EXFO ETS-1000 - Manual (Page 97)

Configuring and Starting a Test
Ethernet Tester Analyzer 89
Pass Through
Pass Through
In the Pass through mode, the tester joins in line between two tested units.
All the traffic incoming to port A(B) is retransmitted to the port B(A). A
connection example is shown below.
During traffic retransmission from one port to another, the tester gathers
statistics on transmitted traffic. Statistics results are shown in the Statistics
menu.
When counting statistics data, damaged packets are not taken into
consideration.