EXFO FTB/IQS-88000 Series Power Blazer for FTB-2/2Pro/500/IQS-600 - Manual (Page 301)

Test Results
Power Blazer 289
Alarms/Errors
OTL
Alarms

LOL (Loss of Lane Alignment)
RX: Multilane alignment process is in the out-of-alignment (OLA) state
for 3 ms.

LOF (Loss of Frame)
RX: OOF is present for at least 3 ms.

OOF (Out-Of-Frame)
RX: Any byte of the FAS (bytes 3, 4, and 5) is in error for at least 5
consecutive frames.

LOR (Loss Of Recovery)
RX: When OOR persists at least 3 ms.

OOR (Out-Of-Recovery)
RX: While in In-recovery (IR) state, in five consecutive 16320 byte
periods each of the received logical lane marker (LLM) is different
from the accepted LLM value.

Exc. Skew (Excessive Skew)
RX: The skew exceeds the defined threshold (see Skew Alarm
Threshold (bits) on page 416).
Errors

FAS (Frame Alignment Signal)
RX: The FAS bits are in error.

Inv. Marker (Invalid Marker)
RX: Errors are detected in the 66-bit block alignment marker.