The GPI16 card is a universal Synapse GPI I/O(Input/Output) card. The card is capable of forcing GPI output triggering based on events that are generated by cards located in the same rack. (E.g. An alarm/event generated by any specific card in frame. This alarm/event is put on the bus. The GPI16 card will monitor the internal bus for events and close a relay in case of an event). The GPI16 can also be used as a slave card for Synapse functions, the 8x1 switcher (SDX08) or the VWI10 card for example. In these applications it is possible to control functions directly in to a Master, e.g. GPI based channel selection of the 8x1 switcher SDX08.