Cisco Systems UBR10012 DOCSIS 1.0 Configuration File Settings, DOCSIS 1.0 Constant Bit Rate Extension, DOCSIS 1.0 MAC Driver, DOCSIS 1.0 Quality of Service Support

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Cisco uBR10012 Universal Broadband Router Software Configuration Guide

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Chapter1 Overview of CiscouBR10012 Universal Broadband Router Software

Supported Software Features for the CiscouBR10012 Router

DOCSIS 1.0 Configuration File Settings

Refer to these sections for additional information about DOCSIS configuration files:

•“DOCSIS 1.0 Constant Bit Rate Extension” section on page20

•“DOCSIS 1.0 Traffic Shaping and Rate Limiting Features” section on page23

•“DOCSIS 1.1 Subscriber Management” section on page37

For additional information about configuring DOCSIS QoS and other DOCSIS features, refer to the DOCSIS

1.1 Feature Module for the Cisco uBR7200 Routers on Cisco.com and to other documents cited below.

DOCSIS 1.0 Constant Bit Rate Extension

This DOCSIS 1.0 extension enables better processing of higher-priority traffic; fields in the DOCSIS

configuration file can be used so that when a CM requests a voice SID, the MAC scheduler on the

CiscouBR10012router schedules fixed periodic slots on the upstream for that traffic flow. The CM does

not have to contend for these slots and, because the CiscouBR10012router controls the timing of slots,

it has precise control over potential delay and jitter.

DOCSIS 1.0 MAC Driver

This DOCSIS 1.0 driver supports CableLabs specifications for the MAC sublayer and associated

interfaces. Refer to the “DOCSIS 1.0 MAC Enhancements to Improve Upstream per CM Data

Throughput” section on page20.

DOCSIS 1.0 Quality of Service Support

CiscouBR10012router software offers DOCSIS 1.0 Quality of Service (QoS) support. This allows you

to define service levels in order to map data packets efficiently into traffic classes. These traffic classes

determine how network resources are allocated and controlled. QoS can be delivered through a

combined use of IP precedence ToS bits and QoS capabilities of IP and ATM core networks.

CiscouBR10012router software supports varying QoS definitions for differentiated services:

•Guaranteed-rate service queue to store bandwidth requests from CMs subscribing to a class with

minimum upstream rate on the upstream channel.

•Best-effort service queue to store bandwidth requests from CMs subscribing to a class with no

minimum upstream rate on the upstream channel.

•Service priority of 7 to 0; a higher value indicates better service.

•Maximum allowed upstream rate in bps.

•Maximum upstream channel burst in minislots.

•Minimum reserved upstream rate in bps.

•Maximum allowed downstream rate in bps.

Additional information about the capabilities and configuration of DOCSIS QoS are described the

following documents:

•DOCSIS 1.1 Feature Module for the Cisco uBR7200 Routers

•Cisco IOS Quality of Service Solutions Configuration Guide, Release 12.2

•Cisco IOS Quality of Service Solutions Command Reference, Release 12.2

DOCSIS 1.0 supports tiered best-effort and CIR-type service. The CiscouBR10012router and CMTS

now support a mechanism to dynamically initiate and terminate MAC-level scheduling for high-priority

traffic, and to specify exactly what QoS parameters to use.