Appendix D. System MessagesD-2 TSU 120 User Manual 61202129L1-1DSX-1 (PBX) InterfaceThe following messages indicate a condition on the Base DSX-1(PBX) interface:Status MessagesNetwork Interface (NI)TR-08 alarm messages appearing in the alarm or historylog have been received from the far end. If the NI detectsone of the aove conditions, it will send the appropriatealarm (if enabled) to the far end but no message will ap-pear in the alarm or history log.Red Alarm Not able to frame data coming to the DSX-1interface; sometimes referred to as out-of-frame (OOF)Yellow Alarm Remote alarm indicator (RAI) beingreceived by the DSX-1 interfaceBlue Alarm Receiving unframed all 1s at the DSX-1interface [alarm indicator signal (AIS)]Loss of Signal No signal detected by the DSX-1 interfacePayload On Payload loopback activatedLine On Loopback offLoopback Off All loopbacks deactivatedFactory Restore Factory setting restoredPower On Unit powered onSelf-Test Internal self-test performedTR-08 DL Down* TR-08 data link is downTR-08 DL Up* TR-08 data link is upMinor Alarm* Loss of sync, carrier los, BPV thresholdexceded, or data link failureMajor Alarm* Conditions for a minor alarm have contin-ued for greater than 2.5 seconds
