EXFO FTB/IQS-85100G Packet Blazer for FTB-500/IQS-600 - Manual (Page 77)

Test Setup - Test Configurator, Timer, and System
Packet Blazer 67
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).

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 71).
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, or 2MHz.
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.