EXFO FTB/IQS-85100G Packet Blazer for FTB-500/IQS-600 - Manual (Page 131)

Test Setup - Test Configurator, Timer, and System
Packet Blazer 121
RFC 2544 - Subtests
Latency Configuration
The objective of the test is to measure the time required for the frame to go
through the device under test and return back to source. Starting by
sending a stream of frames for the predefined duration (Trial Duration)
and throughput (Max. Rate) at a particular 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 frame comes
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 (Trials) and the average result is calculated. The test is performed
for each defined frame size.

Trial Duration represents the time value for each trial in
“minutes:seconds”: 1 second (default) to 2 minutes.

Trials represents the number of times the test will be generated:
1 (default) to 50 trials.

Copy From Throughputcheck box, when selected (default), uses the
Throughput subtest results max rate value for each corresponding
frame size. When the check box is cleared, it is possible to set the
Max. Rate by tapping on the Config. per Frame Size button.

Margin %, available when Copy From Throughput check box is
selected, decreases the max rate value(s) from the Throughput subtest
by a value corresponding to the percentage of the line rate specified:
0 (default) to 10%.

Config. per Frame Size is available when the Copy From Throughput
check box is cleared and allows to set the Max. Rate for each frame
size. For Dual Test Set the Max. Rate is configurable for both local to
remote (L -> R) and remote to local (R -> L) directions.
All Frames check box when selected (cleared by default) allows to
enter the maximum rate that will be applied to all frame sizes.