP Upload Procedure76
Chapter 5. Fast Activation Procedure79
FAST Overview79
FAST Activation Via the HTTP Interface80
- Figure 5-1. CDM-840 HTTP Interface - 'Admin | FAST' Page80
  - 5.2.1 FAST Configuration81
  - 5.2.2 FAST Upgrade82
Chapter 6. Ethernet-Based Remote Product Management83
Overview83
Ethernet Management Interface Protocols84
- 6.2.1 Ethernet Management Interface Access84
- Figure 6-1. CDM-840 Serial Interface84
- 6.2.2 SNMP Interface85
  - Management Information Base (MIB) Files85
  - SNMP Community Strings86
- 6.2.3 HTTP (Web Server) Interface86
HTTP Interface92
- Home92
- Admin (Administration)94
- Configuration101
- Status148
  - Status | Statistics148
  - Status | Monitor160
    - Status | Monitor | Events160
    - Status | Monitor | Alarms161
- Utility163
Chapter 7. Serial-Based Remote Product Management169
Overview169
Remote Commands and Queries Overview171
- Basic Protocol171
- Packet Structure172
Remote Commands and Queries177
- Transmit (Tx) Parameters Commands and Queries180
- Receive (Rx) Parameters Commands and Queries182
- Demodulator Status Commands and Queries184
- Transmit (Tx) BERT Command or Query185
- Receive (Rx) BERT Command or Query185
- BUC (Block up Converter) Parameters Commands and Queries185
- LNB (Low-Noise Block down Converter) Parameters Commands and Queries189
- Unit Parameters Commands and Queries190
- Bulk Configuration String Commands197
- Redundancy Commands and Queries198
- Vipersat Management System (VMS) Commands and Queries199
- Entry Channel Mode (ECM) Commands and Queries200
- Miscellaneous Utility Commands and Queries201
Appendix A. Reference Documentation203
Overview203
FEC (Forward Error Correction) Options204
ACM/VCM (Adaptive Coding and Modulation / Variable Coding and Modulation) Operation205
BPM (Bridge Point-To-Multipoint) Operation206
ECM (Entry Channel Mode) Operation207
Dmesh (VMS Dynamic Mesh) Connectivity208
DPC (VMS Dynamic Power Control) Operation209
Appendix B. Fec (Forward Error Correction) Options211
FEC Overview211
DVB-S2: LDPC and BCH211
- Range of Data Rates212
- BER, QEF, Eb/No, Es/No Spectral Efficiency, and Occupied Bandwidth212
Versafec (Short-Block LDPC213
- Range of Data Rates214
Rx/Tx Error Performance Characteristics214
- Table B-1. the Versafec Modcod Set214
Appendix C. Data Collection223
Data Collection Overview223
Initial Setup of Communications between the CDM-840 and the User PC225
Collect the Pre-Reboot Diagnostic Information from the CDM-840226
Collect and Report the Post-Reboot Diagnostic Information from the CDM-840227
Serial Adapter Cable Fabrication Specifications Reference229
Appendix D. Versafec Return Link Acm (Adaptive Coding and Modulation) Option231
Functional Overview231
- Background232
- Table D-1. the Versafec Modcod Set233
- Table D-2. Versafec Implementation of ACM - 100 Ksymbols/Sec Example Case234
Versafec ACM235
CDM-840 Versafec ACM Operation235
- Versafec ACM Operation Using the HTTP Interfaces235
- Troubleshooting238
- Monitoring ACM Performance238
- Modcod Switch Points238
ACM Congestion Control239
Notes and Recommendations240
Summary of Specifications241
Appendix E. Bpm (Bridge Point-To-Multipoint) Operation243
Functional Overview243
- BPM Terminology244
Supported Network Configurations245
- Flat Network245
- Flat Network with Routers245
- VLAN Trunking246
Packet Processing246
- Traffic Network / Ethernet Switch Behavior246
- Management Network247
IEEE 802.1Q Support248
- VLAN Trunking248
- Access Mode Support248
- Multiple VLAN Tagging Support249
Multicast BPM Behavior249
- Multicast Management/Routed Behavior (no Change250
BPM and Group Qos with Outbound ACM/VCM250
Hub Network Configuration251
Compatible Features and Detailed Specifications255
Summary256
Appendix F. Carrier ID (Dvb-CID Metacarrier257
Functional Overview257
- About Metacarrier257
- Functional Description258
CDM-840 Carrier ID Operation259
- CID Operation - CDM-840 HTTP Interface259
- CID Operation - Serial Remote Control262
Appendix G. Ecm (Entry Channel Mode265
Functional Overview265
- ECM Terminology265
- ECM Overview266
- ECM Message Processing269
ECM Operational Scenarios271
- Scenario 1 - VMS Initial Registration Process271
- Scenario 2 - Reverted or Auto-Recovered Messages271
  - G.2.2.1 ECM Revert Cycle Timing272
  - G.2.2.2 Ecmv2 Backoff Algorithm272
ECM Operation274
- ECM Operation - CDM-840 Serial Remote Control275
- ECM Operation - HTTP Interfaces276
  - G.3.2.1 CDM-840 HTTP Operation - Remote Router Terminals278
  - HTTP Operation - Hub Channel Controller (HCC281
    - Tap Message282
    - HCC Configuration283
Appendix H. Header and Payload Compression285
Functional Overview285
- Traffic Optimization286
- Compression Performance286
- Table H-1. Comtech AHA Gzip Performance Comparisons287
- Table H-2. Comtech AHA Gzip Performance Specifications Support287
CDM-840 Header and Payload Compression Operation288
- Enable or Disable Header and Payload Compression Operation290
- Configure Header and Payload Compression Refresh Rates291
- Table H-3. Compression Performance291
Appendix J. Return Group Qos (Quality of Service295
Overview295
- Qos List of Supported Rfcs (Requests for Comment295
- Qos Terminology295
- Return 2-Level Group Qos297
- Qos Operation Via Remote Product Control299
Qos Groups301
- Qos Group Matching301
- Maximum Clipping316
- Minimum Data Rate316
Qos Statistics Reporting319
Appendix K. Ran/Wan Optimization321
Overview321
- K.1.2 RAN Inefficiency322
E1 RAN Optimization323
- K.2.1 Process Overview324
Appendix L. Dmesh (Vms Dynamic Mesh) Solutions333
Overview333
Operational Features334
- VMS (Vipersat Management System334
- Return Link Versafec® ACM (Adaptive Coding and Modulation336
  - Versafec336
  - ACM (Adaptive Coding and Modulation336
    - ACM and Dmesh337
    - ACM and DPC (Dynamic Power Control337
Operational Example338
- Requirements for Bandwidth-On-Demand and Dmesh with SHOD (Single Hop on Demand338
- Dmesh Operation338
  - Create a Distribution List339
Summary343
- Table L-1. Comtech EF Data Product Compatibility Reference343
Compatibility343
Appendix M. Dpc (Vms Dynamic Power Control345
Overview345
- M.1.1 Background346
Theory of Operation346
- M.2.1 about DPC346
- M.2.2 DPC Functionality347
  - Entrance Link Cabling347
  - Operational Essentials348
- M.2.3 DPC Operational Considerations351
- M.2.4 Roaming with DPC360
DPC Operation361
- M.3.1 DPC Operation Using the HTTP Interfaces362
Firmware Update369
Final Considerations369

Comtec CDM-840 - Page 5

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