• What is RJ

RJ is the short name of Registered Jack, it is a standardized telecommunications network interface that provides an interface for sound and data transmission. The Registered Jack was first defined in the US Bell System General Service Ordering Code (USOC) system and was used in the 1970s to provide computer-aided telephone equipment authorized by the Federal Communications Commission (FCC).

Modular connectors are used to replace hardwired or larger telephone plugs. The general term for modular connectors includes the number of contact locations and the number of wires connected.

The 8P8C Registered Jack is used as an interface and is widely used in Ethernet networks.

• Specification

• Registered Jack Photos