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Chapter 3. Configuration
61200659L1-1 MX2800 STS-1 User Manual 3-19
STS-1 Alarms
Alarm Description
LOS (Loss of Signal)
The unit has lost the network receive signal.
LOF (Loss of Framing)
The unit detects a framing loss from the
network.
LOP (Loss of Pointer)
The unit is unable to detect a valid pointer in the
receive signal.
LOMF (Loss of Multiframe)
The unit detects loss of H4 multiframe from the
network.
AIS-L (Line Alarm Indication Signal)
The unit is receiving a line alarm indication
signal. The Section Terminating Equipment
generates AIS-L after detecting LOS or LOF.
AIS-P (Path Alarm Indication Signal)
The unit is receiving a path alarm indication
signal. AIS-P is defined as all ones in bytes H1,
H2, and H3 as well as all ones in the entire STS
synchronous payload envelope.
RFI-L (Line Remote Failure Indication)
The unit is receiving a line remote failure
indication. RFI-L is declared when the incoming
line remote defect indication (RDI-L, “110”
pattern in bits 6, 7, and 8 of the K2 line overhead
byte) lasts for 2.5 +/- 0.5 seconds.
RFI-P (Path Remote Failure Indication)
The unit is receiving a path remote failure
indication. RFI-P is declared when the incoming
path remote defect indication (RDI-P, “1” in bit 5
of the G1 path overhead byte for contiguous
frames) lasts for 2.5 +/- 0.5 seconds.