BSR 2000 Configuration and Management Guide
Release 1.0
6-52
MGBI
526360-001-00 Rev. B
Cable Modem Downstream Frequency Override During
Ranging
The Cable Modem Downstream Frequency Override helps the BSR to accelerate
ranging in an RF environment where all downstream signals are seen by all cable
modems but upstream signals are wired discretely. This is accomplished by sending
an RNG-RSP message with a downstream frequency override that tells a specific
cable modem to move to a specific downstream channel. By default, this feature is
disabled.
The Cable Modem Downstream Frequency Override feature is useful if the network is
configured as follows:
■
there are multiple downstream channels tied together on the same RF pipe
■
all upstream channels must be physically separated
■
the same upstream parameters (frequency, modulation, etc.) must be set for all
physical upstream channels
Use the following CLI commands, in Global Configuration Mode, to enable or
disable the Cable Modem Downstream Frequency Override feature:
MOT
(config)
#
cable multi-ds-override
MOT
(config)
#
no cable multi-ds-override
Testing RF Carrier Modulation
The downstream carrier-only function is disabled by default and is used for testing
purposes only to control downstream output. Use the
cable downstream carrier-only
command in Interface Configuration mode to optionally enable this test function.
MOT
(config-if)#
cable downstream
<
0-0
>
carrier-only
where:
0-0
is the downstream port number.
Use the
no cable downstream carrier-only
command if you need to disable the
downstream carrier-only function.
Note:
Depending on cable modem software and hardware revisions, this
feature will not be effective if a cable modem does not support the
downstream frequency override in the RNG-RSP message.
Содержание BSR 2000
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