ADTRAN 4200659L2 User Manual
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Chapter 4. Status

LOS/AIS – indicates that the clock source is not valid due to an LOS or AIS condition.

FAIL – indicates that an internal hardware failure on the unit prevents the clock source from being used.

UNAVAILABLE – indicates that the user has specified a T1/E1 port to be used as an external clock source, but the port has not been enabled.

VT/PORT STATE

This field displays the current alarm condition of the VTs/ports.

Possible conditions are given in the following chart:

VT/Port State

Alarm

Description

 

 

OFF

VT in 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 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).

 

 

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Chapter 4. Status

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.

 

 

VT-AIS

(VT Path Alarm Indication Signal)

 

The unit is receiving a VT path alarm indication

 

signal. VT-PathAIS 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-PathAIS failure is declared when the

 

VT-PathAIS 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-RFIis declared when the

 

incoming VT path remote defect indication (VT-

 

RDI, “1” in bit 4 of the VT-PathOverhead 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”.

 

 

VT-UEQ

(VT Path Unequipped)

 

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.

 

 

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Chapter 4. Status

ACKNOWLEDGE ALARMS (ACO)

This selection allows you to remotely turn off an active alarm. It is the software equivalent of the ACO button (described in the sectionACO Buttons on page 2-12).

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