Chapter 4. Status4-2 T3SU 300 User Manual 61200217L1-1Network StateThis field displays the current chart:Alarm StateThis field displays the current alarm condition of the T3SU 300.Possible conditions are given in the following chart:Condition DescriptionNormal The T3SU 300 is ready to pass data.Alarm The unit is currently receiving an alarm indication. Seethe A LARM S TATE field in this menu to determine thealarm type.In Test The unit is currently in test mode. The D IAGNOSTICSmenu provides information on test type.Condition DescriptionNormal No alarms are currently being received.Yellow The unit is transmitting a yellow alarm from thenetwork. This alarm is a signal sent back toward thesource of a failed transmit circuit. The X-bits (X1 andX2) are set to zero.LOS (Red Alarm) The unit has lost the Rx signal.Blue (AIS) The unit is receiving a blue alarm condition from thenetwork. A blue alarm occurs when consecutive1010s are received in the information bits. Thisindicates that there is a transmission fault locatedeither at or upstream from the transmitting terminal.OOF The unit detects an out of frame condition from thenetwork.Idle The unit detects an idle sequence from the network.Service is immediately available for use.
