EXFO FTB-8510B Guia Del Usuario página 1034

PDH Tabs
E2/8M RX
Alarm Analysis
Note: Only AIS is available when the framing is set to Unframed.
LOF (Loss Of Frame): The LOF alarm indicates that four consecutive
incorrect frame alignment signals have been received.
RAI (Remote Alarm Indication): The RAI alarm is declared when bit 11
of a framed E2 is set to "1".
AIS (Alarm Indication Signal): The AIS alarm is declared when an
unframed all-ones signal is received.
Spare Bits
Note: Spare Bits are not available when Framing is set to Unframed.
G.742 Bit 12 represent Bit 12 from Timeslot 1, 2, 3 and 4 respectively.
Possible values are 0 and 1.
384
FTB-8100 Series Transport Blazer