Troubleshooting guide

Section 8, User Interface Guide - TAP-100, MX2820 Troubleshooting Guide
61186003L1-1D 8-19
STS-1 VT/Port Alarm Condition Descriptions
Table 8-15 provides VT/Port Alarm Condition descriptions.
Table 8-15. VT/Port Alarm Condition Descriptions
VT/Port Alarm Condition Description Severity Level
LOP-V A VT LOP defect is declared when either a valid pointer is
not detected in eight consecutive VT superframes, or
when eight consecutive VT superframes are detected
with the NDF set to “1001” without a valid concatenation
indicator. A VT LOP is declared when the VT LOP defect
persists for 2.5 ±0.5 seconds
Major
AIS-V The unit is receiving a VT Path alarm indication signal
(VT-Path AIS-P is defined as all ones in bytes V1 and V2,
as well as all ones in the entire VT synchronous payload
envelope). A VAIS failure is declared when the defect per
-
sists for 2.5 ±0.5 seconds
Alert
RFI-V The unit is receiving a VT Path remote failure indication
(RFI-V is declared when the incoming VT Path remote
defect indication [VTRDI, “1” in bit 4 of the VT-Path over
-
head byte, V5, in five contiguous frames] lasts for 2.5
±0.5 seconds
Alert
SLM-V A received signal label is mismatched if it does no equal
the locally provisioned value or the value “equipped non-
specific”
Major
UNEQ-V The received VT path is unequipped if it is not provi-
sioned (Byte V5 of the received VT path overhead is set to
zero)
Major