Comtec CDM-840 User manual

Part Number MN-CDM840 / CD-CDM840 Revision 3
IMPORTANT NOTE: The information contained in this document supersedes all previously published
information regarding this product. Product specifications are subject to change without prior notice.
CD
M
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8
4
0
Advanced VSAT Series Remote Router
Installation and Operation Manual
For Firmware Version 1.6.2.X or higher

ER-CDM840-EA3 Rev - PLM C-0033932
Errata A for MN-CDM840 Rev 3
Comtech EF Data Documentation Update
Subject: Replace Sect. 3.2.3.3 'CONSOLE' Interface Connector (DB-9M)
Errata Part Number: ER-CDM840-EA3 Rev - (Errata documents are not revised)
PLM CO Number: C-0033932
Comments: Replace Sect. 3.2.3.3 (MN-CDM840 Rev 3 Page 3-9):

ER-CDM840-EA3 Rev - PLM C-0033932
BLANK PAGE

Copyright © 2015 Comtech EF Data. All rights reserved. Printed in the USA.
Comtech EF Data, 2114 West 7th Street, Tempe, Arizona 85281 USA, 480.333.2200, FAX: [phone]
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

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iii
TABLE OF CONTENTS
TABLE OF CONTENTS ............................................................................................................III
TABLES .................................................................................................................................XIII
FIGURES................................................................................................................................XIII
PREFACE..............................................................................................................................XVII
About this Manual ......................................................................................................................... xvii
Related Documents................................................................................................................................xvii
Conventions and References ......................................................................................................... xviii
Patents and Trademarks .......................................................................................................................xviii
Warnings, Cautions, and Notes.............................................................................................................xviii
Examples of Multi-Hazard Notices........................................................................................................xviii
Recommended Standard Designations.................................................................................................xviii
Safety and Compliance.................................................................................................................... xix
Electrical Safety and Compliance............................................................................................................xix
Electrical Installation...............................................................................................................................xix
Operating Environment ..........................................................................................................................xix
European Union Radio Equipment and Telecommunications Terminal Equipment (R&TTE)
Directive (1999/5/EC) and EN 301 489-1 ..............................................................................................xx
European Union Electromagnetic Compatibility (EMC) Directive (2004/108/EC) .........................xx
European Union Low Voltage Directive (LVD) (2006/95/EC)...............................................................xx
European Union RoHS Directive (2002/95/EC)...................................................................................xxi
European Union Telecommunications Terminal Equipment Directive (91/263/EEC)........................xxi
CE Mark ...............................................................................................................................................xxi
Product Support.............................................................................................................................. xxi
Comtech EF Data Headquarters ....................................................................................................... xxi
Warranty Policy ............................................................................................................................. xxii
Limitations of Warranty .........................................................................................................................xxii
Exclusive Remedies ...............................................................................................................................xxiii
CHAPTER 1. INTRODUCTION............................................................................................1–1
1.1 Overview............................................................................................................................1–1
1.2 Functional Description ........................................................................................................1–2

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1.3 Features .............................................................................................................................1–4
1.3.1 Physical Description..................................................................................................................1–4
1.3.1.1 Standard Assemblies......................................................................................................... 1–4
1.3.1.2 Optional Assemblies.......................................................................................................... 1–4
1.3.2 Dimensional Envelope .............................................................................................................. 1–5
1.3.3 Physical Features ......................................................................................................................1–6
1.3.3.1 Front Panel Features......................................................................................................... 1–6
1.3.3.2 Rear Panel Features .......................................................................................................... 1–7
1.3.3.2.1 Rear Panel Standard Features.....................................................................................1–8
1.3.3.2.2 Rear Panel Optional Features .....................................................................................1–8
1.3.4 On-site Firmware Updates........................................................................................................1–9
1.3.5 On-site Operational Upgrades.................................................................................................. 1–9
1.3.6 Monitor and Control Interfaces................................................................................................ 1–9
1.4 Specifications....................................................................................................................1–10
1.4.1 Product Features ....................................................................................................................1–10
1.4.2 Physical, Power, and Environmental ...................................................................................... 1–10
1.4.3 Modulator...............................................................................................................................1–11
1.4.3.1 Transmit .......................................................................................................................... 1–11
1.4.3.2 Block Up Converter (BUC) Support .................................................................................1–12
1.4.4 Demodulator...........................................................................................................................1–12
1.4.4.1 Receive............................................................................................................................ 1–12
1.4.4.2 Low Noise Block Down Converter (LNB) Support ........................................................... 1–13
1.4.5 BER (Bit Error Rate)................................................................................................................. 1–14
1.4.5.1 BER Monitor Functions ................................................................................................... 1–14
1.4.6 Regulatory Compliance...........................................................................................................1–14
CHAPTER 2. INSTALLATION.............................................................................................2–1
2.1 Unpack and Inspect the Shipment .......................................................................................2–1
2.2 Install the Unit Into a Rack Enclosure...................................................................................2–2
2.2.1 Install the Optional Rear Support Brackets Kit.........................................................................
2–3
CHAPTER 3. REAR PANEL CONNECTIONS.....................................................................3–1
3.1 Overview – Cabling Connection Types .................................................................................3–1
3.2 CDM-840 Cabling Connections.............................................................................................3–5
3.2.1 IF Connector Group .................................................................................................................. 3–6
3.2.1.1 ‘L-BAND Rx’ IF Connector.................................................................................................. 3–6
3.2.1.2 ‘L-BAND Tx’ IF Connector.................................................................................................. 3–6
3.2.2 Terrestrial Data Connector Group ............................................................................................ 3–7
3.2.2.1 ‘G.703 | OUT / IN’ Connectors..........................................................................................3–7
3.2.2.2 ‘ETHERNET | TRAFFIC | GE’ (Gigabit Ethernet) Connector (RJ-45F) .................................3–7
3.2.3 Utility Connector Group ...........................................................................................................3–8
3.2.3.1 ‘ETHERNET | MANAGEMENT | FE’ (Fast Ethernet) Connector (RJ-45F)........................... 3–8

