Riverstone Networks WICT1-12 - Manual (Page 165)

Riverstone Networks RS Switch Router User Guide Release 8.0 9-5
Packet-over-SONET Configuration Guide Specifying Bit Error Rate Thresholds
To return the circuit to the working interface after the working interface becomes available, enter the following
commands in Configure mode:
9.4 SPECIFYING BIT ERROR RATE THRESHOLDS
If the bit error rate (BER) on the working line exceeds that 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.
• Signal failure BER threshold of 10 -3 (1 out of 1,000 bits transmitted is in error). Signal failure is
associated with a “hard” failure. Signal fail is determined when any of the following conditions are
detected: loss of signal (LOS), loss of frame (LOF), line alarm indication bridge and selector signal
(AIS-L), or the BER threshold exceeds the configured rate.
To specify different BER thresholds, enter the following commands in Enable mode:
Enable automatic switchover from the protecting interface
to the working interface after the working interface becomes
available. This command can only be applied to a protecting
port.
sonet set
<port>
revertive on|off
Sets the number of minutes after the working interface
becomes available that automatic switchover from the
protecting interface to the working interface takes place.
The default value is 5 minutes.
sonet set
<port>
WTR-timer <minutes>
Specify signal degrade BER
threshold.
sonet set
<port>
sd-ber
<number>
Specify signal failure BER
threshold.
sonet set
<port>
sf-ber
<number>