Wideband Channel Bonding - Cisco WCM300 - Channel Bonded Cable Modem Implementation Manual

Cable wideband solution design and implementation guide, release 1.0

Table of Contents

Cisco Cable Wideband Architecture

This chapter explains the architecture used for the Cisco Cable Wideband Solution, Release 1.0. It

explains the following topics:

•

The DOCSIS 3.0 Downstream Channel Bonding feature is backward compatible with DOCSIS 1.X/2.0

services and networks.

Wideband Channel Bonding

The DOCSIS 3.0 Downstream Channel Bonding feature uses a selected subset of the DOCSIS 3.0

downstream channel bonding protocol.

With channel bonding, bandwidth is increased by combining or bonding multiple RF channels to create

a wideband channel. The DOCSIS 3.0 Downstream Channel Bonding feature affects the CMTS and the

cable modem as well as the provisioning and network management systems.

The core of the DOCSIS 3.0 Downstream Channel Bonding feature is the sending of DOCSIS packets

for a given service flow across multiple RF channels. The transmit framer in the Cisco Wideband SPA

"stripes" the DOCSIS packets for a given flow and transmits them across the multiple RF channels of

the wideband channel. When the packets are received at the wideband cable modem, the modem's

receiver framer uses a sequence number embedded in each DOCSIS packet to reassemble the packets

into the original flow.

A wideband channel is a unique combination of downstream RF channels. The wideband CMTS

manages up to 24 wideband channels (12 wideband channels per Wideband SPA). A wideband cable

modem joins a wideband channel. Many wideband cable modems can share the same wideband channel.

In this document, the terms wideband channel, bonded channel, bonding group have the same meaning:

a logical grouping of one or more physical radio frequency (RF) channels over which MPEG-TS packets

are carried.

OL-10705-02

Cisco Cable Wideband Solution Design and Implementation Guide, Release 1.0

C H A P T E R

3-1

Table of Contents