EXFO FTB-800 Series for FTB-1 - Manual (Page 409)

Test Functions
NetBlazer 399
FDL - Performance Report Message
Received Messages

Event Counts lists received PRM bit event counts.See PRM Bit Events
below.

Report Content lists received performance information. See
Performance Information below.

Circuit indicates the selected circuit type: CI to Network or
Network to CI.

Valid Event Count indicates the number of valid PRM messages
received.

Link Activity, see page 396 for more information.

PRM Bit Events table, available when the Event Counts button is
selected, reports the count of the detected valid PRM bit events.
G1: CRC = 1
G2: 1 < CRC  5
G3: 5 < CRC 10
G4: 10 < CRC  100
G5: 100 < CRC 319
G6: CRC  320
SE: Severely errored framing  1
FE: Frame sync. bit error  1
LV: Line Code Violation  1
LB: Payload loopback activated
SL: Slip  1