4RF Aprisa XE User Manual page 79

To select the terminal clock source:
The Clock Source selected for the terminal will be used to clock all interface ports requiring clocking and
send a clocking signal over the RF link.
Select Link or Local or Remote > Terminal > Clocking > Clock Source and select one of the following:
Clock Source
External
Internal
Link
If the terminal Clock Source is set to External, the terminal will automatically clock from the nominated
primary external clock source if that clock source is available.
If the nominated primary external clock source is not available, the terminal will clock from the
nominated secondary external clock source if that clock source is available.
If the nominated secondary external clock source is not available, the terminal will clock from the internal
clock source.
When a nominated external clock source becomes available (primary or secondary), the terminal will then
clock from that clock source.
The terminal at one end of the link must have its clock source set to Internal or External and the terminal
at the other end of the link must have its clock source set to Link.
Terminal Clocking
The terminal is clocked from the nominated interface port selected as
the primary external clock or the secondary external clock.
The terminal is clocked from the terminal's internal clock.
The terminal is clocked from the RF link.
Aprisa XE User Manual
Configuring the Terminal | 77