EXFO FTB/IQS-88000 Series Power Blazer for FTB-2/2Pro/500/IQS-600 - Manual (Page 156)

Test Setup - Test Configurator, Timer, and System
144 FTB/IQS-88000 Series
Interface (Ethernet, Packet Sync, and Fibre Channel)
TX Frequency
Note: The following TX Frequency information applies to serial interface only,
refer to TX Frequency on page 133 for parallel interface.

TX Frequency (GHz) indicates the frequency (actual frequency +
Frequency offset) used for transmission.

Offset (ppm) check box, when selected (cleared by default), allows to
set the frequency offset that will be generated: ±120 ppm. Use the “+”
or “-” button to respectively increment or decrement the frequency
offset value based on the defined Increment/Decrement Size, or
directly type the frequency offset value in the field.

Step Size (ppm) allows to set the increment/decrement value (from
0.1 to the maximum offset) that will be used when changing the
frequency offset with the “+” or “-” button.