MX2800 STS-1 User Manual Statistics, Section 5
Local VT Statistics
61204659L1-1A 5-9
Figure 5-11. Local VT-LOP Alarm Count Screen (24 Hour History)
Table 5-2 describes the alarm counts shown on the VT Statistics screens.
NOTE
The count given reflects the number of times the alarm or state has
occurred (rather than the number of seconds the alarm was active).
Table 5-2. Alarm Count Descriptions
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 The controller card is detecting a signal label mismatch in the VT path. A
received signal label is mismatched if the VT label does not indicate
“unequipped” (0) or “asynchronously mapped” (2).
UEQ The controller card detects that the VT path is unequipped (VT label is zero).
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