EXFO FTB-8500 Series for FTB-500 - Manual (Page 331)

RFC 2544 Tabs
Ethernet and Fibre Channel Application 317
Latency

Set All To: Enter a value in the Set All To and press OK to apply the
value to all frame sizes. Choices are listed in the above table.

Unit: Select the rate’s unit. Choices are %, and Mbps/Gbps. The
default setting is %.

Copy From Throughput Test: Enable Copy From Throughput
Test to get values from the Throughput test results. This check box
is selected by default.
Margin (%) allows to subtract a relative value to the maximum
throughput test values. The delta equal to the interface rate
multiplied by the Margin divided by 100. Thus, the maximum rate
equals to the maximum Throughput test value minus the delta
value. Choices are 0% to 10%. The default margin value is 0%.
Note: Set All To, Unit, and TX-to-RX/P1-to-P2/P2-to-P1/Local to
Remote/Remote to Local fields are not available when Copy From
Throughput Test is selected. P1-to-P2/P2-to-P1 is only available with
FTB-8510B.