RJ11 female to RJ45 male converter (RJ11 6P4C Female to Ethernet RJ45 8P4C Male Adapter). Converts an RJ45 socket (8P8C) socket to RJ11 (6P4C) socket. Can be used for various telecom applications. Other wiring options are available or we can manufacture custom versions upon request, please contact us for details. It has become common for non telecom applications such as low voltage lighting control systems & central heating controllers to utilise RJ series plugs, these adaptors are suitable for these systems.