Release 1.0
Configuring the CMTS
526360-001-00 Rev. B
MGBI
6-149
Enabling and Disabling Spectrum Roll-back
The spectrum roll-back function is disabled by default and is used to return the
upstream channel width or modulation profile setting, that was adjusted during a hop
action, to the original configuration when upstream channel conditions improve.
Use the hop action rollback command in Cable Spectrum Group mode to enable the
spectrum roll-back function:
MOT(config-spcgrp:
<
WORD
>
)#
hop action rollback
where:
WORD
is the spectrum group name
.
Use the
no hop action rollback
command to disable the spectrum roll-back function.
Configuring the Guard Band
Use the
guard-band
command in Cable Spectrum Group mode to set the minimum
spectrum separation or spacing between upstream channels in the same spectrum
group.
MOT(config-spcgrp:
<
WORD
>
)#
guard-band
{<
0-37000000
> |
<
0-60000000
>}
where:
WORD
is the spectrum group name.
0-37000000
is the guard band separation size expressed in Hertz (Hz) for
DOCSIS. The default guard band is 0 Hz.
0-60000000
is the guard band separation size expressed in Hertz (Hz) for
Euro-DOCSIS. The default guard band is 0 Hz.
Reviewing the Spectrum Group that You Created
Use the
show cable spectrum-group
command in Global Configuration mode to
view the spectrum group that you created:
MOT(config)#
show cable spectrum-group
[<
WORD
>]
where:
WORD
is the spectrum group name.
shows sample output for the
show cable spectrum-group
command:
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