Extreme Networks BlackDiamond 6800, Installation And User Manual

Page: 59 / 110

Asynchronous Transfer Mode (ATM) Module Installation and User Guide 3-17
Configuring and Monitoring SONET
Configuring the Signal Fail Threshold
A Signal Failure (SF) event is generated if the bit error rate (BER) for the SONET line
exceeds the configured threshold. An SF event brings the port down.
To configure the Signal Fail threshold for the specified ATM port, use the following
command:
config sonet threshold signal fail <error_rate> ports <portlist>
The
error_rate
parameter is an integer in the range from 3 to 5, where the SF BER is
10
-error_rate
. The default value of the
error_rate
parameter is 5, which equates to an SF
bit error rate of 10 -5 , or 1 per hundred thousand.
The following command example sets the Signal Fail threshold value to 3 for port 1 of
the ATM module installed in slot 8 of the BlackDiamond switch.
config sonet threshold signal fail 3 ports 8:1
You might set the signal fail threshold to a value different than the default value
of 5 if your particular application has a very low tolerance for errors. In general,
you should not change the default setting unless you are an expert and have a
specific reason for the change.
Configuring the Signal Degrade Threshold
A Signal Degrade (SD) event is generated if the BER for the SONET line exceeds the
configured Signal Degrade threshold.
To configure the Signal Degrade threshold for the specified ATM port, use the following
command:
config sonet threshold signal degrade <error_rate> ports <portlist>
The
error_rate
parameter is an integer in the range from 5 to 9, where the SD bit error
rate is 10
-error_rate
. The default value of the
error_rate
parameter is 6, which equates to
an SD bit error rate of 10 -6 , or 1 per million.
The following command example sets the Signal Degrade threshold value to 8 for port 1
of the ATM module installed in slot 8 of the BlackDiamond switch.
config sonet threshold signal degrade 8 ports 8:1