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UDS1-BD (UDS1 Interface Circuit Pack)
Issue 5 October 2002
1803
555-233-119
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 500 msec to recognize and report that a Yellow alarm 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 Yellow alarm is confirmed, the maintenance software places all trunks or ports
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 all trunks or
ports on the UDS1 Interface circuit pack back to their previous service state
before the Yellow alarm was raised.
This Yellow alarm corresponds to the yellow F2 state documented in CCITT
Recommendation I.431.
Remote Multiframe Alarm
Remote Multiframe Alarm (RMA) 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.