Filter
Top Products
Chapter 4. Status
61200659L1-1 MX2800 STS-1 User Manual 4-11
Alarm Description (cont’d)
VT-LOP (VT Path Loss of Pointer)
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 concantenation indicator.
A VT LOP failure is declared when the VT LOP
defect persists for 2.5 +/- 0.5 seconds.
VT-AIS (VT Path Alarm Indication Signal)
The unit is receiving a VT path alarm indication
signal. VT-Path AIS is specified 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.
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.
TST The VT/Port is in test mode.