What is RJ-45 and full name of RJ-45?

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Kalyan Raghavan

  • Apr 14th, 2006

RJ45 (Registered Jack 45) is a physical interface often used for terminating twisted pair type cables. "RJ" stands for Registered pack which is part of theUnited states Code of Federal Regulations. It has eight "pins" or electrical connections per connector.

It is frequently terminated using the T568A or T568B pin/pair assignments that are defined in TIA/EIA-568-B:

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  • May 1st, 2006

Thank you sir,

What is the meaning of 45?

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A Balaji

  • May 22nd, 2006

Dear Sir,

Many Thanks for your information.



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Ashish Gupta

  • Nov 17th, 2006

Its Regulated Jack 45

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Ritesh Patel

  • Feb 2nd, 2007

RJ 45 is called Registered Jacks.

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  • Apr 3rd, 2007

RJ stand for the registered jack and the mean of the 45 is that the pin number of jack 1236 are only active other pin are deactive pin there is a break of activation at 45 pin so its known as the rj45.

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qbdul majid

  • Sep 27th, 2012

what is rj-45 conector and what is 45

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  • Dec 4th, 2012

Pin 4 & 5 are not used for data communication in RJ45 modular connector.

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Dinesh Arumugam

  • Mar 7th, 2016

RJ45 - RJ Stands for registered jack and 4 represents 4 pairs of wire and 5 represents five twist per inch to decrease capacitance effect. Because this two wires act as a parallel plate and the plastic surface act as a dielectric medium. To reduce this effect twisting of wires is employed.

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