Avaya S8700 Series, Maintenance Manual

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UDS1-BD (UDS1 Interface Circuit Pack)
Issue 1 May 2002 8-1757 555-233-143
Yellow Alarm Inquiry Test (#141)
Receiving a Yellow alarm from a remote DS1 endpoint indicates that the remote
DS1 endpoint has an out-of-frame condition. The Yellow Alarm Inquiry test is
used to determine whether the remote DS1 endpoint is transmitting a Yellow
alarm. The UDS1 Interface circuit pack takes 500 msec to recognize and report a
Yellow alarm, and another 500 msec to recognize and report that the alarm’s
condition is cleared.
When the UDS1 Interface circuit pack detects a Yellow alarm from the remote
DS1 endpoint, it sends a YELLOW-ALARM uplink message to the maintenance
software. After the maintenance software receives the YELLOW-ALARM
message, the Yellow Alarm Inquiry test is run to confirm the Yellow alarm. Once
the alarm is confirmed, the maintenance software places every trunk or port on
the circuit pack into the out-of-service state. The Inquiry test runs every 10
minutes until the Yellow alarm is cleared.
When the Yellow alarm is cleared, the maintenance software restores every trunk
or port on the UDS1 Interface circuit pack back to its previous service state before
the alarm was raised.
This Yellow alarm corresponds to the yellow F2 state documented in CCITT
Recommendation I.431.
Remote Multiframe Alarm
An RMA (Remote Multiframe Alarm) indicates that the remote DS1 endpoint is in
a Loss of Multiframe Alarm condition while the UDS1 Interface circuit pack is
administered using the DMI-BOS common-channel signaling. The RMA is
handled as a Yellow alarm.
Yellow F5 Fault Alarm
For 32-channel E1 operation with CRC4 on, the F5 fault state is defined as a fault
in the user-network interface, specifically in the direction from the user (PBX) to
the network. Refer to CCITT recommendation I.431.