Cable Modem Downstream Frequency Override During Ranging; Testing Rf Carrier Modulation - Motorola BSR 2000 Configuration And Management Manual

BSR 2000 Configuration and Management Guide
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:
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
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.

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:
Use the no cable downstream carrier-only command if you need to disable the
downstream carrier-only function.
6-52
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
0-0 is the downstream port number.
MGBI
Release 1.0
526360-001-00 Rev. B