Installation guide

5-13
Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
OL-2238-03
Chapter 5 Troubleshooting the System
Managing Cable Modems on the HFC Network
Sample output:
noisy1# show cable hop
Upstream Port Poll Missed Min Missed Hop Hop Corr Uncorr
Port Status Rate Poll Poll Poll Thres Period FEC FEC
(ms) Count Sample Pcnt Pcnt (sec) Errors Errors
Cable1/0/U0 down 1000 * * * frequency not set * * * 0 0
Cable1/0/U1 admindown 1000 * * * interface is down * * * 0 0
Cable1/0/U2 admindown 1000 * * * interface is down * * * 0 0
Cable1/0/U3 admindown 1000 * * * interface is down * * * 0 0
Cable1/0/U0 10.800 Mhz 1000 0 0 ----- 100% 300 0 0
Cable1/0/U0 down 1000 * * * frequency not set * * * 0 0
Spectrum Management Debug and Test Commands
To enable display of frequency hopping debugging messages, enter:
debug cable freqhop
To enable display of spectrum management debugging messages, enter:
debug cable specmgmt
This command also enables display of channel width list and offer list for the
show cable spectrum-group command.
To force a frequency hop decision on the port or ports, enter:
test cable hop cable-if [upstream portnum]
show cable hop Command
You can use the following command to obtain specific upstream interface information:
show cable hop cable-if [upstream portnum]
Corr FEC Errors The number of correctable FEC errors on this upstream port
Uncorr FEC Errors The number of uncorrectable FEC errors on this upstream port
Table 5-1 show cable hop Command Parameters (continued)
Field Description
Table 5-2 show cable hop Command Parameter Descriptions
Field Description
Upstream Port
Upstream port for this information line
Port Status
Shows “down” if frequency is unassigned, “admindown” if the port is
shutdown, or the center frequency of the channel if the port is up
Poll Rate
Rate that station maintenance polls are generated (msec)
Missed Poll Count
Number of missing polls
Min Poll Sample
Number of polls in the sample
Missed Poll Pcnt
Ratio of missing polls to the number of polls expressed as a percentage