EXFO FTB-8500 Series for FTB-500 - Manual (Page 329)

RFC 2544 Tabs
Ethernet and Fibre Channel Application 315
Latency
Latency
The objective of this test is to find the time required for the sent frame to go
through the device under test and return to the FTB-8500 Series and
FTB-8120NGE/8130NGE. Starting by sending a stream of frames for the
predefined duration (Test Time) and throughput (% Util.) at a particular
frame size (Frame Size), an identifying dependent tag is included in one
frame. The time at which this frame is transmitted is recorded
(timestamp A). When the tagged frames come back, the time is recorded
again (timestamp B) and the Latency result is: timestamp B - timestamp
A. The test is repeated for the defined number of times (Nb. of Trials to
average) and the average result is calculated. The test is performed for
each defined frame size.
Press TEST, RFC 2544, and Latency.
Note: Latency must be enabled from Global Configuration on page 298.