Appendix D. System MessagesD-2 TSU 600 User Manual 61202076L1-1Status Messages: Network Interface (NI)*TR-08 alarm messages appearing in the alarm or history log havebeen received from the far end. If the NI detects one of the aboveconditions, it will send the appropriate alarm (if enabled) to the far endbut no message will appear in the alarm or history log.Message DescriptionPayload 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 loss, BPV thresholdexceeded, or data link failure.Major Alarm* Conditions for a minor alarm have contin-ued for greater than 2.5 seconds.
