Appendix D. System Messages
DSX-1 (PBX) Interface
The following messages indicate a condition on the Base
Red Alarm | Not able to frame data coming to the |
| interface; sometimes referred to as |
| frame (OOF) |
Yellow Alarm | Remote alarm indicator (RAI) being |
| received by the |
Blue Alarm | Receiving unframed all 1s at the |
| interface [alarm indicator signal (AIS)] |
Loss of Signal | No signal detected by the |
Status Messages
Network Interface (NI)
Payload On | Payload loopback activated |
Line On | Loopback off |
Loopback Off | All loopbacks deactivated |
Factory Restore | Factory setting restored |
Power On | Unit powered on |
Internal | |
Minor Alarm* | Loss of sync, carrier los, BPV threshold |
| exceded, or data link failure |
Major Alarm* | Conditions for a minor alarm have contin- |
| ued for greater than 2.5 seconds |
TSU 120 User Manual |