EXFO FTB/IQS-88000 Series Power Blazer for FTB-2/2Pro/500/IQS-600 - Manual (Page 124)

Test Setup - Test Configurator, Timer, and System
112 FTB/IQS-88000 Series
Clock
Clock
Allows the configuration of the clock synchronization.
From the Test menu, tap Setup, Test Configurator, and tap on the clock
block.
Clock Synchronization
Clock Mode allows to select the source clock that will be used for
transmission (TX).

Internal: Internal clock of the unit (STRATUM 3).

Recovered: Line clock from the input port signal involved in the
test.

External: Clock signal from the EXT CLK port.

Backplane: Clock from another module on the platform. The other
module must support the backplane clock feature and must be
enabled. Not available when the Backplane Clock check box is
selected (see page 115).
Ext Clock In
Note: Available when the Clock Mode is set to External.
Allows to set the external clock for test synchronization.

Interface Type allows the selection of the clock interface:
DS1 (default), E1, 2MHz, or 1PPS. 1PPS is automatically selected for
Dual Test Set in One-Way Latency measurement mode.
Ext Clock In on a green background indicates that a valid clock is
received on the EXT CLK port
LOS on a red background indicates that the clock is not valid on the
EXT CLK port.