Installation guide

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Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
OL-2238-03
Chapter 3 Configuring the Cisco Cable Interface
Configuring the Upstream Cable Interface
Verifying Upstream Power Adjustment
To determine if upstream power adjustment is configured and activated, enter the show running-config
command and look for the cable interface configuration information. If upstream power adjustment is
enabled, any or all three of the continue, noise, and threshold power adjustment entries are displayed
in the show running-config output. If all three continue, noise, and threshold upstream power
adjustments are disabled, no power adjustment entry displays in the show running-config output.
Activating Upstream Timing Adjustment
To enable upstream timing adjustment for a specified cable interface, use one of the following commands
in cable interface configuration mode.
To return the upstream time adjustment ranging value to the default of 2 seconds, enter the following
command in cable interface configuration mode:
CMTS01(config-if)# no cable upstream usport time-adjust continue
To return the upstream time adjustment threshold value to the default of 1 second, enter the following
command in cable interface configuration mode:
CMTS01(config-if)# no cable upstream usport time-adjust threshold
Verifying Upstream Timing Adjustment
To determine if upstream timing adjustment is configured and activated, enter the show running-config
command and look for the cable interface configuration information. If upstream timing adjustment is
enabled, either or both of the continue and threshold timing adjustment entries are displayed in the
show running-config output. If both the continue and threshold upstream timing adjustments are
disabled, no timing adjustment entry displays in the show running-config output.
Tip If you are having difficulty with verification, make sure the cable connections are not loose or
disconnected; the cable modem card is firmly seated in its chassis slot; the captive installation screws
are tight; you have entered the correct slot and port numbers.
Activating the Upstream Ports
Each upstream port must be activated to enable upstream data transmission from the cable modems on
the HFC network to the Cisco uBR7100 series CMTS.
Command Purpose
CMTS01(config-if)# cable upstream usport
time-adjust continue seconds
Set the minimum timing adjustment that allows
continued ranging status. Valid values are
2 to 64 seconds. Default = 2 seconds.
CMTS01(config-if)# cable upstream usport
time-adjust threshold seconds
Set the timing adjustment threshold value in
seconds. Valid values are 1 to 32 seconds.
Default = 1 second.
CMTS01(config-if)# end
CMTS01#
Return to enable (privileged EXEC) mode.