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3.2.3.2 ‘REDUNDANCY’ Interface Connector (DB-9F) (FUTURE)...................................................3–8
3.2.3.3 ‘CONSOLE’ Interface Connector (DB-9M) ......................................................................... 3–9
3.2.3.4 ‘ALARMS’ Interface Connector (DB-15M).......................................................................3–10
3.3 CDM-840 Ground and Power Connections .........................................................................3–11
3.3.1 Common Chassis Ground Interface ........................................................................................ 3–11
3.3.2 115V/230V Alternating Current (AC) Power Interface (Standard) .........................................3–12
3.3.2.1 AC Operation – Apply Power .......................................................................................... 3–12
3.3.2.2 AC Operation – Replace the Fuses .................................................................................3–13
3.3.3 -48V Direct Current (DC) Power Interface (Optional)............................................................. 3–14
3.3.3.1 DC Operation – Apply Power .......................................................................................... 3–14
3.3.3.2 DC Operation – Replace the Fuses..................................................................................3–15
CHAPTER 4. UPDATING FIRMWARE................................................................................4–1
4.1 Firmware Update Overview ................................................................................................4–1
4.2 Getting Started: Prepare for the Firmware Download ..........................................................4–2
4.3 Download and Extract the Firmware Update .......................................................................4–6
4.4 Perform the Ethernet FTP Upload Procedure .......................................................................4–8
CHAPTER 5. FAST ACTIVATION PROCEDURE................................................................5–1
5.1 FAST Overview....................................................................................................................5–1
5.2 FAST Activation via the HTTP Interface ................................................................................5–2
5.2.1 FAST Configuration ................................................................................................................... 5–3
5.2.2 FAST Upgrade ...........................................................................................................................5–4
CHAPTER 6. ETHERNET-BASED REMOTE PRODUCT MANAGEMENT.........................6–1
6.1 Overview............................................................................................................................6–1
6.2 Ethernet Management Interface Protocols ..........................................................................6–2
6.2.1 Ethernet Management Interface Access ..................................................................................6–2
6.2.2 SNMP Interface.........................................................................................................................6–3
6.2.2.1 Management Information Base (MIB) Files ......................................................................6–3
6.2.2.2 SNMP Community Strings .................................................................................................6–4
6.2.3 HTTP (Web Server) Interface ....................................................................................................6–4
6.2.3.1 User Login ......................................................................................................................... 6–4
6.2.3.2 HTTP Interface – Operational Features.............................................................................6–5
6.2.3.2.1 Virtual Front Panel ...................................................................................................... 6–5
6.2.3.2.1.1 Virtual Front Panel LEDs ...................................................................................... 6–6
6.2.3.2.2 Navigation................................................................................................................... 6–7
6.2.3.2.3 Page Sections ..............................................................................................................6–8

