6P6C

6P6C, short for six-position six-conductor, is a type of modular plug used in telephone wiring. The term describes the plug’s physical layout: six contact positions arranged to mate with a six-conductor jack. In common practice, 6P6C plugs are most often associated with RJ25 connectors, which are six-position, six-conductor jacks used for three telephone lines. The six conductors allow up to three separate two-wire circuits, though many installations use only one or two pairs and leave the remaining conductors unused.

The connector is part of the larger family of modular telephone connectors standardized for voice networks. Although visually similar to other modular plugs, a 6P6C plug is not pin-compatible with 6P4C or 8P4C variants, and should be paired with matching 6P6C jacks. In typical use, the extra conductors support additional lines or signaling in multi-line telephony equipment. The overall construction and latching mechanism are designed for reliable connection in office and residential wiring environments.

Applications for 6P6C wiring are primarily in older telephone systems and certain office devices that implement more than one line. In contemporary consumer networks, higher-speed data standards rely on other connector types, and 6P6C is generally not used for data networks. When present, 6P6C provides a straightforward means to implement up to three two-wire telephone circuits within a single cable.