EXFO FTB-8500 Series for FTB-500 - Manual (Page 423)

Tools Tabs
Ethernet and Fibre Channel Application 409
802.3ah Configuration

Loopback
Request allows the selection of the loopback request to be sent to the
remote OAM link partner. Choices are Enabled and Disabled. The
default setting is Enabled. The request will only be sent when pressing
the Send button.
Send allows sending the selected request to the remote OAM link
partner.
Remote Status: Indicates the status of the remote OAM link partner.
OAM Discovery Statistics

Local
Status indicates the local OAM link discovery status. Possible status are
Evaluating, Stable, and Unsatisfied.

Remote
Status indicates the remote OAM link discovery status. Possible status
are Evaluating, Stable, and Unsatisfied.
Critical Event: Indicates that the OAM link partner has sent a critical
event notification.
Dying Gasp: Indicates that the OAM link partner has sent an
unrecoverable local failure notification.
Link Fault: Indicates that the OAM link partner has sent a link fault
notification.