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
ccsHoppingNotification
Table 3-11 describes the attributes contained in the notification that is sent after each frequency hop:
Using the DOCSIS Cable Modem Test Analyzer
The DOCSIS Cable Modem Test Analyzer (DCMTA) is a software tool that provides spectrum analyzer
capability on the Cisco uBR7200 series CMTS for troubleshooting problems with an individual
upstream port or an individual cable modem. The DCMTA works together with the Cisco uBR-MC16S
line card on a Cisco CMTS running Cisco IOS Release 12.2(8)BC2 and later 12.2 BC releases to display
the return path spectral information from the line card and its related ports.
The DCMTA software uses SNMP requests to obtain the spectrum data from the
CISCO-CABLE-SPECTRUM-MIB and displays this data in a graphical interface. The DCMTA
software runs on a Windows PC and supports simultaneous client access to a single and multiple CMTS
routers, upstreams, and cable modems. The software and its Windows PC can be located anywhere in
your network that offers connectivity with the Cisco CMTS.
The DCMTA software provides the ability to perform real-time diagnosis of the return path, as well as
live troubleshooting of an upstream port or individual cable modem. The software uses simple menus
and interactive screens, allowing users to analyze the return path performance in real time as problems
occur. The software offers multiple views of the spectrum management data, providing a flexible
interface for isolating, characterizing, and diagnosing problems, so that technicians can make intelligent
decisions about how to respond to problems in the return path.
Tip For more information about the DCMTA software, contact Acterna Corporation. In North America, call
1-800-638-2049 or [phone] (20400 Observation Drive, Germantown, MD, USA 20876-4023).
For other locations, see their web site at http://www.acterna.com.
Follow these guidelines when using the DCMTA software tool:
Table 3-11 ccsHoppingNotification Attributes
Attribute Type Description
ccsUpSpecMgmtHopCondition INTEGER Reports the condition that triggers a
frequency hop (SNR value or percentage of
modems going offline)
ccsUpSpecMgmtFromCenterFreq CCSFrequency Provides the center frequency (in KHz)
before the latest frequency hop
ccsUpSpecMgmtToCenterFreq CCSFrequency Provides the current center frequency (in
KHz) after the latest frequency hop
ccsUpSpecMgmtFromBandWidth CCSFrequency Provides the channel width (in KHz) before
the latest frequency hop
ccsUpSpecMgmtToBandWidth CCSFrequency Provides the current channel width (in
KHz) after the latest frequency hop
ccsUpSpecMgmtFromModProfile Integer32 Provides the modulation profile number
before the latest frequency hop
ccsUpSpecMgmtToModProfile Integer32 Provides the current modulation profile
number after the latest frequency hop