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3-8
Cisco uBR10012 Universal Broadband Router Software Configuration Guide
OL-1520-05
Chapter3 Configuring Cable Interface Features for the CiscouBR10012Router
Configuring the Downstream Cable Interface
Verifying the Downstream Interleave Depth
To verify the downstream interleave depth setting, enter the show controllers cable command for the
downstream port you have just configured:
Router# show controllers cable5/0/0 downstream
Cable5/0/0 Downstream is up
Frequency=96000000, Channel Width 6 MHz, 64-QAM, Symbol Rate 5.056941 Msps
FEC ITU-T J.83 Annex B, R/S Interleave I=32, J=
Perform these steps if you are having difficulty with verification:
Step1 Ensure that the cable connections are not loose or disconnected.
Step2 Ensure that the cable interface line card is firmly seated in its chassis slot.
Step3 Ensure that the captive installation screws are tight.
Step4 Verify that you have entered the correct slot and port numbers.
Step5 Verify that the downstream carrier is active, using the cable downstream if-output command.
Setting the Downstream Modulation
To set the downstream modulation, define the speed in symbols per second at which data travels
downstream to the subscriber’s CM. Asymbol is the basic unit of modulation. Quadrature Phase Shift
Key (QPSK) encodes 2 bits per symbol, Quadrature Amplitude Modulation (QAM) -16 encodes 4 bits
per symbol, QAM-64 encodes 6 bits per symbol, and QAM-256 encodes 8 bits per symbol.
Note Setting a downstream modulation rate of QAM-256 requires approximately a 6dB higher
signal-to-noise ratio (SNR) than QAM-64 at the subscriber’s cableinterface. If your network is
marginal or unreliable at QAM-256, use the QAM-64 format instead. Also, consider the significance
of your data.
To set the downstream modulation, use the following command in cable interface configuration mode.
The standard DOCSIS modulation rate (and the Cisco default) is QAM-64.
Router(config-if)# cable downstream modulation 64qam
Verifying the Downstream Modulation
To verify the downstream modulation setting, enter the show controllers cable command for the
downstream port you have just configured. See the following example:
Router# show controllers cable5/0/0 downstream
Cable5/0/0 Downstream is up
Frequency=96000000, Channel Width 6 MHz, 64-QAM, Symbol Rate 5.056941 Msps
FEC ITU-T J.83 Annex B, R/S Interleave I=32, J=4
Perform these steps if you are having difficulty with verification:
- Text Part Number: OL-1520-08 1
- CONTENTS 3
- Contents 4
- Document Revision History 9
- Audience 10
- Document Organization 10
- Conventions 11
- Terms and Acronyms 12
- OL-1520-06 13
- Additional References 14
- Standards 15
- Obtaining Documentation 16
- Ordering Documentation 17
- Documentation Feedback 17
- Cisco.com 17
- Technical Assistance Center 18
- Cisco TAC Escalation Center 19
- Broadband Router Software 21
- Operational Overview 22
- Cisco IOS Software Location 22
- DOCSIS 1.1 Feature Support 31
- High Availability Features 31
- Intercept Features 32
- IP Routing Features 32
- Management Features 32
- AutoInstall 35
- Cisco Network Registrar 35
- Extended Setup Facility 35
- Integrated DHCP Server 37
- DOCSIS 1.0 Feature Support 38
- DOCSIS 1.0 MAC Driver 40
- DOCSIS 1.0 Multi SID Support 42
- DOCSIS 1.0 ToS Overwrite 44
- DOCSIS 1.0+ Feature Support 47
- Additional Information 48
- DOCSIS 1.1 CM Compatibility 50
- Commands 51
- DOCSIS 1.1 MAC Scheduler 53
- Basic Wiretap Support 67
- Cable Monitor Enhancements 67
- Additional COPS Information 71
- Packet Intercept 73
- PXF ARP Filter 73
- PXF Divert Rate Limiting 73
- IP Broadcast Echo 75
- IP Multicast Echo 75
- SSM Mapping 76
- • Cable ARP Filtering 78
- Integrated Time-of-Day Server 79
- Cable Interface Bundling 82
- CNEM Compliance 82
- Broadband Internet Access 82
- DOCSIS 2.0 SAMIS ECR Data Set 83
- Changes from Cisco DSG 1.0 84
- Prerequisites for DSG 1.1 85
- Downstream Frequency Override 86
- Dynamic Modulation Profiles 87
- Dynamic Upstream Modulation 88
- CISCO-CABLE-METERING-MIB 89
- CISCO-CABLE-QOS-MONITOR MIB 90
- CISCO-CABLE-SPECTRUM-MIB 90
- CISCO-ENHANCED-MEMPOOL-MIB 91
- CISCO-PROCESS-MIB 91
- DOCS-QOS-MIB 91
- DSG-IF-MIB 91
- Restrictions 92
- • debug cable range 94
- Spectrum Management 96
- Statistical Counters 97
- Usage Based Billing (SAMIS) 98
- PacketCable 1.0 With CALEA 99
- OL-1520-08 104
- Security Features 105
- Address Verification 106
- CM Transmission Burst Size 106
- Dynamic Ranging 108
- Flap List Support 109
- Virtual Interfaces 110
- VLAN Features 112
- IPv6 over L2VPN 113
- MPLS-VPN Network Support 113
- • TLS for the Cisco CMTS 117
- System for the First Time 119
- Preparing for Configuration 120
- Fundamentals 121
- OL-1520-05 122
- Configuring Global Parameters 126
- Configuration Mode 131
- MAC-Layer Addressing 132
- Identifying CM Line Cards 133
- CiscouBR10012Router 137
- Verifying ARP Requests 140
- Activating Downstream Ports 141
- Activating the Upstream Ports 150
- Verifying the Upstream Ports 151
- Troubleshooting Tips 161
- no cable proxy-arp 163
- Setting IP Multicast Echo 164
- Verifying IP Multicast Echo 164
- Setting IP Broadcast Echo 165
- Verifying IP Broadcast Echo 165
- Fiber-Coaxial Network 175
- Activating CM Authentication 176
- Verify CM Authentication 177
- Clearing CM Counters 179
- Clearing CM Reset 180
- Configuring Per-Modem Filters 183
- Troubleshooting the System 193
- : 1624 197
- Configuring PRBS Test Signals 207
- Verifying Test Signal Output 207
- Pinging Unresponsive CMs 208
- DOCSIS Specification Summary 213
- • Regional processing centers 214
- • Headends 214
- CMTS Traffic Engineering 217
- Configuration Bit Meanings 221
- Bits 0–3 222
- Bit 10 and Bit 14 224
- Bit 11 and Bit 12 224
- OL-1520-04 229
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