Specifications

21
Release Notes for Cisco uBR924 Cable Access Router for Cisco IOS Release 12.1(5)T
OL-0385-04 Rev. B0 (2/2001)
Important Notes
Last Maintenance Release of Cisco IOS Release 12.1 T
The last maintenance release of the 12.1 T release train is 12.1(5)T. The migration path for customers
who need bug fixes for the 12.1 T features is the 12.2 mainline release. The 12.2 mainline release has
the complete feature content of 12.1 T and will eventually reach general deployment (GD).
The last maintenance release was renamed from 12.1(4)T to 12.1(5)T to synchronize with its parent
software base, the 12.1(5) mainline release, and to reflect that 12.1(5)T has all the bug fixes of the
12.1(5) mainline release. The 12.1 T release train is a superset of the 12.1 mainline release; hence any
defect fixed in the 12.1 mainline is also fixed in 12.1 T. The set of features for 12.1(4)T is the same as
that for 12.1(5)T. There was no change in the feature content of the release. The release was renamed
so that the releases would be consistent with the Cisco release process.
Supplemental and Corrected Text for the Online Feature Module
Troubleshooting Tips for the uBR924 Cable Access Router, page 15, indicates:
“Some CATV systems use alternative frequency plans such as the IRC (Incrementally Related
Carrier) and HRC (Harmonically Related Carrier) plans. Most of the IRC channel slots overlap the
EIA plan. The HRC plan is not supported by Cisco’s cable access routers since so few cable plants
are using this plan.”
The correction should read:
“For the Cisco uBR924 Cable Access Router, both the IRC (Incrementally Related Carrier) and
HRC (Harmonically Related Carrier) plans are supported. Most of the IRC channel slots overlap
the EIA plan. For the Cisco uBR924 Cable Access Router, both the IRC and HRC plans are
supported.
“The list of downstream search bands added for HRC have appropriate center frequencies and step
values for an HRC channel plan. The expanded search band list may increase the amount of time
required by the Cisco uBR924 Cable Access Router to acquire the downstream signal on the HRC
channel plan, which can add to the total time for complete registration of the modem the very first
time it is added to the cable system.”
Supported MIBs
The Cisco uBR924 Cable Access Router supports the following categories of MIBs:
• Cable Device MIBs—These MIBs are for DOCSIS-compliant cable modems and CMTS to record
statistics related to the configuration and status of the cable modem. These MIBs include support
for the MIB attributes defined in RFC 2669.
• Cisco’s standard MIBs—These MIBs are common across most of Cisco’s router platforms. If your
network management applications are already configured to support other Cisco routers, such as
the Cisco 2600 series or Cisco 7200 series, no further configuration is needed unless the version of
Cisco IOS software being used has updated these MIBs.
• Cisco Voice MIBs—These MIBs are common across Cisco’s router platforms that support
Voice over IP (VoIP). These MIBS provide access to voice-related parameters and statistics,
including the SGCP protocol.
• Radio Frequency Interface MIBs—These MIBs are for DOCSIS-compliant radio frequency
interfaces in cable modems and CMTS. This MIB includes support for the MIB attributes defined
in RFC 2670.