Y-Interface; is more a cable interface than a interfacing bus, in that there is no standard that defines it. A Y-interface is an electrical and physical interface between three ports on one or more devices. The Y-Interface either combines two different ports [on one or more components] into one port, or it takes one port and sends that information to two different devices. Because there is no standard, the ports, their connector types and the signal that use the cable could be anything. In effect it becomes just a unique cable assembly between ports.

Y-cables are found in many applications including audio systems and power systems and regular interfacing. A good example would be a power cable running from a PC mother-board than to both a hard drive and floppy drive to supply power to those devices. An audio cable could be an 1/8 inch mini-plug to Red/White RCA connectors, forming a Y cable.

An alphabetic listing of released interface buses. The interface pages describe the physical and electrical communication aspects of the interface buses. A general description of the different Interface Bus protocol are location on there own page.