Abstract: A self-normalling jack with a magnetically controlled normal circuit, switch or relay comprising a pair of receptacles having a sensing means for sensing the insertion of a plug, the sensing means in communication with an electronic normalling circuit, switch or relay, the electronic normalling circuit, switch or relay in communication with a paired receptacle such that the electronic normalling circuit, switch or relay is located between the source terminal and the source jack and between the destination jack and the destination terminal. The sensing means being the interruption or non-interruption of the magnetic field by the presence or absence of a patch cord in the jack respectively.

Abstract: A self-normalling jack with an electronically controlled normal circuit or relay comprising a pair of receptacles having a sensing means for sensing the insertion of a plug, the sensing means in communication with an electronic normalling switch or relay, the electronic normalling switch or relay in communication with a paired receptacle such that the electronic normalling switch or relay is located between the source terminal and the upper jack and between the lower jack and the destination terminal. The electronically controlled normalling circuit or relay also connects the source to the destination when no patch cord is inserted into either the upper or lower jack receptacle. When the patch cord is inserted into the upper jack, the source signal is connected to the patch plug. When the patch cord is inserted into the lower jack, the destination signal is connected to the patch plug. Inserting a cord into either jack receptacle disconnects the source from the destination.

Abstract: A self-normalling jack with a magnetically controlled normal circuit, switch or relay comprising a pair of receptacles having a sensing means for sensing the insertion of a plug, the sensing means in communication with an electronic normalling circuit, switch or relay, the electronic normalling circuit, switch or relay in communication with a paired receptacle such that the electronic normalling circuit, switch or relay is located between the source terminal and the source jack and between the destination jack and the destination terminal. The sensing means being the interruption or non-interruption of the magnetic field by the presence or absence of a patch cord in the jack respectively.

Abstract: A self-normalling jack with an electronically controlled normal circuit or relay comprising a pair of receptacles having a sensing means for sensing the insertion of a plug, the sensing means in communication with an electronic normalling switch or relay, the electronic normalling switch or relay in communication with a paired receptacle such that the electronic normalling switch or relay is located between the source terminal and the upper jack and between the lower jack and the destination terminal. The electronically controlled normalling circuit or relay also connects the source to the destination when no patch cord is inserted into either the upper or lower jack receptacle. When the patch cord is inserted into the upper jack, the source signal is connected to the patch plug. When the patch cord is inserted into the lower jack, the destination signal is connected to the patch plug. Inserting a cord into either jack receptacle disconnects the source from the destination.

Abstract: A patch panel and distribution amplifier system within a single housing, including an input module and a plurality of output modules within the housing interconnected to a rear panel for input and output connectors and a front panel for the interconnection of jacks to the input and output modules of adjacent patch panel and distribution amplifier housings all connections being configurable to conform to all signal formats.