EXFO FTB-8500 Series for FTB-500 - Manual (Page 207)

Traffic Analyzer Tabs
Ethernet and Fibre Channel Application 193
FC RX
FC RX
Press TEST, Traffic Analyzer, and FC RX.
Alarm Analysis

Link Down: Indicates that the fibre channel connection is down. The
fibre channel connection is down if there is a local or a remote fault
condition including LOS, loss of code-group synchronization, and PSP
failure (when enabled).

Local Fault (FC 10x): Indicates that at least one of the following events
is detected: LOS, Loss of bit synchronization, Loss of Block
synchronization, Link down, or High BER (High BER is true when the
bit error ratio > 10
-4
on a fixed 125 μs time period).

Remote Fault (FC 10x): Indicates that a Remote Fault event is
detected.
Note: Alarms/Errors are updated only during test execution.