Specifications

3-21
Cisco Cable Modem Termination System Feature Guide
0L-1467-02
Chapter 3 Spectrum Management for the Cisco Cable Modem Termination System
Prerequisites
Constant use of the DCMTA tool could result in excessive volumes of SNMP traffic that affects network
bandwidth and performance on the Cisco uBR7200 series CMTS. For this reason, Cisco recommends
against running the DCMTA software continuously. Instead, start the software when needed and exit it
after the problem has been resolved.
HCCP 1+1 and N+1 Redundancy Support for the Cisco uBR-MC16S Cable Interface Line Card
Cisco IOS Release 12.1(7)EC adds support for the Cisco uBR-MC16S cable interface line card when
used in an HCCP 1+1 redundant configuration. Previously, the Cisco uBR-MC16S card could be used in
a redundant configuration only by first disabling its intelligent spectrum management features.
In Cisco IOS Release 12.1(7)EC and later, the Cisco uBR-MC16S card can be used as the protect cable
interface or working cable interface, with either another Cisco uBR-MC16S card or a
Cisco uBR-MC16C card. Table 5 shows how a switchover in each of these configurations affects the
Intelligent spectrum management features of the Cisco uBR-MC16S card.
Note HCCP 1+1 or N+1 support for the Cisco uBR-MC16S card exists only in Cisco IOS Release
12.1(7)EC or later 12.1 EC release and in Cisco 12.2(8)BC2 or later 12.2 BC release. Therefore
you cannot use the Advanced spectrum management features in Cisco IOS Release 12.1(7)CX
with an HCCP 1+1 or N+1 redundant configuration.
Prerequisites
• The appropriate Cisco IOS release for the desired features. For a list of supported Cisco IOS releases
by feature, see Table 3-2 on page 3-8.
• For Guided and Scheduled spectrum management features, Cisco uBR-MC11C,
Cisco uBR-MC12C, Cisco uBR-MC14C, Cisco uBR-MC16, and Cisco uBR-MC28C cable
interface line cards.
Table 5 Switchover Operation for a Cisco uBR-MC16C/Cisco uBR-MC16S Configuration
Working Cable
Interface
Protect Cable
Interface Operation After Switchover
Cisco uBR-MC16C Cisco uBR-MC16S The protect card (Cisco uBR-MC16S) uses the same
upstream frequency as the working card, but after the
system stabilizes, the protect card begins using the
Intelligent spectrum management features of the
Cisco uBR-MC16S card, as configured on the protect
CMTS.
Cisco uBR-MC16S Cisco uBR-MC16C The protect card (Cisco uBR-MC16C) uses the same
upstream frequency as the working card. If the upstream
becomes unstable, the Cisco uBR-MC16C performs only
guided frequency hopping.
Cisco uBR-MC16S Cisco uBR-MC16S The protect card initially uses the same upstream frequency
as the working card, but after the system stabilizes, the
protect card continues using the Intelligent spectrum
management features of the Cisco uBR-MC16S card.