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6.2.3.2.4 Action Buttons ............................................................................................................ 6–8
6.2.3.2.5 Drop-down Lists .......................................................................................................... 6–8
6.2.3.2.6 Text or Data Entry....................................................................................................... 6–8
6.2.3.3 HTTP Interface Menu Tree Diagram ................................................................................. 6–9
6.3 HTTP Interface Page Descriptions ......................................................................................6–10
6.3.1 Home Pages ............................................................................................................................ 6–10
6.3.1.1 Home | Home .................................................................................................................6–10
6.3.1.2 Home | Contact............................................................................................................... 6–11
6.3.2 Admin (Administration) Pages................................................................................................6–12
6.3.2.1 Admin | Access................................................................................................................6–12
6.3.2.2 Admin | SNMP ................................................................................................................ 6–13
6.3.2.3 Admin | FAST ..................................................................................................................6–14
6.3.2.4 Admin | Firmware...........................................................................................................6–15
6.3.2.5 Admin | Auto Logout ......................................................................................................6–16
6.3.2.6 Admin | VMS................................................................................................................... 6–17
6.3.3 Configuration Pages................................................................................................................ 6–19
6.3.3.1 Configuration | Interface Pages......................................................................................6–19
6.3.3.1.1 Configuration | Interface | Fe Mgt........................................................................... 6–19
6.3.3.1.2 Configuration | Interface | GE..................................................................................6–20
6.3.3.1.3 Configuration | Interface | E1 Pages ........................................................................6–22
6.3.3.1.3.1 Configuration | Interface | E1 | Configuration..................................................6–22
6.3.3.1.3.2 Configuration | Interface | E1 | Time Slots ....................................................... 6–24
6.3.3.2 Configuration | WAN pages ............................................................................................6–25
6.3.3.2.1 Configuration | WAN | Demod Pages ......................................................................6–25
6.3.3.2.1.1 Configuration | WAN | Demod | Config............................................................ 6–25
6.3.3.2.1.2 Configuration | WAN | Demod | ACM (Adaptive Coding and Modulation) ..... 6–30
6.3.3.2.2 Configuration | WAN | Mod (Modulator) Pages...................................................... 6–32
6.3.3.2.2.1 Configuration | WAN | Mod | Config................................................................6–32
6.3.3.2.2.2 Configuration | WAN | Mod | ACM .................................................................. 6–36
6.3.3.2.2.3 Configuration | WAN | Mod | DPC....................................................................6–38
6.3.3.2.3 Configuration | WAN | QoS (Quality of Service) ......................................................6–40
6.3.3.2.3.1 Page Functionality Common for all QoS Control Modes ................................... 6–41
6.3.3.2.3.2 Page Functionality Specific to Active QoS Mode ............................................... 6–44
6.3.3.2.4 Configuration | WAN | Label.................................................................................... 6–48
6.3.3.2.5 Configuration | WAN | Compression ....................................................................... 6–49
6.3.3.2.6 Configuration | WAN | BUC (Block Up Converter)................................................... 6–50
6.3.3.2.7 Configuration | WAN | LNB (Low Noise Block Down Converter) ............................. 6–52
6.3.3.3 Configuration | Network Pages ...................................................................................... 6–53
6.3.3.3.1 Configuration | Network | Routing Pages ................................................................6–53
6.3.3.3.1.1 Configuration | Network | Routing | Routes ....................................................6–53
6.3.3.3.1.2 Configuration | Network | Routing | IGMP.......................................................6–55
6.3.3.3.1.3 Configuration | Network | Routing | DHCP.......................................................6–57
6.3.3.3.2 Configuration | Network | ARP ................................................................................ 6–58
6.3.3.3.3 Configuration | Network | Working Mode............................................................... 6–59
6.3.3.3.4 Configuration | Network | DNS ................................................................................6–60
6.3.3.4 Configuration | ECM (Entry Channel Mode)................................................................... 6–61

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6.3.3.5 Configuration | dSCPC (Dynamic Single Carrier per Channel) ........................................ 6–64
6.3.4 Status Pages............................................................................................................................ 6–66
6.3.4.1 Status | Statistics Pages ..................................................................................................6–66
6.3.4.1.1 Status | Statistics | Traffic ........................................................................................6–66
6.3.4.1.2 Status | Statistics | Network / Router ......................................................................6–68
6.3.4.1.3 Status | Statistics | Compression.............................................................................. 6–69
6.3.4.1.4 Status | Statistics | QoS ............................................................................................ 6–70
6.3.4.1.4.1 Page Functionality Common for all QoS Control Modes ................................... 6–71
6.3.4.1.4.2 Page Functionality Specific to Active QoS Control Mode ..................................6–72
6.3.4.1.5 Status | Statistics | E1 Pages (CDM-840 only) .......................................................... 6–73
6.3.4.1.5.1 Status | Statistics | E1 | Transmit......................................................................6–73
6.3.4.1.5.2 Status | Statistics | E1 | Receive........................................................................ 6–74
6.3.4.1.6 Status | Statistics | Trending (CDM-840 only).......................................................... 6–76
6.3.4.2 Status | Monitor Pages ................................................................................................... 6–78
6.3.4.2.1 Status | Monitor | Events .........................................................................................6–78
6.3.4.2.2 Status | Monitor | Alarms ........................................................................................ 6–79
6.3.5 Utility Pages ............................................................................................................................ 6–81
6.3.5.1 Utility | Utility ................................................................................................................. 6–81
6.3.5.2 Utility | Carrier ID............................................................................................................ 6–84
6.3.5.3 Utility | Reboot ............................................................................................................... 6–85
CHAPTER 7. SERIAL-BASED REMOTE PRODUCT MANAGEMENT ...............................7–1
7.1 Overview............................................................................................................................7–1
7.2 Remote Commands and Queries Overview ..........................................................................7–3
7.2.1 Basic Protocol ........................................................................................................................... 7–3
7.2.2 Packet Structure ....................................................................................................................... 7–4
7.2.2.1 Start of Packet...................................................................................................................7–5
7.2.2.2 Target Address ..................................................................................................................7–5
7.2.2.4 Instruction Code................................................................................................................ 7–5
7.2.2.5 Instruction Code Qualifier.................................................................................................7–5
7.2.2.5.1 Controller-to-Target Instruction Code Qualifiers ....................................................... 7–6
7.2.2.5.2 Target-to-Controller Instruction Code Qualifiers ....................................................... 7–6
7.2.2.6 Optional Message Arguments...........................................................................................7–7
7.2.2.7 End of Packet .................................................................................................................... 7–8
7.3 Remote Commands and Queries .........................................................................................7–9
7.3.1 Table Indexes............................................................................................................................ 7–9
7.3.2 Transmit (Tx) Parameters Commands and Queries................................................................ 7–12
7.3.3 Receive (Rx) Parameters Commands and Queries ................................................................. 7–14
7.3.4 Demodulator Status Commands and Queries........................................................................ 7–16
7.3.5 Transmit (Tx) BERT Command or Query................................................................................. 7–17
7.3.6 Receive (Rx) BERT Command or Query ..................................................................................7–17
7.3.7 BUC (Block Up Converter) Parameters Commands and Queries ...........................................7–17
7.3.8 LNB (Low-Noise Block Down Converter) Parameters Commands and Queries ..................... 7–21
7.3.9 Unit Parameters Commands and Queries ..............................................................................7–22

