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 the Spectrum Management Configuration
Step 1 To check the value of the settings you have entered, enter the show running-config command in
privileged EXEC mode at the Router# prompt:
Router# show running-config
To review changes you make to the configuration, use the show startup-config command in privileged
EXEC mode to display the information stored in NVRAM.
Step 2 To display modulation profile group information, use the show cable modulation-profile command in
privileged EXEC mode:
Router# show cable modulation-profile [ profile ] [ iuc-code ]
profile—(Optional) Profile number (1–8).
iuc-code—(Optional) Internal usage code (IUC). Valid options are:
– initial—Initial ranging burst
– long—Long grant burst
– request—Request burst
– reqdata—Request data burst
– short—Short grant burst
– station—Station ranging burst
Step 3 To display the status and configuration of each upstream, use the show controllers cable upstream
command in privileged EXEC mode. The following example shows the display for an upstream on a
Cisco uBR-LCP2-MC16S line card:
CMTS# show controllers c6/1/0 upstream
Cable6/1/0 Upstream 0 is up
Step 5
Router(config-if)# cable upstream n
threshold cnr-profile1 threshold1-in-dB
cnr-profile2 threshold2-in-dB corr-fec
fec-corrected uncorr-fec fec-uncorrected
(Optional) Specifies the CNR threshold and FEC values for the
upstream and its two modulation profiles.
n = upstream number on cable modem slot (on the
Cisco uBR-LCP2-MC16S, upstream port numbers are 0 to 5)
cnr-profile1 threshold1-in-dB = CNR threshold for the primary
modulation profile (5 to 35 dB, with a default of 16)
cnr-profile2 threshold1-in-dB = CNR threshold for the
secondary modulation profile (5 to 35 dB, must be less than that
for the primary modulation profile, with a default of 5)
corr-fec fec-corrected = FEC corrected threshold as a number
packets on the upstream (0 to 500 packets, with a default of 1)
uncorr-fec fec-uncorrected = FEC uncorrected threshold as a
number of packets on the upstream (0 to 500 packets, with a
default of 1)
Note Cisco recommends using the default values for all
parameters in this command.
Step 6
Router(config-if)# exit
Exits back to the configuration mode.
Command Purpose