Chapter 4. Status

Condition

Description

 

 

Normal

No alarms are currently being received.

 

 

RAI (Yellow

The unit is transmitting a yellow alarm from the

Alarm)

network. This alarm is a signal sent back toward

 

the source of a failed transmit circuit. The X-bits

 

(X1 and X2) are set to zero.

 

 

LOS (Red

The unit has lost the Rx signal.

Alarm)

 

 

 

AIS (Blue

The unit is receiving a blue alarm condition from

Alarm)

the network. A blue alarm occurs when consecu-

 

tive 1010s are received in the information bits.

 

This indicates that there is a transmission fault lo-

 

cated either at or upstream from the transmitting

 

terminal.

 

 

OOF

The unit detects an out of frame condition from the

 

network.

 

 

Idle

The unit detects an idle sequence from the net-

 

work. Service is immediately available for use.

 

 

Eqpt Fail (SA)

The network has signaled a service affecting

 

equipment failure condition.

 

 

Eqpt Fail

The network has signaled a non-service affecting

(NSA)

equipment failure condition.

 

 

Com Eqpt Fail

The network has signaled a non-service affecting

(NSA)

common equipment failure condition.

 

 

Unknown

The T3SU 300 is unable to determine the state of

 

the network or the remote unit.

 

 

4-4

T3SU 300 User Manual

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ADTRAN T3SU 300 user manual Com Eqpt Fail Network has signaled a non-service affecting