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7.3.10 Bulk Configuration String Commands..................................................................................... 7–29
7.3.11 Redundancy Commands and Queries .................................................................................... 7–30
7.3.12 Vipersat Management System (VMS) Commands and Queries............................................. 7–31
7.3.13 Entry Channel Mode (ECM) Commands and Queries.............................................................7–32
7.3.14 Miscellaneous Utility Commands and Queries....................................................................... 7–33
APPENDIX A. REFERENCE DOCUMENTATION ..............................................................A–1
A.1 Overview........................................................................................................................... A–1
A.2 FEC (Forward Error Correction) Options .............................................................................. A–2
A.3 ACM/VCM (Adaptive Coding and Modulation / Variable Coding and Modulation) Operation.....
.......................................................................................................................................... A–3
A.4 BPM (Bridge Point-to-Multipoint) Operation ...................................................................... A–4
A.5 ECM (Entry Channel Mode) Operation ................................................................................ A–5
A.6 dMesh (VMS Dynamic Mesh) Connectivity.......................................................................... A–6
A.7 DPC (VMS Dynamic Power Control) Operation.................................................................... A–7
APPENDIX B. FEC (FORWARD ERROR CORRECTION) OPTIONS ................................B–1
B.1 FEC Overview......................................................................................................................B–1
B.2 DVB-S2: LDPC and BCH ........................................................................................................B–1
B.2.1 Range of Data Rates..................................................................................................................B–2
B.2.2 BER, QEF, Eb/No, Es/No Spectral Efficiency, and Occupied Bandwidth ..........................................B–2
B.3 VersaFEC (Short-block LDPC)...............................................................................................B–3
B.3.1 Range of Data Rates..................................................................................................................B–4
B.4 CDM-840 Rx/Tx Error Performance Characteristics...............................................................B–4
APPENDIX C. DATA COLLECTION...................................................................................C–1
C.1 Data Collection Overview....................................................................................................C–1
C.2 Initial Setup of Communications Between the CDM-840 and the User PC .............................C–3
C.3 Collect the Pre-Reboot Diagnostic Information from the CDM-840 .......................................C–4
C.4 Collect and Report the Post-Reboot Diagnostic Information from the CDM-840....................C–5
C.5 Serial Adapter Cable Fabrication Specifications Reference....................................................C–7

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APPENDIX D. VERSAFEC RETURN LINK ACM (ADAPTIVE CODING AND MODULATION)
OPTION ....................................................................................................................D–1
D.1 Functional Overview .......................................................................................................... D–1
D.1.1 Background...............................................................................................................................D–2
D.2 VersaFEC ACM ................................................................................................................... D–3
D.2.1 VersaFEC ACM Latency .............................................................................................................D–4
D.3 CDM-840 VersaFEC ACM Operation .................................................................................... D–5
D.3.1 VersaFEC ACM Operation Using the HTTP Interfaces ..............................................................D–5
D.3.2 Troubleshooting........................................................................................................................D–8
D.3.3 Monitoring ACM Performance .................................................................................................D–8
D.3.4 ModCod Switch Points..............................................................................................................D–8
D.4 ACM Congestion Control .................................................................................................... D–9
D.5 Notes and Recommendations............................................................................................D–10
D.6 Summary of Specifications ................................................................................................D–11
APPENDIX E. BPM (BRIDGE POINT-TO-MULTIPOINT) OPERATION .............................E–1
E.1 Functional Overview ...........................................................................................................E–1
E.1.1 BPM Terminology ..................................................................................................................... E–2
E.2 Supported Network Configurations .....................................................................................E–3
E.2.1 Flat Network ............................................................................................................................. E–3
E.2.2 Flat Network with Routers........................................................................................................ E–3
E.2.3 VLAN Trunking .......................................................................................................................... E–4
E.3 Packet Processing ...............................................................................................................E–4
E.3.1 Traffic Network / Ethernet Switch Behavior............................................................................. E–4
E.3.2 Management Network ............................................................................................................. E–5
E.4 IEEE 802.1Q Support ...........................................................................................................E–6
E.4.1 VLAN Trunking .......................................................................................................................... E–6
E.4.2 Access Mode Support ............................................................................................................... E–6
E.4.3 Multiple VLAN Tagging Support................................................................................................ E–7
E.5 Multicast BPM Behavior......................................................................................................E–7
E.5.1 Multicast Management/Routed Behavior (No Change)........................................................... E–8
E.6 BPM and Group QoS with Outbound ACM/VCM ..................................................................E–8
E.7 Hub Network Configuration ................................................................................................E–9
E.8 Compatible Features and Detailed Specifications............................................................... E–13

