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Chapter 2
Cisco CMTS Configuration Commands
cable flap-list power-adjust threshold
To specify the power-adjust threshold for recording a flap-list event, use the cable flap-list power-
adjust threshold command in global configuration mode. To disable power-adjust thresholds, use the
no form of this command.
Syntax Description
dB
Defaults
2 dB
Command Modes
Global configuration
Command History
Release
12.1 T
Usage Guidelines
This command controls the operation of a flapping modem detector. When the power adjustment of a
CM exceeds the configured threshold value, the modem is placed in the flap list.
A power adjustment threshold of less than 2 dB might cause excessive flap-list event recording. Cisco
Note
recommends setting this threshold value to 3 dB or higher.
For underground HFC networks with 4 amplifier cascade length, a typical threshold value should be 3
Note
dB. For overhead HFC networks with 4 amplifier cascade length, a typical threshold value should be 4
dB. Longer coaxial cascades without return path thermal gain control and sites with extreme daily
temperatures will have larger threshold ranges.
Examples
The following example shows the power-adjust threshold being set to 5 dB:
router(config)# cable flap-list power-adjust threshold 5
OL-1581-08
cable flap-list power-adjust threshold dB
no cable flap-list power-adjust threshold
Modification
This command was introduced.
Specifies the minimum power adjustment, in decibels, that results in a
flap-list event. Valid values are from 1 to 10 dB.
Cisco Broadband Cable Command Reference Guide
cable flap-list power-adjust threshold
2-101
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