Motorola BSR 2000, Руководство по настройке и управлению

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BSR 2000 Configuration and Management Guide Release 1.0
6-148 MGBI 526360-001-00 Rev. B
WORD
is the spectrum group name.
1-1000
is the error rate as a fraction of 1000.
For example, an error rate of 1 implies 0.1 percent or an error rate of 1000 implies 100
percent.
Configuring the Spectrum Hopping Flap Threshold
A frequency hopping flap threshold is configured as a criteria to apply the hopping
rules in instances when one or a minimal number of cable modems (CMs) lose their
connection with the BSR (Flap).
The frequency hopping flap threshold is determined by the percentage of CMs that
lose their connectivity. If the flap threshold is configured, the spectrum manager
periodically scans the flap-list table of the member channels to compute the flap rate
during the scan interval. If the flap rate exceeds the threshold, it triggers spectrum
hopping for the affected channel.
This frequency hopping threshold is activated with a value of 0 percent by default to
prevent the unnecessary triggering of a hopping action. For example, if the
downstream cable is disconnected or the downstream frequency is changed, these
actions would cause all CMs on the network to flap.
Use the hop threshold flap command in Cable Spectrum Group mode to set a value
that triggers when a greater than a set percentage of CMs lose their connectivity:
MOT(config-spcgrp:
<
WORD
>
)#
hop threshold flap {<
1-100
>}
where:
WORD
is the spectrum group name.
1-100
is the percentage of CMs from 1 to 100 that lose connectivity on the
network.
If an existing percentage other than zero is set, and you need to take some action that
causes CMs to flap (such as changing the downstream frequency), issue the
no hop
threshold flap command in Cable Spectrum Group mode to deactivate the frequency
hopping threshold before taking the action:
MOT(config-spcgrp:
<
WORD
>
)#
no hop threshold flap <
1-100
>
where:
WORD
is the spectrum group name.
1-100
is the set percentage of CMs that lose their connectivity on the network.