Specifications

7
Release Notes for Cisco uBR924 Cable Access Router for Cisco IOS Release 12.1(5)T
OL-0385-04 Rev. B0 (2/2001)
System Requirements
To configure the Cisco uBR924 Cable Access Router to support multiple classes of service, use either
the Cisco Subscriber Registration Center (CSRC) tool or the configuration file editor of your choice.
DOCSIS configuration files can contain multiple classes of service (CoS) to support voice. The first
CoS is used for data (and voice if no other CoS is defined), and up to three additional classes of service
can be defined to give higher priority for voice traffic.
IPSec Encryption Support
To use IPSec encryption, both the Cisco uBR924 Cable Access Router and the destination endpoint
must support IPSec encryption and be configured for the same encryption policy. The endpoint is
typically an IPSec gateway such as a peer router, PIX Firewall, or other device that can be configured
for IPSec. (The CMTS does not need to support IPSec encryption unless it is desired that the CMTS act
as an IPSec gateway.)
Note The IPSec feature set encrypts traffic sent between endpoints, such as between two
Cisco uBR924 Cable Access Routers, to protect traffic sent across the Internet and other
unprotected networks. The DOCSIS BPI feature encrypts traffic on the cable interface,
between the Cisco uBR924 Cable Access Router and the CMTS. To use BPI encryption,
both the Cisco uBR924 Cable Access Router and the CMTS must support and enable BPI
encryption.
Voice Protocol Support
When using a voice-enabled Cisco IOS Release 12.1 image, the Cisco uBR924 Cable Access Router
can packetize and transport voice in compliance with the H.323 protocol. H.323v2 is integrated in
Cisco gatekeeper/gateway products, such as the Cisco 2600 series and Cisco 3600 series, using
Cisco IOS Release 12.0(5)T. The gatekeeper must be running Cisco IOS Release 12.0(5)T or greater to
support registration of the full E.164 address for each Cisco uBR924 Cable Access Router voice port.
The Cisco uBR924 Cable Access Router also supports the Simple Gateway Control Protocol (SGCP)
when using voice-enabled Cisco IOS Release 12.1 images. SGCP is an alternative to the H.323 protocol
that provides signaling and feature negotiation via a remote Call Agent. SGCP eliminates the need for
a dial plan mapper. It also eliminates the need for static configuration on the router to map IP addresses
to telephone numbers because this function is provided by the remote Call Agent.
Hardware Supported
The Cisco uBR924 Cable Access Router contains the following interfaces:
• A single F-connector interface to the cable system.
• Four RJ-45 (10BaseT Ethernet) hub ports to connect:
– Up to 254 computers directly to the four Ethernet hub ports at the rear of the
Cisco uBR924 router when operating in bridging mode. When operating in routing mode, all
four Ethernet hub ports can be connected directly to four computers.