What is it?A RJ12 connector or Registered Jack, is a 6P6C (6 pole, 6 connected) data connector commonly used for telephone systems and data networks. RJ12 modular connectors are constructed from clear plastic and have 6 gold contacts. They feature a tab that locks the plug into place providing a secure connection once inserted into the socket or faceplate. RJ12 connectors can be used with solid or stranded cable.What does it do?RJ12 connectors are used for connecting data and voice equipment to the local exchange network.ApplicationsTypical applications for RJ12 connectors are; Analogue phone lines Faxes