What is an RJ45 Connector? TECHbrief

A registered jack (RJ) is a standardized physical network interface for connecting telecommunications or data equipment. The physical connectors that registered jacks use are mainly of the modular connector and 50-pin miniature ribbon connector types. The most common twisted-pair connector is an 8-position, 8-contact (8P8C) modular plug and jack commonly referred to as an RJ45 connector.


  • An 8-pin/8-position plug or jack is commonly used to connect computers onto Ethernet-based local area networks (LAN).
  • Two wiring schemes–T568A and T568B–are used to terminate the twisted-pair cable onto the connector interface.

Popular RJ45 Jacks
Anixter # Manufacturer # Manufacturer Description
221198 MPS100E-246 CommScope Cat 5e RJ45 jack, white
246751 MGS400-318 CommScope Cat 6 RJ45 jack, blue
393213 MGS600-318 CommScope Cat 6A RJ45 jack, blue

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Contact your local Anixter representative or call 1.800.ANIXTER for more information.