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DS1-BD (DS1 Interface Circuit Pack)
Issue 5 October 2002
1101
555-233-119
Yellow Alarm Inquiry Test (#141)
Receiving a Yellow alarm from 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 DS1 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 DS1 Interface circuit pack detects a Yellow alarm from the remote DS1
endpoint, it will send 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 on the
circuit pack into the out-of-service state. The Inquiry Test will be run every 10
minutes until the Yellow alarm is cleared.
When the Yellow alarm is cleared, the maintenance software restores all trunks on
the DS1 Interface circuit pack back to their previous service state before the
Yellow alarm is 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 DS1
Interface circuit pack is administered using the DMI-BOS common channel
signaling. The RMA is handled as a Yellow alarm.
Yellow F5 State 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