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Chapter 5. Statistics
61200659L1-1 MX2800 STS-1 User Manual 5-11
The following alarm counts are provided in this menu:
Condition Description
LOP The number of times the unit has failed to find a
valid VT pointer.
AIS The number of times the unit has received a path
alarm indication signal. VT-Path AIS is defined as
all ones in bytes V1, V2, V3, and V4 as well as all
ones in the entire VT synchronous payload
envelope. A VT-Path AIS failure is declared when
the VT-Path AIS defect persists for 2.5 +/- 0.5
seconds.
RDI Number of times the unit has received a VT path
remote defect indication. VT-RFI is declared
when the incoming VT path RDI lasts for 2.5 +/-
0.5 seconds.
RFI Number of times the unit has received a VT path
remote failure indication. VT-RFI is declared
when the incoming VT path RFI lasts for 2.5 +/-
0.5 seconds.
SLM Number of times the unit has detected a SLM
alarm condition from the VT path. A received
signal label is mismatched if it does not equal the
locally provisioned value or the value “equipped
non-specific”.
UEQ Number of times the unit has detected a UEQ
alarm condition from the VT path. The VT path is
not provisioned. Byte V5 of the STS path
overhead is set to zero.
The count given reflects the number of times the alarm or state has
occurred (rather than the number of seconds the alarm was active).