Verilink HDM 2180 (880-503048-001) Product Manual - Manual (Page 76)

Troubleshooting
6-8 Verilink HDM 2180 User Manual
Far-End Alarms The following far-end alarms are detected and reported:
FEBE Far end block error
FEAC DS3 equipment failure (SA)
FEAC DS3 LOS/HBER
FEAC DS3 OOF
FEAC DS3 AIS received
FEAC DS3 IDLE received
FEAC DS3 equipment failure (NSA)
Common Equipment Failure (NSA)