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Section 3, Configuration
System Management
STS-1 Alarms
Table 3-9
describes the STS-1 Alarm indications.
Alarm
Meaning
LOS*
Loss of Signal
LOF*
Loss of Framing
LOP*
Loss of Pointer
LOMF*
Loss of
Multiframe
AIS-L*
Line Alarm
Indication
Signal
AIS-P*
Path Alarm
Indication
Signal
RFI-L*
Line Remote
Failure
Indication
RFI-P*
Path Remote
Failure
Indication
SLM-P*
Path Signal
Level Mismatch
UEQ-P*
Path
Unequipped
TLOS*
Transmit Loss
of Signal
*Critical Alarm
3-32
Table 3-9. STS-1 Alarm Descriptions
Description
The unit has lost the network receive signal.
The unit detects a framing loss from the network.
The unit is unable to detect a valid pointer in the receive signal.
The unit detects loss of H4 multiframe from the network.
The unit is receiving a line alarm indication signal. The Section Terminating
Equipment generates AIS-L after detecting LOS or LOF.
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.
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.
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 over-
head byte for contiguous frames) lasts for 2.5 ± 0.5 seconds.
A received signal label is mismatched if the received C2 byte does not indicate
unequipped (0) or "VT structured payload" (2).
The path is unequipped if it is not provisioned. Byte C2 of the STS path overhead
is set to zero.
The transmitter has failed.
MX2800 STS-1 User Manual
61204659L1-1A
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