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
Configuring Proactive Channel Management
To optimize the spectrum management behavior for your plant’s specific characteristics, you can
customize the following parameters:
• Optionally specify the priority of the corrective actions to be taken when noise on an upstream
exceeds the threshold for its modulation profile.
• Optionally configure the CNR threshold and FEC values for the upstream and its two modulation
profiles.
• Optionally specify the allowable range of channel widths that can be used if frequency hopping or
modulation switching cannot avoid the upstream problems.
Step 5
Router(config-if)# cable upstream n
modulation-profile primary-profile-number
secondary-profile-number
Adds the modulation profile to an upstream on the cable
interface.
n = upstream number on cable modem slot (on the
Cisco uBR-MC16S, upstream port numbers are 0–5)
primary-profile-number = the primary modulation profile
added to the interface.
secondary-profile-number = the secondary modulation profile
added to the interface.
Step 6
Router(config-if)# cable upstream n
modulation-profile primary-profile-number
secondary-profile-number
Repeat this command up to five times to configure the six
upstreams on the Cisco uBR-MC16S line card.
Step 7
Router(config-if)# exit
Exits back to the configuration mode.
Command Purpose
Command Purpose
Step 1
Router(config)# configure terminal
Enters configuration mode.
Step 2
Router(config)# interface type slot/port
Configures the interface where:
type = cable
slot = slot number in chassis (slot numbers begin with a 0)
port = port number on cable modem slot (port numbers begin
with a 0)
Step 3
Router(config-if)# cable upstream n
hop-priority frequency modulation
channel-width
or
Router(config)# cable upstream n
hop-priority modulation frequency
channel-width
or
Router(config)# cable upstream n
hop-priority frequency channel-width
modulation
(Optional) Specifies the priority of the three types of corrective
actions to be taken.
n = upstream number on cable modem slot (on the
Cisco uBR-MC16S, upstream port numbers are 0–5)
The three parameters (modulation, frequency, and
channel-width) specify the order of the corrective actions to be
taken when the noise for the upstream exceeds the threshold
specified for the current modulation profile. When setting the
allowable parameters, the channel-width option must always
appear after the frequency option.