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E.9 Summary .......................................................................................................................... E–14
APPENDIX F. CARRIER ID (DVB-CID METACARRIER®).................................................. F–1
F.1 Functional Overview ...........................................................................................................F–1
F.1.1 About MetaCarrier.................................................................................................................... F–1
F.1.2 Functional Description.............................................................................................................. F–2
F.2 CDM-840 Carrier ID Operation............................................................................................. F–3
F.2.1 CID Operation – CDM-840 HTTP Interface ............................................................................... F–3
F.2.2 CID Operation – Serial Remote Control.................................................................................... F–6
APPENDIX G. ECM (ENTRY CHANNEL MODE) ...............................................................G–1
G.1 Functional Overview .......................................................................................................... G–1
G.1.1 ECM Terminology .................................................................................................................... G–1
G.1.2 ECM Overview ......................................................................................................................... G–2
G.1.3 CDM-840 ECM Message Processing ........................................................................................ G–5
G.1.4 CDD-880 ECM Message Processing ......................................................................................... G–6
G.2 ECM Operational Scenarios ................................................................................................ G–7
G.2.1 Scenario 1 – VMS Initial Registration Process ......................................................................... G–7
G.2.2 Scenario 2 – Reverted or Auto-Recovered Messages.............................................................. G–7
G.2.2.1 ECM Revert Cycle Timing ................................................................................................. G–8
G.2.2.2 ECMv2 Backoff Algorithm ................................................................................................ G–8
G.3 ECM Operation ................................................................................................................ G–10
G.3.1 ECM Operation – CDM-840 Serial Remote Control............................................................... G–11
G.3.2 ECM Operation – HTTP Interfaces ......................................................................................... G–12
G.3.2.1 CDM-840 HTTP Operation – Remote Router Terminals ................................................ G–14
G.3.2.2 CDD-880 HTTP Operation – Hub Channel Controller (HCC)........................................... G–17
G.3.2.2.1 Tap Message............................................................................................................ G–19
G.3.2.2.2 HCC Configuration ................................................................................................... G–19
G.3.2.2.3 Hub Operation......................................................................................................... G–19
APPENDIX H. HEADER AND PAYLOAD COMPRESSION ...............................................H–1
H.1 Functional Overview .......................................................................................................... H–1
H.1.1 Traffic Optimization..................................................................................................................H–2
H.1.2 Compression Performance .......................................................................................................H–2
H.2 CDM-840 Header and Payload Compression Operation ....................................................... H–4
H.2.2 Enable or Disable Header and Payload Compression Operation .............................................H–6
H.2.3 Configure Header and Payload Compression Refresh Rates....................................................H–7
H.2.4 View Header and Payload Compression Statistics ...................................................................H–8

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APPENDIX J. RETURN GROUP QOS (QUALITY OF SERVICE) .......................................J–1
J.1 Overview............................................................................................................................ J–1
J.1.1 QoS List of Supported RFCs (Requests for Comment)...............................................................J–1
J.1.2 QoS Terminology .......................................................................................................................J–1
J.1.3 Return 2-Level Group QoS.........................................................................................................J–3
J.1.4 QoS Operation via Remote Product Control .............................................................................J–5
J.2 QoS Groups ........................................................................................................................ J–7
J.2.1 QoS Group Matching .................................................................................................................J–7
J.4.1 Maximum Clipping...................................................................................................................J–22
J.4.2 Minimum Data Rate.................................................................................................................J–22
J.5 QoS Statistics Reporting .....................................................................................................J–25
APPENDIX K. RAN/WAN OPTIMIZATION.........................................................................K–1
K.1 Overview............................................................................................................................K–1
K.1.1 Radio Access Network (RAN) ....................................................................................................K–1
K.1.2 RAN Inefficiency........................................................................................................................ K–2
K.2 E1 RAN Optimization...........................................................................................................K–3
K.2.1 Process Overview......................................................................................................................K–4
K.2.2 WAN Link Dimensioning and Pre-emptive Bandwidth Management ......................................K–5
K.2.2.1 Performance Monitoring via the CDM-840 HTTP Interface..............................................K–7
K.2.2.1.1 Traffic Throughput (kbps) Graph .............................................................................. K–10
K.2.2.1.2 RAN Link Quality Graph ............................................................................................K–10
K.2.2.1.3 RANOp Savings Graph...............................................................................................K–11
APPENDIX L. DMESH (VMS DYNAMIC MESH) SOLUTIONS........................................... L–1
L.1 Overview............................................................................................................................ L–1
L.2 Operational Features .......................................................................................................... L–2
L.2.1 VMS (Vipersat Management System)....................................................................................... L–2
L.2.2 Return Link VersaFEC® ACM (Adaptive Coding and Modulation) ............................................ L–4
L.2.2.1 VersaFEC® ......................................................................................................................... L–4
L.2.2.2 ACM (Adaptive Coding and Modulation) .......................................................................... L–4
L.2.2.2.1 ACM and dMesh.......................................................................................................... L–5
L.2.2.2.2 ACM and DPC (Dynamic Power Control)..................................................................... L–5
L.3 Operational Example .......................................................................................................... L–6
L.3.1 Requirements for Bandwidth-on-Demand and dMesh with SHOD (Single Hop on Demand) . L–6
L.3.2 dMesh Operation...................................................................................................................... L–6
L.3.2.1 Create a Distribution List................................................................................................... L–7
L.4 Compatibility .................................................................................................................... L–11

