Fault-triggered switch overs are automatically performed when a system detects board faults. Manual switch overs involve manual operations. 

Switch overs caused by  faults are automatically  performed  when a system  detects board faults to make sure that the services run normally . Thus, services are not interrupted by a board fault and losses caused by faults are reduced.

Switch overs caused by faults are automatically performed when a system detects board faults. Manual switch overs involve manual operations. For boards working in master/slave mode, the UMG8900 supports fault-triggered switch overs 
and manual switch overs, which facilitates device maintenance and fault location. The two switch over modes do not affect service connectivity

This feature is applicable to the VMSC, GMSC, and TMSC. 

Very good topics.

Manual switch overs involve manual operations. Can you pls share the manual operations also?

What is the difference between fault-triggered switch overs and manual switch overs?

good description

what a great idea

useful document, thanks