EXFO FTB-8500 Series for FTB-500 - Manual (Page 397)

System Tabs
Ethernet and Fibre Channel Application 383
Clock Synchronization
Clock Synchronization
Note: Clock Synchronization is only available for Ethernet 10G and Fibre
Channel 10x interfaces as well as for Dual Test Set in one-way latency
measurement mode.
Press System and Clock Synchronization.
RX
Configuration: Allows the selection and configuration of the input clock.
This clock will be used for test synchronization if External clock has been
selected during test setup and/or for the backplane configuration when
External clock mode is selected.

Interface Type: Allows the selection of the clock interface. Choices are
None, DS1, and E1. The default setting is None. For FTB-8120NGE and
FTB-8130NGE, the Interface Type is automatically set to 1PPS in Dual
Test Set one-way latency measurement mode.

Termination Mode: The termination mode is set to Term for DS1
and E1.