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
Configuration Tasks
Verifying Frequency Hopping
You can verify frequency hopping on the CMTS either by using command-line interface (CLI)
commands or by using an RF tone generator.
Verifying Frequency Hopping Using CLI Commands
To verify frequency hopping using CLI commands, use the following procedure:
Step 1 Verify that the interface being tested is up, using the show interface cable command in privileged EXEC
mode. The first line of the output should show that both the interface and line protocol are up. (The
following examples assume that the cable interface is in slot 6.)
CMTS01# show interface c6/0
Cable6/0 is up, line protocol is up
Hardware is BCM3210 ASIC, address is 000a.13e8.1ca8 (bia 000a.13e8.1ca8)
Internet address is 10.20.114.33/27
MTU 1500 bytes, BW 27000 Kbit, DLY 1000 usec,
...
Step 2 Verify that the upstream being tested is up, using the show interface cable upstream command. The
first line shows that the upstream is up. (This example assumes that upstream 5 is being tested.)
CMTS01# show interface c6/0 upstream 5
Cable6/0: Upstream 5 is up
Received 8 broadcasts, 0 multicasts, 6388105 unicasts
0 discards, 0 errors, 0 unknown protocol
6388113 packets input, 0 uncorrectable
0 noise, 0 microreflections
Total Modems On This Upstream Channel : 23 (22 active)
CMTS01#
Step 3 Use the show cable hop upstream command to display the frequency that the upstream is currently
using:
CMTS01# show cable hop c6/0 upstream 5
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
Cable6/0/U5 16.816 Mhz 1000 0 10 0% 20% 25 0 0
Step 4 Use the test cable hop command to force the desired upstream to perform a frequency hop. A few
seconds after giving the command, a console message should appear informing you of the hop. Repeat
the command as needed to verify that all of the frequencies shown are within the spectrum group that
has been assigned to the upstream.
CMTS01# test cable hop c6/0 upstream 5
2w0d: %UBR7200-5-USFREQCHG: Interface Cable6/0 Port U5, frequency changed to 15.760 MHz
CMTS01# test cable hop c6/0 upstream 5
2w0d: %UBR7200-5-USFREQCHG: Interface Cable6/0 Port U5, frequency changed to 26.832 MHz