Chapter 6: Packet-over-SONET Configuration Guide

To manage the working and protecting PoS interfaces, enter the following commands in Configure mode:

Prevent a working interface from switching to a

sonet set <port> protection-switch

protecting port. This command can only be applied

lockoutprot

 

to a port configured as a protecting port.

 

 

 

 

 

Force a switch to the specified port. This command

sonet set <port>

protection-switch

can be applied to either the working or protecting

forced

 

port.

 

 

 

 

 

Manually switch the line to the specified port. This

sonet set <port>

protection-switch

command can be applied to either the working or

manual

 

protecting port.

 

 

 

 

 

Note: You can only specify one option, lockoutprot, forced or manual, for a port. Also, an option can be applied to either the working port or the protecting port, but not both working and protecting ports at the same time.

To return the circuit to the working interface after the working interface becomes available, enter the following commands in Configure mode:

Enable automatic switchover from the protecting

sonet set <port> reverting

interface to the working interface after the working

revertivenonrevertive

interface becomes available. This command can only

 

be applied to a protecting port.

 

 

 

Sets the number of minutes after the working

sonet set <port> WTR-timer <minutes>

interface becomes available that automatic

 

switchover from the protecting interface to the

 

working interface takes place. The default value is 5

 

minutes.

 

 

 

Specifying Bit Error Rate Thresholds

If the bit error rate (BER) on the working line exceeds one of the configured thresholds, the receiver automatically switches over to the protecting line.

BER is calculated with the following:

BER = errored bits received/total bits received

The default BER thresholds are:

Signal degrade BER threshold of 10-6(1 out of 1,000,000 bits transmitted is in error). Signal degrade is associated with a “soft” failure. Signal degrade is determined when the BER exceeds the configured rate.

SmartSwitch Router User Reference Manual

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Cabletron Systems 9032578-05 manual Specifying Bit Error Rate Thresholds