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Chapter 4. Status
4-4 T3SU 300 User Manual 61200217L1-1
Condition Description
Normal No alarms are currently being received.
RAI (Yellow
Alarm)
The unit is transmitting a yellow alarm from the
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
Alarm)
The unit has lost the Rx signal.
AIS (Blue
Alarm)
The unit is receiving a blue alarm condition from
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
(NSA)
The network has signaled a non-service affecting
equipment failure condition.
Com Eqpt Fail
(NSA)
The network has signaled a non-service affecting
common equipment failure condition.
Unknown The T3SU 300 is unable to determine the state of
the network or the remote unit.