Cisco uBR10-SRP-OC12SML Specifications Page 217
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Cisco uBR10012 Universal Broadband Router Software Configuration Guide
OL-1520-05
AppendixA DOCSIS and CMTS Architectural Overview
CMTS Traffic Engineering
Upstream signals are demodulated using Quadrature Phase Shift Keying (QPSK) or quadrature
amplitude modulation (QAM). QPSK carries information in the phase of the signal carrier, whereas
QAM uses both phase and amplitude to carry information.
Tip If your cable plant is susceptible to ingress or noise, Cisco recommends QPSK, based on the
importance of the data. Frequencies below 20MHz are more susceptible to noise and might require
lower symbol rates. Higher frequencies might be able to support higher rates and use QAM
modulation instead.
Overview of DOCSIS Two-Way Server Requirements
A TFTP server, DHCP server, and ToD server are required to support DOCSIS1.0-based CMs on the
network. A DOCSIS 1.0-based CM does not boot if these servers are not available.
Log server and security servers are not required to configure and operate a CM. If the log server or
security servers are not present, a CM generates warning messages, but continues to boot and function
properly.
ToD and TFTP servers are standard Internet implementations of the RFC 868 and RFC 1350
specifications. Most computers running a UNIX-based operating system, supply ToD and TFTP servers
as a standard software feature. Typically, the ToD server is embedded in the UNIX inetd and requires
no additional configuration. The TFTP server is usually disabled in the standard software, but can be
enabled by modifying the inetd.conf file. Microsoft NT server software includes a TFTP server that can
be enabled with the services control panel. Microsoft NT does not include a ToD server. A public domain
version of the ToD server for Microsoft NT can be downloaded from several sites. For configuration
information, refer to Chapter3, “Configuring Cable Interface Features for the CiscouBR10012Router.”
CMTS Traffic Engineering
Sending data reliably upstream is a critical issue. Designing a robust upstream architecture requires
balancing system parameters, establishing subscriber data requirements, and configuring the network to
support those requirements.
Upstream spectrum varies greatly between cable plants. Maintaining stable return paths also differs
based on varying patterns and levels of ingress noise and interference. Common problems in cable plants
include:
• Electrical and magnetic interference (EMI)
• Thermal noise
• Carrier to noise (C/N) imbalances
• Interference of leaking signals
• Ingress due to other channels appearing at the desired channel frequency
• Distortion due to non-linearities of cable equipment
• Cross modulation—carrier to frequency distortion
• Hum and low frequency distortion
• Improper RF amplifier tuning
• Non-unity gains due to incorrect usage of attenuators
• Low-quality subscriber equipment
• Out of range signal power from the CMTS to the CM
- 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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