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Troubleshooting Wideband Components
The ping docsis command uses 1/64—the bandwidth of IP ping—and works with cable modems that
have not yet acquired an IP address. This allows cable operators to ping cable modems that are unable
to complete registration, that have internal bugs, or that are unresponsive due to a crash.
The ping docsis command with the verbose keyword includes a real-time view and plot of requested
power adjustments, frequency, timing offset adjustments, and a measure of optimal headend reception
power.
Router# ping docsis 1.11.0.5 verbose
Queueing 5 MAC-layer station maintenance intervals, timeout is 25 msec:
Reply from 0014.bfbe.3e3c: 46 ms, tadj=1, padj=0, fadj=34
Reply from 0014.bfbe.3e3c: 46 ms, tadj=0, padj=0, fadj=26
Reply from 0014.bfbe.3e3c: 50 ms, tadj=0, padj=0, fadj=29
Reply from 0014.bfbe.3e3c: 50 ms, tadj=1, padj=0, fadj=29
Reply from 0014.bfbe.3e3c: 50 ms, tadj=-1, padj=0, fadj=39
Success rate is 100 percent (5/5)
For more information on the ping docsis command, see the
Guide.
Verifying That a Wideband-Capable Cable Modem is Registered as a Wideband Modem
To verify that a wideband-capable cable modem is registered as a wideband modem, use the show cable
modem command. In the following example, the MAC address of the wideband cable modem is
specified.
Router# show cable modem 0014.bfbe.3e70
MAC Address
0014.bfbe.3e70 1.11.0.3
If a wideband-capable cable modem is registered as a wideband modem, the MAC State field will have
one of the w-online values (wideband-online), such as w-online(pt) in the preceding example. For
descriptions of the complete set of MAC state values, see the show cable modem command in the
Broadband Cable Command Reference
A wideband-capable modem may also register as a DOCSIS 2.0 modem (for example, if a wideband
channel is not available). In this case, the MAC State field displayed by show cable modem will not
have one of the w-online values.
To determine the set of wideband-capable cable modems that have registered as wideband modems on
the CMTS, use the show cable modem wideband command.
Router# show cable modem wideband
MAC Address
0014.bfbe.3e70 1.11.0.3
0014.bfbe.3e3c 1.11.0.4
0016.92fb.5742 1.11.0.6
0016.92fb.580e 1.11.0.7
0014.bfbe.3eaa 1.11.0.2
0016.92fb.57f8 1.11.0.5
0016.92fb.57f4 1.11.0.8
To determine the set of wideband-capable cable modems that have registered as DOCSIS 2.0 modems
on the CMTS, use the show cable modem wideband command with the registered-traditional-docsis
keyword.
Cisco Cable Wideband Solution Design and Implementation Guide, Release 1.0
5-20
IP Address
I/F
C5/0/1/U0 w-online(pt) 1
Guide.
IP Address
I/F
C5/0/1/U0 w-online(pt)
C5/0/1/U0 w-online(pt)
C5/0/1/U0 w-online(pt)
C5/0/1/U0 w-online(pt)
C6/0/1/U0 w-online(pt)
C6/0/1/U0 w-online(pt)
C6/0/1/U0 w-online(pt)
Chapter 5
Monitoring and Troubleshooting Wideband Components
Cisco Broadband Cable Command Reference
MAC
Prim RxPwr
State
Sid
(dBmv) Offset CPE Enb
0.00
MAC
Prim
BG
State
Sid
ID
1
24
2
24
3
24
4
24
7
36
8
36
9
36
Timing Num BPI
1231
0
Y
Cisco
DSID
MD-DS-SG
24
N/A
24
N/A
256
1
264
1
36
N/A
298
1
306
1
OL-10705-02
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Troubleshooting
