EXFO FTB-8510B Guia Del Usuario página 1038

PDH Tabs
E3/34M 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 E3 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.751 Bit 12 is reserved for national use. Possible values are 0 and 1. The
default setting is 1.
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FTB-8100 Series Transport Blazer