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CDM-840 Remote Router Revision 2
Appendix G MN-CDM840
G–3
G.2 E1 RAN Optimization
Jointly developed by Comtech EF Data, CEFD sister division Comtech AHA Corp., and CEFD
subsidiary Memotec Inc., RAN Optimization technology significantly reduces the Wide Area
Network (WAN) / satellite bandwidth required to carry an E1 bearer used for cellular backhaul.
RAN Optimization allows the transmit modem data rate to be reduced relative to the input
terrestrial data rate, thus allowing the transport of a user-selectable channel subset of bearer E1
using less bandwidth. In the receive direction, the data is restored to the E1 format for transport
over the G.703 E1 interface.
The process is designed to allow varying levels of optimization to accommodate the incoming
terrestrial data in the reduced modem data rate. Optimization performance depends on the
traffic profile and the difference between the terrestrial data rate (based on input timeslot
selection) and the transmit modem data rate. The optimization is performed in hardware for
optimal performance.
The user has complete control over the desired level of optimization by selecting the time slots
to be optimized, and the transmit modem data rate. Depending on the traffic profile, typical
bandwidth reduction of 30-35% can be achieved with little or no impact to the voice quality.
Users have the option to reduce WAN bandwidth by as much as 60% relative to the ingress data
rate – this allows the users to achieve desired bandwidth savings while maintaining desired
voice quality.
- MN-CDM840 Revision 2 1
- Errata A for MN-CDM840 Rev 2 3
- CDM-840 5
- TABLE OF CONTENTS 7
- Table of Contents MN-CDM840 10
- FIGURES 14
- PREFACE 17
- Safety and Compliance 18
- Electrical Installation 18
- Operating Environment 19
- (2004/108/EC) 19
- (91/263/EEC) 20
- CE Mark 21
- Product Support 21
- Comtech EF Data Headquarters 21
- Warranty Policy 22
- Limitations of Warranty 22
- Exclusive Remedies 23
- Preface MN-CDM840 24
- Chapter 1. INTRODUCTION 25
- Introduction MN-CDM840 26
- 1.3 CDM-840 Features 28
- 1.3.1 Physical Description 28
- 1.3.2 Dimensional Envelope 28
- 1.3.3.1 Front Panel 29
- 1.3.3.2 Rear Panel 30
- 1.4 CDM-840 Specifications 32
- 1.4.2 Bit Error Rate (BER) 33
- 1.4.3 Standard Assemblies 34
- 1.4.4 Optional Assemblies 34
- 1.4.5 Regulatory Compliance 34
- Chapter 2. INSTALLATION 35
- Installation MN-CDM840 36
- Chapter 3. REAR PANEL 41
- CONNECTIONS 41
- 3.1.1.1 Type ‘BNC’ 42
- 3.1.1.2 Type ‘TNC’ 42
- 3.1.1.3 Type ‘N’ 42
- 3.1.1.4 Type ‘F’ 43
- Chapter 4. UPDATING FIRMWARE 55
- • Local Echo = ON 56
- Updating Firmware MN-CDM840 57
- Chapter 5. FAST ACTIVATION 65
- PROCEDURE 65
- 5.2.1 FAST Configuration 67
- 5.2.2 FAST Upgrade 68
- Chapter 6. ETHERNET-BASED 69
- REMOTE PRODUCT 69
- 6.3 SNMP Interface 71
- 6.4.1 User Login 72
- 6.4.2.1 Virtual Front Panel 73
- 6.4.2.2 Navigation 75
- 6.4.2.3 Page Sections 75
- 6.4.2.4 Action Buttons 75
- 6.4.2.5 Drop-down Lists 76
- 6.4.2.6 Text or Data Entry 76
- 6.4.4.1 Home Pages 78
- 6.4.4.1.1 Home 78
- 6.4.4.1.2 Home 79
- 6.4.4.2.1 Admin 79
- 6.4.4.3 Admin 80
- 6.4.4.3.1 Admin 81
- 6.4.4.4 Admin 82
- Auto Logout Configuration 83
- 6.4.4.4.2 Admin 84
- 6.4.4.5 Configuration Pages 86
- FE – Management Interface 87
- VLAN Configuration 88
