Table of Contents
Advertisement
Section 4, Status
VT/Port State
4.
VT/PORT STATE
This field displays the current alarm condition of the VTs/ports. Possible conditions are given in
Alarm
Meaning
OFF
OK
LOS
T1/E1 Loss of
Signal
CAIS
Carrier AIS
LAIS
Loop Side AIS
XCV
T1/E1 Exces-
sive Code
Violations
VT-LOP
VT Path Loss
of Pointer
VT-AIS
VT Path
Alarm Indica-
tion Signal
VT-RFI
VT Path
Remote Fail-
ure Indication
VT-SLM
VT Path Sig-
nal Label
Mismatch
VT-UEQ
VT Path
Unequipped
TST
4-6
Table 4-7. VT/Port State
Description
VT is unequipped and T1/E1 port is disabled.
VT/Port is in a normal state.
The unit has lost the receive signal on a T1/E1.
The T1 is receiving all ones from the STS side of the network.
The T1 is receiving all ones from the DSX-1 interface.
The controller card is receiving excessive code violations, exceeding the thresh-
old set by the user (Refer to
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.
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.
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.
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).
The controller card detects that the VT path is unequipped (VT label is zero).
The VT/Port is in test mode.
MX2800 STS-1 User Manual
XCV Threshold
on page 3-16).
Table
4-7.
61204659L1-1A
Advertisement
Table of Contents
