Specifications

7-40
Reference Guide
Model No.
Running Head
WAN Card User Screens and Settings WAN Card
The following notification procedure is followed:
1. A Loss of Signal, Loss of Frame, Error Rate Exceeded, or AIS failure of the transmit
leg of W1-1(A) occurs between Device 1 and SYS 1.
2. SYS 1 detects the failure on the receive leg and declares an alarm for W1-1(A).
3. SYS 1 sets the A Bit (Yellow Alarm) in the transmit leg of W1-1(A). Device 1 detects
this condition and knows not to use W1-1(A).
4. SYS 1(C) sends an alarm message to SYS 2 (C1), telling it that W1-1(A) is either in a
CGA_RED or AIS alarm.
5. SYS 2 sets the transmit leg of W3-1(A1) into AIS (CGA_RED). Device 2 detects this
condition and knows not to use W3-1(A1).
When the original failure is corrected, the alarm is also cleared for downstream tributaries.