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CDM-840 Remote Router Revision 0
Introduction MN-CDM840
1–3
The CDM-840 supports reception and transmission of IP data over satellite links via two
fundamentally different types of interface – IF and data:
• The IF interface provides a bidirectional link with the satellite via the uplink and downlink
equipment.
• The data interface is a bidirectional path, which connects with the customer’s equipment
(assumed to be the DTE) and the unit (assumed to be the DCE). All terrestrial data is
connected using the available 10/100/1000 BaseT Ethernet interface.
The platform includes support for Constant Coding and Modulation (CCM) operation. CCM allows
operators to define groups of remotes that can have different modulation and coding parameters to
improve efficiency on existing satellite capacity.
On the transmit side: The return modulator transmits IP datagrams and is compatible with
Comtech EF Data’s CDD-880 Multi-Receiver Router(s) located at a hub site.
In the FEC encoder, the data is differentially encoded, scrambled, and then VersaFEC-encoded.
Following the encoder, the data is fed to the transmit digital filters, which perform spectral shaping
on the data signals. The resultant I and Q signals are then fed to the BPSK, QPSK, 8-QAM, or 16-
QAM modulator. The carrier is generated by a frequency synthesizer, and the I and Q signals
directly modulate this carrier to produce an IF output signal.
On the receive side: The DVB-S2 demodulator supports enhanced GSE decapsulation and label
filtering for up to 2,047 unique labels.
DVB-S2 Receiver: The CDM-840’s demodulator supports DVB-S2 QPSK, 8-PSK, 16-APSK and
32-APSK demodulation up to 62 Msps with receive data rates up to 167 Mbps depending on the
modulation type and code rate. In DVB-S2 operation, the receiver operates in the CCM mode. The
receiver automatically detects for spectral inversion and pilots ON/OFF, and supports spectral
rolloff of 20%, 25% or 35%.
- Remote Router 1
- Errata A 3
- CDM-840 5
- Table of Contents 7
- Table of Contents MN-CDM840 10
- Figures 11
- PREFACE 13
- Preface MN-CDM840 14
- Low Voltage Directive (LVD) 15
- Installation 15
- Environmental 15
- CE Mark 16
- RoHS Compliance 16
- Warranty Policy 17
- Limitations of Warranty 17
- Exclusive Remedies 18
- Customer Support 19
- Online Customer Support 19
- Chapter 1. INTRODUCTION 21
- 1.2 Functional Description 22
- Introduction MN-CDM840 23
- 1.3.3 Dimensional Envelope 25
- 1.3.4 Physical Features 26
- 1.3.4.1 Front Panel 26
- 1.3.4.2 Rear Panel 27
- 1.3.5 Data Interfaces 27
- 1.3.6 Verification 27
- FAST System Theory 28
- FAST Implementation 28
- FAST Accessible Options 28
- Hz range,100 Hz resolution 30
- 1.4.2 Regulatory Compliance 31
- Chapter 2. INSTALLATION 33
- 2.2 Mounting 34
- Installation MN-CDM840 35
- Chapter 3. REAR PANEL 37
- CONNECTOR 37
- PINOUTS 37
- 3.2 IF Connections 38
- 3.2.1 Rx IF Connector 38
- 3.2.2 Tx IF Connector 38
- 3.4 Utility Connections 40
- Chapter 4. FLASH UPGRADING 43
- Flash Upgrading MN-CDM840 44
- Chapter 5. ETHERNET 47
- MANAGEMENT 47
- 5.3 SNMP Interface 48
- 5.4.2 User Login 49
- 5.4.3 Web Server Menu Tree 50
- IMPORTANT 51
- 5.4.4.2 Home Pages 52
- 5.4.4.2.1 Home 52
- 5.4.4.2.2 Home 53
- 5.4.4.3 Admin Pages 54
- 5.4.4.3.1 Admin 54
- 5.4.4.3.2 Admin 55
- 5.4.4.3.3 Admin 56
- 5.4.4.3.4 Admin 57
- 5.4.4.4 Configuration Pages 58
- GE Interface 60
- Demodulator 61
- Modulator 63
- Add Static ARP 65
- Delete Static ARP 65
- Flush Dynamic ARPs 65
- ARP Table (Edit) 65
- Route Table (Edit) 67
- Add New Route 67
- Delete Route 67
- Receive WAN Labels 68
- , Max/Priority, or 71
- QoS Rules Table 72
- Add New QoS Rule 72
- Delete Rule 73
- LNB Control 75
- 5.4.4.5 Status pages 76
- Ethernet Statistics 77
- Mod Statistics 77
- Demod Statistics 77
- Clear Statistics 78
- Clear QoS Counters 80
- QoS Statistics 80
- System Monitor 81
- 5.4.4.6 Utility pages 82
- Save/Load Configuration 83
- (FUTURE) Redundancy 83
- BERT Config 83
- BERT Monitor 84
- System Reboot 84
- Chapter 6. FORWARD ERROR 85
- CORRECTION 85
- 6.2.1 Range of Data Rates 86
- 6.3 VersaFEC 86
- (Short-block LDPC) 86
- 6.3.1 Range of Data Rates 88
- Comtech VersaFEC® Codec 93
- Rate 0.488 BPSK 93
- Rate 0.533, 0.631, 0.706 94
- Rate 0.642, 0.711, 0.780 95
- Rate 0.731, 0.780, 0.829 96
- Appendix A. FAST ACTIVATION 97
- PROCEDURE 97
- A.2.2 Record Serial Number 98
- Appendix A MN-CDM840 100
- Appendix B. REMOTE CONTROL 101
- B.4 Packet Structure 102
- B.4.1 Start of Packet 102
- B.4.2 Target Address 103
- B.4.3 Address Delimiter 103
- B.4.4 Instruction Code 103
- B.4.7 End of Packet 104
- Appendix B MN-CDM840 105
- B–5 105
- B–6 106
- B–7 107
- B–8 108
- METRIC CONVERSIONS 109
- Units of Length 109
- Temperature Conversions 109
- Units of Weight 109
- 480 • 333 • 2200 PHONE 110
- • 333 • 2161 FAX 110
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