- E1 Configuration 90
- RAN Optimization 91
- E1 Port 91
- Time Slot Configuration 92
- Demodulator 94
- Demodulator Frequency 97
- Modulation) 98
- Rx ACM Configuration 99
- Rx ACM Status (read-only) 99
- Modulator Frequency 103
- Tx ACM Configuration 104
- Tx ACM Status (read-only) 105
- Tx ACM Events (read-only) 105
- (TOP) QoS Control Mode = OFF 106
- 6.4.4.5.2.3) 107
- QoS Rules Table (Edit) 109
- Receive WAN Labels 112
- Refresh Rates 113
- BUC Control 114
- BUC Status 115
- LNB Control 115
- LNB Status 116
- Add New Route 118
- Delete Route 118
- Route Table (Edit) 118
- IGMP Configuration 119
- IGMP Table 120
- DHCP Relay 121
- Add Static ARP 122
- Delete Static ARP 122
- Flush Dynamic ARPs 122
- ARP Table (Edit) 123
- Working Mode 123
- DNS Caching 124
- DNS Cache Flush 124
- ECM Remote Configuration 126
- Load Switching Configuration 128
- ToS Switching Configuration 129
- (ToS Rules Table) 129
- 6.4.4.6 Status Pages 130
- Ethernet Statistics 131
- Mod Statistics 131
- Demod Statistics 131
- Clear Statistics 132
- Clear Compression Counters 133
- Clear QoS Counters 135
- QoS Statistics 135
- E1 Transmit Statistics 137
- Clear E1 Receive Statistics 138
- E1 Receive Packet Statistics 138
- E1 Receive Statistics 139
- Traffic Throughput (kbps) 141
- RAN Link Quality 141
- RANOp Savings 141
- 6.4.4.6.2 Status 142
- 6.4.4.7 Utility Pages 143
- 6.4.4.7.1 Utility 143
- Save/Load Configuration 144
- BERT Config 145
- BERT Monitor 145
- Redundancy 145
- Console Configuration 145
- 6.4.4.7.2 Utility 146
- MANAGEMENT 147
- 7.2.1 Basic Protocol 149
- 7.2.2 Packet Structure 150
- 7.2.2.1 Start of Packet 150
- 7.2.2.2 Target Address 151
- 7.2.2.3 Address Delimiter 151
- 7.2.2.4 Instruction Code 151
- 7.2.2.7 End of Packet 153
- 7.3.1 Table Indexes 154
- Appendix A. REFERENCE 175
- DOCUMENTATION 175
- Appendix A MN-CDM840 176
- (ACM/VCM) 177
- A.4 E1 WAN/RAN Optimization 178
- Appendix B. FEC (FORWARD 181
- ERROR CORRECTION) OPTIONS 181
- B.2.1 Range of Data Rates 182
- B.3 VersaFEC 183
- (Short-block LDPC) 183
- B.3.1 Range of Data Rates 184
- Appendix B MN-CDM840 185
- Comtech VersaFEC® Codec 189
- Rate 0.488 BPSK 189
- Rate 0.533, 0.631, 0.706 190
- Rate 0.642, 0.711, 0.780 191
- Rate 0.731, 0.780, 0.829 192
- Appendix C. BRIDGE POINT-TO 193
- MULTIPOINT (BPM) OPERATION 193
- C.2.1 F lat Network 194
- C.2.3 VLAN Trunking 195
- C.3 Packet Processing 195
- C.3.2 Management Network 196
- C.4 IEEE 802.1Q Support 197
- C.4.1 VLAN Trunking 197
- C.4.2 Acces s Mode Support 197
- C.5 Multicast BPM Behavior 198
- Appendix C MN-CDM840 199
- C.9 Summary 205
- C.10 Glossary 206
- Appendix D. HEADER AND 207
- PAYLOAD COMPRESSION 207
- HTML 4.4:1 3.4:1 2.65:1 208
- Appendix D MN-CDM840 209
- Appendix E. DATA COLLECTION 213
- Appendix E MN-CDM840 214
- Appendix F. ENTRY CHANNEL 221
- MODE (ECM) 221
- Appendix F MN-CDM840 222
- F.2.3.1 Tap Message 227
- F.2.3.2 HCC Configuration 227
- F.2.3.3 Hub Operation 227
- F.4 Glossary of Terms 232
- Appendix G. WAN/RAN 233
- OPTIMIZATION 233
- G.1.2 RAN Inefficiency 234
- G.2 E1 RAN Optimization 235
- G.2.1 Process Overview 236
- Appendix G MN-CDM840 237
- G.2.3 Performance Monitoring 239
- G.2.3.2 RAN Link Quality 240
- G.2.3.3 RANOp Savings 241
- 480 • 333 • 2200 PHONE 244
- • 333 • 2161 FAX 244
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