EXFO FTB-800 Series for FTB-1 - Manual (Page 285)

Test Results
NetBlazer 275
Alarms/Errors
QoS Metrics
Note: Only available with Traffic Gen & Mon test application.
Errors

Frame Loss
RX: A sequence number is missing in the received frames.

Out-of-Seq. (Out-of-Sequence)
RX: The received frame sequence number is either smaller than the
expected frame sequence number or is a duplicate number.