Installation guide

5-20
Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
OL-2238-03
Chapter 5 Troubleshooting the System
Understanding Show Command Responses
• The Tx Timing Offset shows the current round trip time at the CM. The value is used to synchronize
upstream transmission to the CMTS and is measured in units of 6.25 microseconds.
• The Micro (dB) Reflection column is the total microreflections including in-channel response as
perceived on this interface, measured in Dbc below the signal level.
Note The value is not assumed to return an absolutely accurate value, but gives a rough indication
of microreflections received on this interface.
• The Offline Time column reveals when a modem went offline.
• The Previous State column reveals the modem’s status prior to going offline.
• The Rx Power column reveals the last receive power measurement for a modem that is offline before
it went offline.
• SM Exhaust Count reveals the number of times the CMTS declared that modem offline. The modem
can be marked offline for various reasons. Refer to the “show cable modem maintenance Command”
section on page 5-21.
See the following sample for detailed output of the show cable modem command:
Router# show cable modem detail
Interface SID MAC address Max CPE Concatenation Rx SNR
Cable1/0/U0 1 0090.8330.0215 3 yes
Cable1/0/U0 2 0090.8330.0213 3 yes
Cable1/0/U0 3 0090.8330.0214 3 yes
Cable1/0/U0 4 0090.8330.0217 3 yes
Cable1/0/U0 5 0090.8330.020f 3 yes
Cable1/0/U0 6 0050.7366.17e3 3 no
Cable1/0/U0 7 0090.8330.0211 3 yes
Cable1/0/U0 8 0050.7366.17af 3 no
Cable1/0/U0 9 0090.8330.0216 3 yes
Cable1/0/U0 10 0050.7366.1801 3 no
Cable1/0/U0 11 0050.7366.124d 3 no
Cable1/0/U0 12 0050.7366.1241 3 no
Cable1/0/U0 13 0050.7366.17db 3 no
Cable1/0/U0 14 0050.7366.1239 3 no
Cable1/0/U0 15 0050.7366.17ab 3 no
Cable1/0/U0 1 0050.7366.1db1 3 no 26.50
Cable1/0/U1 2 0050.7318.e97f 3 no 23.87
Cable1/0/U1 3 0050.7318.e965 3 no 23.85
Cable1/0/U0 4 0050.7318.e931 3 no 26.72
Cable1/0/U1 5 0050.7318.e92d 3 no 23.31
Cable1/0/U1 6 0050.7318.e97b 3 no 23.85
Cable1/0/U0 7 0050.7366.1d8d 3 no 26.88
Cable1/0/U0 8 0050.7318.e953 3 no 26.54
Cable1/0/U1 9 0050.7366.1d9d 3 no 23.72
Cable1/0/U1 10 0050.7318.e96b 3 no 23.79
Cable1/0/U1 11 0050.7366.1d95 3 no 23.82
Cable1/0/U0 12 0050.7318.e93f 3 no 26.26
Cable1/0/U1 13 0050.7318.e96d 3 no 23.51
Cable1/0/U0 14 0050.7318.e941 3 no 26.69
Cable1/0/U0 15 0050.7366.1dcd 3 no 26.94
Cable1/0/U1 16 0050.7318.e939 3 no 23.98
Cable1/0/U0 17 0050.7366.1d8f 3 no 27.13
Cable1/0/U0 18 0050.7302.3da3 3 no 26.58
Cable1/0/U0 19 0050.7318.e93b 3 no 26.49
Cable1/0/U0 20 0050.7318.e901 3 no 26.68
Cable1/0/U1 21 0050.7366.1dbb 3 no 23.45
Cable1/0/U0 22 0050.7318.e957 3 no 26.35