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An RJ45 connector is a commonly used modular interconnection device matched with a cable to provide data communication service to various electronic devices and systems.

The various connectors developed using this system were categorized by the FCC in 1976 into the Registered Jack (RJ) system, giving rise to the RJ label. This was done to ensure compatibility between phone company hardware and consumer equipment. The RJ system covers the physical connector, wiring patterns, and signal specifics.

RJ45 devices, like all modular connectors, contain metal contacts separated by insulating plastic channels. The channels fit into a matching socket and the connectors lock in place with a tab making them secure but also removable. Internally, RJ45 devices contain 8 pins and 8 wire positions used to handle signals or power, so they can accommodate 4 twisted wire pairs.

This 8-pin configuration of an RJ45 is similar to that of 8P8C connectors, but true RJ45 connectors also include a tab that only allows insertion of the device in one orientation with a compatible socket to avoid an improper wiring connection. Hence, an RJ45 is one type of an 8P8C connector. However, in common use most 8P8C connectors are referred to as RJ45, but this is not quite accurate. You can plug 8P8C connectors into RJ45 sockets, but you cannot do the reverse.

Features

• Shielding - to cancel the effects of EMI/RFI
  
• Keying - to ensure proper insertion
  
• Various mounting capabilities - to allow for panel, board, surface or through hole methods
  
• Displays and indicators - to indicate connection status
  
• Integrated magnetics - to allow for better shielding plus current protection
  
• Hi-Rel - to provide protection for the hardware and the connection