Specifications

3-44
Cisco Cable Modem Termination System Feature Guide
0L-1467-02
Chapter 3 Spectrum Management for the Cisco Cable Modem Termination System
Configuration Tasks
1 23.120 [1.60] Cable3/0 U2 0
1 22.832 [1.60] Cable3/0 U3 0
1 22.896 [1.60] Cable3/0 U4 0
1 23.024 [1.60] Cable3/0 U5 0
1 23.152 [1.60] Cable4/0 U1 0
1 22.896 [1.60] Cable4/0 U0 0
1 22.896 [1.60] Cable4/0 U2 0
1 20.784 [1.60] Cable4/0 U3 0
1 22.928 [1.60] Cable4/0 U4 0
1 22.960 [1.60] Cable4/0 U5 0
Step 6 To display the current CNR value for a particular cable modem, use the show cable modem cnr
command in privileged EXEC mode:
CMTS# show cable modem 10.240.179.234 cnr
MAC Address IP Address I/F MAC Prim CNR
State Sid (db)
0020.40bc.3588 10.240.179.234 C3/0/U2 online 2 38.0
CMTS# show cable modem 10.240.179.51 cnr
MAC Address IP Address I/F MAC Prim CNR
State Sid (db)
0020.40ef.4be0 10.240.179.51 C3/0/U5 online 11 39.5
CMTS#
Advanced Spectrum Management Configuration Tasks (Cisco uBR10012)
The following sections describe the configuration tasks that are needed to configure the Cisco uBR10012
router for the Intelligent and Advanced spectrum management features that are available when using the
Cisco uBR-LCP2-MC16S cable interface line card.
• “Configuring Spectrum Groups” section on page 3-44
• “Configuring Upstream Modulation” section on page 3-46
• “Configuring Proactive Channel Management” section on page 3-47
• “Verifying the Spectrum Management Configuration” section on page 3-48
Note This section describes the configuration that is needed to comply with the limitations and restrictions
that are documented in the “Cisco uBR10012 Router and Cisco IOS Release 12.2(8)BC2 Support”
section on page 3-19. Do not use the commands in this section to configure the Cisco uBR7200 series
router with the Cisco uBR-MC16S cable interface line card. Instead, use the instructions given in the
“Advanced Spectrum Management Configuration Tasks (Cisco uBR7200 Series)” section on page 3-36.
Configuring Spectrum Groups
Frequency hopping requires creating one or more spectrum groups, which define the specific frequencies
that are available to an upstream. A spectrum group can contain a range of frequencies as well as a list
of specific frequencies. This allows efficient frequency hopping, so that upstreams can avoid frequencies
that have known interference and other ingress noise problems.