Chapter 3. Configuration

VT/Port Alarms

Alarm

Description

 

 

LOS

(T1/E1 Loss of Signal)

 

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.

 

 

LAIS

(Loop Side AIS)

 

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).

 

 

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.

 

 

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.

 

 

61200659L1-1

MX2800 STS-1 User Manual

3-21

Page 66 Page 68
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ADTRAN 4200659L6, 4200659L1, 4175043L2, 4200659L5, 4200659L8, 4200659L2, 4200659L7, 4200659L3 VT/Port Alarms Description, Vt-Lop
Page 66 Page 68

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