Cisco Broadband Cable Command Reference Guide

cable upstream power-adjust
cable upstream power-adjust
Syntax Description
2-232
Cisco Broadband Cable Command Reference Guide
Chapter 2 Cisco Cable Modem Termination System Commands
To control power-adjustment methods on the Cisco CMTS, use the cable upstream power-adjust
command in cable interface configuration mode. To return to the default values, use the no form of this
command.
cable upstream n power-adjust {continue pwr-level | noise perc-pwr-adj | threshold value}
no cable upstream n power-adjust {continue | noise | threshold}
Defaults The continue option defaults to 2 dB, the noise option defaults to 30 percent, and the threshold option
defaults to 1 dB.
Command Modes Interface configuration (cable interface only)
Command History
n Specifies the upstream port number. Valid values start with 0 for the
first upstream port on the cable interface line card.
continue pwr-level Specifies the power threshold value that determines the value of the
Ranging Status field in the Ranging Response (RNG-RSP) messages
that the CMTS sends to the CM. The valid range is from 2 to 15 dB,
with a default of 2 dB.
threshold value Specifies the power adjustment threshold. The threshold range is
from 0 to 10 dB, with a default of 1 dB.
noise perc-pwr-adj Specifies the percentage of power adjustment packets that is required
to change the adjustment method from the regular power-adjustment
method to the noise power-adjustment method, which uses an
averaging algorithm to smooth out wide jumps in the power level.
The valid range is 10 to 100 percent, with a default of 30 percent.
Release Modification
12.0(7)T This command was introduced.
Usage Guidelines When a CM comes online, it sets itself for the optimal power level, as determined by the CMTS. As the
CMTS periodically polls each CM, the CMTS examines the CM’s power level and orders the CM to
adjust its power level to adapt to current total attenuation between it and the CMTS. These power
adjustments can be required because of temperature variations, upstream frequency hopping, or
increased attenuation that has been added either intentionally or unintentionally. The cable upstream
power-adjust command controls how the CMTS makes these power adjustments.
Note To set the upstream power level on the CMTS, see cable upstream power-level, page 2-236.
OL-1581-05