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L.5 Summary .......................................................................................................................... L–11
APPENDIX M. DPC (VMS DYNAMIC POWER CONTROL) ...............................................M–1
M.1 Overview.......................................................................................................................... M–1
M.1.1 Background..............................................................................................................................M–2
M.2 Theory of Operation.......................................................................................................... M–2
M.2.1 About DPC................................................................................................................................M–2
M.2.2 DPC Functionality.....................................................................................................................M–3
M.2.2.1 Entrance Link Cabling...................................................................................................M–3
M.2.2.2 Operational Essentials..................................................................................................M–4
M.2.2.2.1 Power Reference ......................................................................................................M–4
M.2.2.2.2 Reference Calibration...............................................................................................M–5
M.2.2.2.3 Rated Maximum Power............................................................................................M–5
M.2.2.2.4 Terminal Maximum Power .......................................................................................M–5
M.2.2.2.5 Target Power ............................................................................................................M–5
M.2.3 DPC Operational Considerations .............................................................................................M–7
M.2.3.1 Adaptive Control Loop (ACL) Components ..................................................................M–8
M.2.3.1.1 Closed Loop Mechanism...........................................................................................M–9
M.2.3.1.2 ACL Timers..............................................................................................................M–10
M.2.3.2 LQRM Failure and Recovery Steps .............................................................................M–11
M.2.3.3 DPC with ACM ............................................................................................................M–12
M.2.3.4 Terminal Maximum Power.........................................................................................M–13
M.2.3.5 DPC with ACM and Hub Backoff ................................................................................M–14
M.2.3.6 Hub Fade Control .......................................................................................................M–15
M.2.4 Roaming with DPC .................................................................................................................M–16
M.3 DPC Operation .................................................................................................................M–17
M.3.1 DPC Operation Using the HTTP Interfaces.............................................................................M–18
M.3.1.1 Configure DPC ............................................................................................................M–19
M.3.1.2 Power Reference in DPC Operation ...........................................................................M–20
M.3.1.2.1 Set Power Reference ..............................................................................................M–20
M.3.1.3 DPC – Status Reporting ..............................................................................................M–24
M.3.1.4 DPC – Operational Changes .......................................................................................M–24
M.4 Firmware Update.............................................................................................................M–25
M.5 Final Considerations.........................................................................................................M–25

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TABLES
Table 3-1. CDM-840 Rear Panel Connectors.............................................................................................3–5
Table 3-2. ‘REDUNDANCY’ Connector Pinouts......................................................................................... 3–8
Table 3-3. ‘CONSOLE’ Connector Pinouts ................................................................................................3–9
Table 3-4. ‘ALARMS’ Connector Pinouts ................................................................................................ 3–10
Table B-1. The VersaFEC ModCod Set.......................................................................................................B–4
Table D-1. The VersaFEC ModCod set.......................................................................................................D–3
Table D-2. VersaFEC Implementation of ACM – 100 ksymbols/sec Example Case ..................................D–4
Table H-1. Comtech AHA GZip Performance Comparisons ......................................................................H–3
Table H-2. Comtech AHA GZip Performance Specifications Support .......................................................H–3
Table H-3. Compression Performance ......................................................................................................H–7
Table L-1. Comtech EF Data Product Compatibility Reference............................................................... L–11
FIGURES
Figure 1-1. CDM-840 Remote Router ....................................................................................................... 1–1
Figure 1-2. Advanced VSAT Series Network Topology Example ...............................................................1–1
Figure 1-3. CDM-840 Dimensional Envelope ............................................................................................ 1–5
Figure 1-4. CDM-840 – Front Panel View.................................................................................................. 1–6
Figure 1-5. CDM-840 – Rear Panel View ...................................................................................................1–7
Figure 2-1. Unpack and Inspect the Shipment.......................................................................................... 2–1
Figure 2-2. Install the Unit Into a Rack Enclosure ..................................................................................... 2–3
Figure 2-3. Install the Optional Rear Support Brackets Kit .......................................................................2–4
Figure 3-1. Coaxial Connector Examples................................................................................................... 3–2
Figure 3-2. D-Subminiature Connector Examples.....................................................................................3–4
Figure 3-3. CDM-840 Cabling Connections ............................................................................................... 3–5
Figure 3-4. Chassis Ground Interface......................................................................................................3–11
Figure 3-5. AC Power Interface ............................................................................................................... 3–12
Figure 3-6. Apply AC Power to the Unit ..................................................................................................3–12
Figure 3-7. Replace the AC Fuses ............................................................................................................ 3–13
Figure 3-8. DC Power Interface...............................................................................................................3–14
Figure 3-9. Apply DC Power to the Unit..................................................................................................3–14
Figure 3-10. Replace the DC Fuses.......................................................................................................... 3–15
Figure 5-1. CDM-840 HTTP Interface – ‘Admin | FAST’ page ................................................................... 5–2
Figure 6-1. CDM-840 Serial Interface........................................................................................................ 6–2
Figure 6-2. CDM-840 Remote Router Virtual Front Panel ........................................................................6–5
Figure 6-3. CDM-840 HTTP Interface – Menu Tree (FW Ver. 1.6.2.5) ......................................................6–9
Figure 6-4. Home | Home Page .............................................................................................................. 6–10
Figure 6-5. Home | Contact Page............................................................................................................ 6–11
Figure 6-6. Admin | Access Page.............................................................................................................6–12
Figure 6-7. Admin | SNMP Page ............................................................................................................. 6–13
Figure 6-8. Admin | FAST Page ............................................................................................................... 6–14

