EXFO ETS-1000 - Manual (Page 42)

Typical Tasks and Solutions
34 ETS-1000
RFC 2544 Methodology
Throughput
This test allows to determine the maximum possible rate for the
Ethernet-networks equipment.
Throughput: the fastest rate at which the number of test frames transmitted
by the DUT is equal to the number of test frames sent to it by the test
equipment.
When measuring the throughput, specific number of frames with
minimum interframe gap is sent to DUT. Then, the analyzer counts the
frames that are transmitted by the DUT. If the fewer frames are received
than transmitted, the interframe gap is increased and the test reruns.
Note: The relation between interframe gap and load is inverse, thus, the bigger
the gap value is the lesser the load is.