ADTRAN MX2800 STS-1 - Vt;Port State; Table 4-7. Vt;Port State

4-6 61204659L1-1A
Section 4, Status MX2800 STS-1 User Manual
VT/Port State
4. VT/PORT STATE
This field displays the current alarm condition of the VTs/ports. Possible conditions are given in Table 4-7.
Table 4-7. VT/Port State
Alarm Meaning Description
OFF VT is unequipped and T1/E1 port is disabled.
OK VT/Port is in a normal state.
LOS T1/E1 Loss of
Signal
The unit has lost the receive signal on a T1/E1.
CAIS Carrier AIS The T1 is receiving all ones from the STS side of the network.
LAIS Loop Side AIS The T1 is receiving all ones from the DSX-1 interface.
XCV T1/E1 Exces-
sive Code
Violations
The controller card is receiving excessive code violations, exceeding the thresh-
old set by the user (Refer to XCV Threshold on page 3-16).
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 NDF set to “1001” without a valid concatenation indicator. A
VT-LOP failure is declared when the VT-LOP defect persists for 2.5 ± 0.5 sec-
onds.
VT-AIS VT Path
Alarm Indica-
tion 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 syn-
chronous 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 Fail-
ure Indication
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 sec-
onds.
VT-SLM VT Path Sig-
nal Label
Mismatch
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).
VT-UEQ VT Path
Unequipped
The controller card detects that the VT path is unequipped (VT label is zero).
TST The VT/Port is in test mode.