Low-cost multi-shelf cabling arrangement

摘要

An inexpensive cable is utilized to permit multiple identical shelves in a bay of interface units to be wired for a plurality of signals by utilizing conventional twenty-five pin wiring. Hand-wired dedicated cables normally used for routing alarm signals are avoided. Printed wiring backplanes are utilized for connecting the common signals together and for permitting appropriate connections for the plurality of individual signals to be connected to the appropriate interface units positioned in the bay. The backplanes have an identical pattern so that the interface units can be used interchangeably.