Troubleshooting guide

Troubleshooting the CMTS
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interface is the number of the cable interface
port is the number of the upstream port
2. To view the modulation profile for the upstream port to determine whether
QAM 16 or QPSK modulation is used on the upstream interface, use the show
cable modulation-profile command in Privileged EXEC mode as shown in
the following example:
RDN#show cable modulation-profile <n>
where:
n is the modulation profile number
3. View the show cable modulation-profile command output to determine
whether the upstream modulation is 16 QAM or QPSK.
4. To determine the signal quality on the upstream port, use the show interfaces
cable signal-quality command in Privileged EXEC mode, as shown in the
following example:
RDN#show cable interface <slot>/<port> signal-quality
where:
slot is the slot number of the DOCSIS module on the BSR 64000
interface is the cable interface number
Signal quality statistics for all the upstream interfaces (ports) displays.
Note: The slot and interface number on the BSR 1000 are 0.
Note: The BSR 1000 uses the same syntax as the above command,
however both the slot number and interface number are set to zero.