Patent ID: 7318754

Claim:
A keyed modular connection system, comprising: a preselected nonstandard wiring configuration; a plug wired in the preselected nonstandard wiring configuration and comprising exterior surfaces, at least one of said exterior surfaces defining a plug recess; a jack wired in the preselected nonstandard wiring configuration and comprising interior surfaces, at least one of said interior surfaces defining a jack recess; a plug protrusion extending from at least one of the exterior surfaces of the plug and configured to be received by the jack recess when the plug is inserted into the jack; a jack protrusion extending from at least one of the interior surfaces of the jack and configured to be received by the plug recess when the plug is inserted into the jack; wherein when a plug not wired in the preselected nonstandard wiring configuration is attempted to be inserted into the jack, the jack protrusion prevents the attempted insertion, and when the plug is attempted to be inserted into a jack not wired in the preselected nonstandard wiring configuration, the plug protrusion prevents the attempted insertion.