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Figure 6-9. Admin | Firmware Page........................................................................................................ 6–15
Figure 6-10. Admin | Auto Logout Page ................................................................................................. 6–16
Figure 6-11. Admin | VMS Page.............................................................................................................. 6–17
Figure 6-12. Configuration | Interface | FE Mgt Page ............................................................................ 6–19
Figure 6-13. Configuration | Interface | GE page ................................................................................... 6–20
Figure 6-14. Configuration | Interface | E1 | Configuration Page.......................................................... 6–22
Figure 6-15. Configuration | Interface | E1 | Time Slots Page ............................................................... 6–24
Figure 6-16. Configuration | WAN | Demod | Config Page.................................................................... 6–25
Figure 6-17. Configuration | WAN | Demod | ACM Page ......................................................................6–30
Figure 6-18. Configuration | WAN | Mod | Config Page ........................................................................ 6–32
Figure 6-19. Configuration | WAN | Mod | ACM Page........................................................................... 6–36
Figure 6-20. Configuration | WAN | Mod | DPC Page............................................................................ 6–38
Figure 6-21. Configuration | WAN | QoS Page (QoS Control Mode = Off)............................................. 6–40
Figure 6-22. Configuration | WAN | Label Page ..................................................................................... 6–48
Figure 6-23. Configuration | WAN | Compression Page.........................................................................6–49
Figure 6-24. Configuration | WAN | BUC Page....................................................................................... 6–50
Figure 6-25. Configuration | WAN | LNB Page ....................................................................................... 6–52
Figure 6-26. Configuration | Network | Routing | Routes Page.............................................................6–53
Figure 6-27. Configuration | Network | Routing | IGMP Page...............................................................6–55
Figure 6-28. Configuration | Network | Routing | DHCP Page...............................................................6–57
Figure 6-29. Configuration | ARP Page ................................................................................................... 6–58
Figure 6-30. Configuration | Network | Working Mode Page................................................................6–59
Figure 6-31. Configuration | Network | DNS Page ................................................................................. 6–60
Figure 6-32. Configuration | ECM Page .................................................................................................. 6–61
Figure 6-33. Configuration | dSCPC Page ............................................................................................... 6–64
Figure 6-35. Status | Statistics | Traffic Page.......................................................................................... 6–66
Figure 6-36. Status | Statistics | Network | Router Page ....................................................................... 6–68
Figure 6-37. Status | Statistics | Compression Page............................................................................... 6–69
Figure 6-38. Status | Statistics | QoS Page ............................................................................................. 6–70
Figure 6-39. Status | Statistics | E1 | Transmit Page..............................................................................
6–73
Figure 6-40. Status | Statistics | E1 | Receive Page................................................................................ 6–74
Figure 6-41. Status | Statistics | Trending Page (Select Time Span = 20 minutes)................................. 6–76
Figure 6-42. Status | Monitor | Events Page .......................................................................................... 6–78
Figure 6-43. Status | Monitor | Alarms Page.......................................................................................... 6–79
Figure 6-44. Utility | Utility Page ............................................................................................................6–81
Figure 6-45. Utility | Carrier ID Page.......................................................................................................6–84
Figure 6-46. Utility | Reboot Page ..........................................................................................................6–85
Figure 7-1. CDM-840 Serial Interface Example ......................................................................................... 7–2
Figure A-1. Advanced VSAT Series Hub and Remote Site Products..........................................................A–1
Figure B-1. The VersaFEC Codes versus Shannon Capacity ......................................................................B–3
Figure B-2. DVB-S2 QPSK Packet Error Rate versus Es/No........................................................................B–5
Figure B-3. DVB-S2 8PSK Packet Error Rate versus Es/No ........................................................................B–6
Figure B-4. DVB-S2 16APSK Packet Error Rate versus Es/No....................................................................B–7
Figure B-5. DVB-S2 32APSK Packet Error Rate versus Es/No....................................................................B–8
Figure B-6. VersaFEC Codec – BPSK, Rate 0.488 .......................................................................................B–9
Figure B-7. VersaFEC Codec – QPSK, Rates 0.533, 0.631, 0.706 and 0.803............................................B–10
Figure B-8. VersaFEC Codec – 8-QAM, Rates 0.642, 0.711, and 0.780...................................................B–11

