ADTRAN 4200659L1 - Manual (Page 68)

Chapter 3. Configuration
3-22 MX2800 STS-1 User Manual 61200659L1-1
Alarm Description
VT-RFI (VT Path Remote Failure Indication)
The unit is receiving a VT path remote failure
indication. VT-RFI is declared when the
incoming VT path remote defect indication (VT-
RDI, “1” in bit 4 of the VT-Path Overhead byte
(V5) in five contiguous frames) lasts for
2.5 +/- 0.5 seconds.
VT-SLM (VT Path Signal Label Mismatch)
A received signal label is mismatched if it does
not equal the locally provisioned value or the
value “equipped non-specific”.
VT-UEQ (VT Path Unequipped)
The VT path is not provisioned. Byte V5 of the
STS path overhead is set to zero.