EXFO FTB-800 Series for FTB-1 - Manual (Page 481)

Test Control
NetBlazer 471
Lpbk Tool Button (Loopback Tool)
Loopback Tool tab
The Loopback Tool tab allows the configuration of the loopback
parameters and displays the traffic statistics as well as the S-OAM
Responder statistics.
Press the Lpbk Tool button and select the Loopback Tool tab.

Status: The status field displays the current status of the Loopback test.

-- (Idle): Loopback Tool is not looping back frames and results are
not available.

In Progress: Loopback Tool is looping back frames.

Completed: Loopback Tool is not looping back frames but results
are available. The test Status indicates Completed when the
loopback tool has been stopped.

Start Time: The time when the Loopback Tool was started.

Transparent (Pseudo-Physical) check box when selected (cleared by
default), determines that the Loopback tool operates as a physical
loopback by transmitting all received frames unaltered and without
discrimination.
In transparent mode, the Network tab and the S-OAM Responder
statistics are not available.
Note: The Transparent mode is intended to be used for point-to-point topology;
not for switched or routed networks. Use the Transparent mode with
caution because all received frames are looped back without
discrimination.