EXFO FTB-800 Series for FTB-1 - Manual (Page 281)

Test Results
NetBlazer 271
Alarms/Errors

LOF (Loss of Frame)
RX: OOF is present for at least 3 ms.
TX: Generates error in all FAS bits continuously.

LOM (Loss Of Multiframe)
RX: OOM is present for at least 3 ms
TX: Generates error in MFAS bits continuously.

OOF (Out-Of-Frame)
RX: FAS (bytes 3, 4, and 5) are in error for at least 5 consecutive OTU
frames.
TX: Generates error in all FAS bits for 5 consecutive OTU frames.

OOM (Out-Of-Multiframe)
RX: MFAS are in error for at least 5 consecutive OTU frames.
TX: Generates error in multiframe number for 5 consecutive OTU
frames.

TIM (Trace Identifier Mismatch)
RX: Expected SM SAPI and/or SM DAPI do not match the received SM
SAPI and/or DAPI for at least 3 consecutive TTI. This alarm is only
available when the Enable TIM SAPI OTU-TIM and/or DAPI OTU-TIM
check boxes are selected from page 240.