Cisco Systems uBR7200 manual Telco Return, MC-523

Configuring Headend Broadband Access Router Features

Telco Return

Figure 107 Two-Way IP Telephony Network Diagram

	Gateway/PSTN
Service
provider
backbone
Cisco uBR7200	Cisco uBR7200
series	series
Gatekeeper or	Policy
calling agents	server
HFC	HFC
cable plant	cable plant
Remote	Remote
cable modem	cable modem

		Calling party	Called party
	Residence or SOHO*		Residence or SOHO*
		subscriber site 1	subscriber site 2
*Small Office Home Office

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The Cisco uBR7200 series equipment and DOCSIS-based cable modems supporting IP telephony can be configured to treat VoIP and regular data traffic separately. The system can be configured to keep regular data on a default class of service, while using a higher priority for the VoIP traffic that originates on the VoIP ports of the cable modem.

When creating a configuration for remote cable modems, the Cisco uBR7200 series system administrator typically configures extra classes of service. These secondary classes of service are expected to be higher QoS classes that are used by higher priority traffic such as voice. These classes have a minimum upstream rate specified for the channel.

System administrators can associate unique packet flows with a unique SID. These images support multiple SIDs per cable modem.

Note The cable modem must also support these higher classes of service.

Telco Return

Cisco uBR7200 series routers can register third-party DOCSIS-based telco return cable modems based on the DOCSIS telco return specification. This feature enables the HFC network to support both two-way and telco return cable modems.

In telco return configurations, the Cisco uBR7200 series router provides downstream dataflow from cable modem cards connected to the cable system and accepts upstream traffic via a combination of the local public switched telephone network (PSTN) and IP network path that terminates at the

Cisco IOS Multiservice Applications Configuration Guide

MC-523