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Figure B-9. VersaFEC Codec – 16-QAM, Rates 0.731, 0.780, 0.829 and 0.853.......................................B–12
Figure D-1. VersaFEC Codes vs. Constrained Capacity..............................................................................D–4
Figure D-2. CDM-840 HTTP Interface and Menu Tree – VersaFEC ACM Operation (FW Ver. 1.6.2.X).....D–6
Figure D-3. CDM-840 HTTP Interface – Configuration | WAN | Mod | ACM Page ..................................D–7
Figure D-4. CDM-840 – ACM ModCod Switch Points................................................................................D–8
Figure D-5. CDM-840 – ACM Congestion Control.....................................................................................D–9
Figure E-1. Advanced VSAT BPM “Sky Ethernet Switch” .......................................................................... E–1
Figure E-2. Flat Network ........................................................................................................................... E–3
Figure E-3. Flat Network with Routers...................................................................................................... E–3
Figure E-4. BPM with VLANs ..................................................................................................................... E–4
Figure E-5. Management Network in BPM Mode..................................................................................... E–5
Figure E-6. Multicast Behavior in BPM Mode ........................................................................................... E–7
Figure E-7. Configuring VLAN to QoS Group Mapping (CTOG-250 shown) .............................................. E–8
Figure E-8. Hub Configuration – Standalone CTOG-250, No Redundancy.............................................. E–10
Figure E-9. Hub Network Configuration.................................................................................................. E–11
Figure E-10. Multiple CTOG-250 Outbounds in Redundant Mode ......................................................... E–12
Figure F-1. CDM-840 HTTP Interface and Menu Tree – Carrier ID Operation (FW Ver. 1.6.2.X).............. F–4
Figure F-2. Utility | Carrier ID Page........................................................................................................... F–5
Figure G-1. ECM – Message Processing Diagram..................................................................................... G–2
Figure G-2. ECM Message Processing – CDM-840 Remote Router ......................................................... G–5
Figure G-3. ECM Message Processing – CDD-880 Multi Receiver Router................................................ G–6
Figure G-4. HTTP Interfaces – Splash Pages and ECM Operation Menu Trees (FW Ver. 1.6.2.X).......... G–13
Figure G-5. CDM-840 HTTP Interface – Configuration | ECM Page....................................................... G–14
Figure G-6. CDD-880 HTTP Interface – Configuration | ECM Page........................................................ G–17
Figure H-1. HTTP Interface Menu Tree – Compression Operations (FW Ver. 1.6.2.X) .............................H–5
Figure H-2. Configuration | Network | Routing | Routes Page................................................................H–6
Figure H-3. Configuration | WAN | Compression Page ............................................................................H–7
Figure H-4. Configuration | WAN | MOD | ACM Page .............................................................................H–8
Figure H-5. Status | Statistics | Compression Page ..................................................................................H–8
Figure J-1. Group QoS Multi-tenant Site Return QoS ................................................................................J–3
Figure J-2. Group QoS for Multi-tenant Site 2-Level Return QoS Configuration .......................................J–4
Figure J-3. CDM-840 HTTP Interface and Menu Tree (FW Ver. 1.6.2.X)....................................................J–6
Figure J-4. Configuration | WAN | QoS Page Example (Control Mode = Off) ...........................................J–8
Figure J-5. CDM-840 HTTP Interface – Configuration | WAN | QoS Page Example (Control Mode =
DiffServ) ...........................................................................................................................................J–17
Figure J-6. Highly Degraded Remote Function – CDM-840 and CTOG-250 HTTP Interfaces...................J–24
Figure J-7. CDM-840 HTTP Interface – Status | Statistics | QoS Page Examples.....................................J–25
Figure K-1. 2G / 3G Radio Access Network (RAN).....................................................................................K–1
Figure K-2. Typical Abis Map.....................................................................................................................K–2
Figure K-3. RAN Optimization (GSM Abis Interface).................................................................................K–4
Figure K-4. Optimized Abis Traffic without Pre-emptive BW Management .............................................K–5
Figure K-5. Optimized Abis Traffic with Pre-emptive BW Management ..................................................K–6
Figure K-6. CDM-840 HTTP Interface and Menu Tree – Link Performance Monitoring (FW Ver. 1.6.2.X).....
.......................................................................................................................................................... K–8
Figure K-7. CDM-840 HTTP Interface – Status | Statistics | Trending Page..............................................K–9
Figure L-1. VMS Graphical User Interface (GUI)........................................................................................ L–2
Figure L-2. VMS-configured Advanced VSAT Network ............................................................................. L–3

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Figure L-3. CDD-880 HTTP Interface – Configuration | Network | Routing Page ..................................... L–9
Figure M-1. DPC Power Scale...................................................................................................................M–4
Figure M-2. ACM – ModCod Switch Points..............................................................................................M–6
Figure M-3. Closed Loop Mechanism ......................................................................................................M–9
Figure M-4. LQRM / Power Management Flow Diagram ......................................................................M–11
Figure M-5. DPC with ACM at Rate Max Power.....................................................................................M–12
Figure M-6. Hub Rain Fade.....................................................................................................................M–13
Figure M-7. DPC w/ACM with Hub Backoff ...........................................................................................M–14
Figure M-8. Roaming DPC ......................................................................................................................M–16
Figure M-9. HTTP Interfaces – Splash Pages and DPC Operation Menu Trees (FW Ver. 1.6.2.X) .........M–18