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 Examples
Verifying Downstream Rate Limiting Example
To determine if downstream rate limiting is configured and activated, enter the show running-config
command and look for the cable interface configuration information. If downstream rate limiting is
configured and enabled, a rate limiting entry appears in the output. If downstream rate limiting is
disabled, no rate limiting entry appears.
CMTS01# show running-config
Building configuration...
Current configuration:
!
interface cable5/0/0
ip address 10.254.254.254 255.0.0.0
no ip directed-broadcast
cable helper-address 192.168.1.1
no keepalive
cable downstream rate-limit token-bucket shaping
cable downstream annex B
cable downstream modulation 64qam
Perform these steps if you are having difficulty with verification:
• Ensure that the cable connections are not loose or disconnected.
• Ensure that the cable interface line card is firmly seated in its chassis slot.
• Ensure that the captive installation screws are tight.
• Verify that you have entered the correct slot and port numbers
• Verify that you selected the default if you are not certain about the modulation rate needed.
• Verify the downstream carrier is active using the cable downstream if-output command.
Spectrum Group and Combiner Group Examples
Verifying Spectrum Group Creation Example
To verify that a spectrum group has been created, enter the show cable spectrum-group command:
CMTS01# show cable spectrum-group
spectrum-group 1
spectrum-group 2
spectrum-group 3
Time-Scheduled Spectrum Group Example
If your cable plant has an upstream noise characteristic on a weekly cycle, use time-scheduled spectrum
allocation. An example follows:
CMTS01(config)# cable spectrum-group 1 time Mon 08:00:00 frequency 21600000
Deletion is performed using the delete keyword:
CMTS01(config)# cable spectrum-group 1 time Mon 18:00:00 delete frequency 21600000