Справочник Пользователя для Adtran 1200287L1
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.
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.
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.
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”.
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.
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.