Adtran 4175043L2 Manual Do Utilizador
Chapter 3. Configuration
61200659L1-1
MX2800 STS-1 User Manual
3-21
VT/Port Alarms
Alarm
Description
LOS
(T1/E1 Loss of Signal)
The unit has lost the receive signal on a T1/E1.
The unit has lost the receive signal on a T1/E1.
CAIS
(Carrier Side AIS)
The T1 is receiving all ones from the STS side
of the network.
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.
The T1 is receiving all ones from the DSX-1
interface.
XCV
(T1/E1 Excessive Code Violations)
The controller card is receiving excessive code
violations, exceeding the threshold set by the
user (see XCV Threshold on page 3-12).
The controller card is receiving excessive code
violations, exceeding the threshold set by the
user (see XCV Threshold on page 3-12).
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 concatenation 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 concatenation 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.