EXFO FTB-8500 Series for FTB-500 - Manual (Page 419)

Tools Tabs
Ethernet and Fibre Channel Application 405
ADC Configuration

ENIU Status: Indicates the ENIU status. Possible statuses are:
Valid: The remote ENIU satisfies the following conditions: support
loopback, no events detected, ENIU stable, and OAM PDU version of
both ENIU and EXFO are compatible.
Rejected:
The remote ENIU is rejected because it is sending critical event
notification.
The remote ENIU does not support loopback.
The remote ENIU is not stable.
Incompatible: The ENIU and OAM protocol versions are incompatible.
Timeout: The Ethernet and Fibre Channel Application has not received
OAM PDU in the last 30 seconds.

Refresh List: Allows refreshing the remote ENIU list by re-starting the
discovery process.
Press any ENIU from the list to select it. The selected ENIU information is
then displayed in the Selected ENIU section. Only ENIUs having a Valid
status can be selected.