EXFO FTB-8500 Series for FTB-500 - Manual (Page 177)

Traffic Analyzer Tabs
Ethernet and Fibre Channel Application 163
Ethernet RX
Ethernet RX
Press TEST, Traffic Analyzer, and Eth. RX.
Configuration
Oversize Monitoring
Enables the monitoring of the Oversize error.
Alarms Analysis

Link Down: Indicates that the Ethernet connection is down. The
Ethernet connection is down when there is a local or a remote fault
condition.

Local Fault (10Gig-E): Indicates that at least one of the following
events is detected: LOS, Loss of bit synchronization, Loss of Block
synchronization, WIS 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 (10Gig-E): Indicates that a Remote Fault event is
detected.
Note: Alarms/Errors are updated only during test execution.