EXFO FTB/IQS-85100G Packet Blazer for FTB-500/IQS-600 - Manual (Page 81)

Test Setup - Test Configurator, Timer, and System
Packet Blazer 71
Clock
Clock Output (HS)
Note: Available with OTU4/100GE (4 Lanes) interface/rate.
Frequency (MHz) displays the frequency of the generated clock signal on
the CLOCK OUT HIGH SPEED port.
Clock Out indicates that a clock is generated on the CLOCK OUT HIGH
SPEED port (green) or not (red).
Note: Refer to CFP/CFP2 Reference Clock (MHz) on page 253 for more
information.
Backplane
Note: Available when the Clock Mode is set to External or Internal.
Backplane Clock check box allows, when selected (cleared by default), to
enable the backplane clock based on the selected clock mode.
Backplane indicates that the background clock is generated (green) or
disabled (gray).
LOC on a red background indicates, when the backplane clock is enabled,
that the synchronization is not possible with the selected reference clock.