User guide

Packet Over SONET Module Installation and User Guide 3-15
Configuring and Monitoring SONET Ports
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. If APS is enabled on the port, an SD event
initiates a line switch.
To configure the Signal Degrade threshold for the specified SONET 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 PoS module installed in slot 8 of the BlackDiamond switch.
config sonet threshold signal degrade 8 ports 8:1
You might set the signal degrade threshold to a different value than the default
value of 6 depending on your particular application’s 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 Section Trace Identifier
Section trace is a maintenance feature of SONET. One byte of the Section Overhead
associated with each SONET frame is used to carry information identifying the
transmitting equipment.
To configure the Section Trace identifier for the specified SONET port, use the following
command:
config sonet trace section [<id_byte> | string <id_string>] ports <portlist>
In this command, the Section Trace identifier can take one of two forms: an ID byte
(
id_byte) or an ID string (id_string).
The
id_byte parameter is an integer in the range from 1 to 255, with a default value
of 1. This parameter applies only when SONET framing is configured, in which case,
the configured
id_byte value is transmitted in each SONET frame.