Acterna ANT-5 - PDH Anomalies and Defects

Appendix D – SDH and PDH information
Acterna ANT-5 Page 135
Tandem Connection Monitoring
HP-IEC HP incoming error count N1
HP-ODI HP outgoing defect indicator N1
HP-OEI HP outgoing error indicator N1
HP-TC-AIS TC alarm indication signal N1
HP-TC-LTC Loss of tandem connection (i.e. loss of FAS) N1
HP-TC-RDI TC remote defect indication N1
HP-TC-REI TC remote error indication N1
HP-TC-UNEQ TC unequipped (i.e. not set up) N1
LP-BIP LO path error monitoring (VC-12) N2
LP-IEC LP incoming error count N1*, N2*
LP-ODI LP outgoing defect indicator N1*, N2*
LP-OEI LP outgoing error indicator N1*, N2*
LP-TC-AIS TC alarm indication signal N1*, N2*
LP-TC-LTC Loss of tandem connection (i.e. loss of FAS) N1*, N2*
LP-TC-RDI TC remote defect indication N1*, N2*
LP-TC-REI TC remote error indication N1*, N2*
LP-TC-UNEQ TC unequipped (i.e. not set up) N1*, N2*
*N2 in VC-12, N1 in VC-3
12.5 PDH Anomalies and Defects
The following PDH Anomalies and Defects may be detected inside the SDH structure
and at the line interface.
DS3 Defect Description
LOS Loss of Signal
LOF Loss of Frame
OOF Out of Frame
AIS Alarm Indication Signal (1010 payload)
IDLE DS3 Idle (1100 payload)
YELLOW Yellow alarm (Far End Alarm)
LSS Loss of Sequence Synchronisation