Multiservice Architecture; M-Cmts Interactions With Wideband Cable Modems; Mac Domains - Cisco WCM300 - Channel Bonded Cable Modem Implementation Manual

Modular CMTS

Multiservice Architecture

With M-CMTS architecture, the use of external edge QAM devices allows MSOs to use the same
network resources for a video on demand (VOD) network and a Cisco wideband cable network. With
updated firmware, some edge QAM devices can be used for VOD and for wideband channels though
individual output QAM channels in the device cannot be shared.
The wideband channel uses the edge QAM device for downstream data traffic, and uses the M-CMTS's
uBR10-MC5X20 cable interface line card for upstream traffic and for downstream MAC management
and signaling messages.
In the Cisco Cable Wideband Solution, Release 1.0, traditional DOCSIS 1.X/2.0 services are supported
by the CMTS; uBR10-MC5X20 cable interface line cards (not edge QAM devices) are used for these
services.
A multiservice architecture (see
services) on wideband channels is the ultimate goal for DOCSIS 3.0 services.
Figure 3-4
Video over MPEG-TS
Video over IP
Data over IP
Voice over IP
In the Cisco Cable Wideband Solution, Release 1.0, the uBR1012 router currently supports a data-only
Note
service on wideband channels. A Cisco Cable Wideband Solution, Release 1.0, system does not
currently support video or voice on wideband channels.

M-CMTS Interactions with Wideband Cable Modems

The following sections provide information on interactions between the M-CMTS and wideband cable
modems:
•
•
•
•

MAC Domains

A DOCSIS MAC Domain is a logical subcomponent of a CMTS and is responsible for implementing all
DOCSIS functions on a set of downstream channels and upstream channels. All MAC Domain
operations are performed by the Core CMTS's uBR10-MC5X20 cable interface line cards. A CMTS
MAC Domain contains at least one downstream channel and at least one upstream channel. Each
downstream channel or upstream channel is contained by a single MAC Domain.
Cisco Cable Wideband Solution Design and Implementation Guide, Release 1.0
3-6
M-CMTS Multiservice Architecture
uBR10012
M-CMTS
Core
MAC Domains, page 3-6
Addressing, page 3-7
Security, page 3-7
Quality of Service, page 3-8
Figure 3-4) with converged IP triple play (voice, data, and video
DOCSIS 3.0 Downstream
Channel Bonding
Traditional DOCSIS 1.X/2.0 channels
Chapter 3 Cisco Cable Wideband Architecture
Edge QAM
device
OL-10705-02