RJ-45 Jack or Plug connectors provide the connection between devices in a network.
The RJ-45 connection was developed by Bell Telephone systems in the 1970's and has been adopted by the FCC and EIA. RJ stands for Registered Jack and 45 is the series of the connector. The RJ-45 connector is a modular type connector that is also referred to as an 8P8C, since it has 8 contact pins for 8 conductors. The RJ-45 connection has been adopted worldwide for data networks.
The wiring of the conductors to the RJ-45 has also been established by the TIA with two standards TIA-586A and TIA-586B.