user manual

Configuring Headend Broadband Access Router Features
Telco Return
MC-523
Cisco IOS Multiservice Applications Configuration Guide
Figure 107 Two-Way IP Telephony Network Diagram
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
25659
Gatekeeper or
calling agents
Service
provider
backbone
HFC
cable plant
HFC
cable plant
Remote
cable modem
Remote
cable modem
Cisco uBR7200
series
Cisco uBR7200
series
Gateway/PSTN
Calling party
Residence or SOHO*
subscriber site 1
Residence or SOHO*
subscriber site 2
Called party
Policy
server
*Small Office Home Office