# CT bus clocking overview

If the boards in a system are connected to each other on the CT bus, set up a bus clock to synchronize communications between the boards connected to the bus. In addition, to provide redundant and fault-tolerant clocking on the bus, configure alternative (fallback) clock sources to provide the clock signal if the primary source fails.

The topics in this section describe H.100/H.110 clocking as described in the ECTF H.110 Hardware Compatibility Specification: CT Bus R1.0. Not all boards support this specification completely. For information on setting up clocking with a particular board type, refer to the board documentation.

Note: Hardware clocking procedures are not transparent to the application. In addition to configuring clocking, the application must monitor clocking and take appropriate action when required.