Specifications
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Cisco Cable Modem Termination System Feature Guide
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Chapter 3 Spectrum Management for the Cisco Cable Modem Termination System
Monitoring Spectrum Management
Using CLI Commands
The following commands provide information on the spectrum condition of an upstream:
Note The show cable flap-list command displays the CMTS router’s flap list, which can provide additional
information about whether cable modems on an upstream are experiencing problems, and if so, what
type of problems are occurring. For more information, see Chapter 2, “Flap-List Troubleshooting for the
Cisco Cable Modem Termination System”.
Using SNMP
When you are using Cisco IOS Release 12.2(8)BC2 and later 12.2 BC releases and the
Cisco uBR-MC16S cable interface line card, you can use SNMP to monitor the spectrum management
activity. The SNMP manager can be a graphically based SNMP manager such as CiscoView or a
specialized tool such as the DOCSIS Cable Modem Test Analyzer (DCMTA), available from Acterna
Corporation.
Tip See the next section, “Using the DOCSIS Cable Modem Test Analyzer” section on page 3-55, for more
information on the DCMTA tool.
Command Purpose
Router# show cable hop [c
x/y
]
[upstream
usport
]
Displays the hop period and hop threshold values, as well
as the FEC error counters, for all upstreams in the router,
all upstreams on one cable interface line card, or a single
upstream.
Router# show cable modem [
ip-address
|
interface
|
mac-address
] [
options
]
Displays information, including SNR values, for the
registered and unregistered cable modems.
Note Cisco IOS Release 12.2(8)BC2 and later 12.2 BC
releases also support a cnr option that displays the
CNR value for a specific cable modem, if it is
using an upstream on the Cisco uBR-MC16S
cable interface line card.
Router# show cable modulation-profile
[
num
] [initial | long | reqdata |
request | short | station ]
Displays the configuration for all modulation profiles, for
a particular modulation profile, or for a specific burst type
for a particular modulation profile.
Router# show cable spectrum-group
[
groupnum
] [detail]
Displays information about the spectrum groups that have
been configured.
Note The detail keyword is supported only in
Cisco IOS Release 12.2(8)BC2 and later 12.2 BC
releases.
Router# show controllers cable
x/y
upstream
n
[
ip-address
|
mac-address
]
start-freq end-freq
res-freq
Displays the upstream’s status, including the current
frequency, channel width, modulation rate, and spectrum
groups.
Router# show controllers cable
x/y
upstream
n
spectrum [
ip-address
|
mac-address
]
start-freq end-freq
res-freq
(For Cisco uBR-MC16S only)
Displays the noise levels for a particular cable modem or
displays the background noise for an entire upstream.