RJ45?

im not a professional but my belief is,

RJ45 is for an ethernet connection mainly used in Local Area Network

A telephone socket is called an RJ12

Actually, it's RJ-11, but who's counting...

thanks, fellas.

appreciate much for your brief and clear explanation.

Happy new year 2008 to you all.

RJ45 is, indeed, for Local Area Network. It consists of a 4-pair twisted wire. For the Telephone Jack, an RJ11 or RJ12 can be used. The difference between the RJ11 and the RJ12 is that RJ11 on has 4 contacts were the RJ12 has 6 contacts. Each pair of contacts makes up one phone line. Hope this helps.

Add this info. The replies explaining the RJ standard are great. For further info, the wire used with the RJ-11 and RJ-12 is called, by the telephone industry "Station Wire", and is typically voice grade, unshielded wire. That used for RJ-45 is what provides for 10/100 baseT, Cat 4, Cat 5, or Cat 6 (up to 100 MBps data throughput), and is 4 pair, Unshielded Twisted Pair (UTP), usually marked Cat-5 UTP on the cable sheath.

So, you folks were dead on about RJ-11 and -12 being telephone, and RJ-45 being Local Area Network (LAN) cabling and connection standards.

BTW, and I don't know what countries you are in, here in the USofA, we can buy all of the necessary tools, cables, connectors, wall finish fittings, routers, etc, online, or from any of several stores common to our larger cities, for very reasonable prices. Some online/catalog sources include MCMinOne and All Electronics. I have no affiliation with either, but have done business with both, with good success. There are many others.

Micah

RJ45 connectors are used not only in computer LAN's like Ethernet, but also for multi-line (business type) telephone systems.

RJ45 connectors are also commonly used in RF communications as standard quick change connectors for microphones and headsets for mobile communications. In many cases they are a direct replacement for 8-pin barrel-type screw-on connectors and most manufacturers (and many after market manufacturers and home-brewers like ham radio operators) make adapters for certain models or lines if they are compatible.

Probably not your application but I thought I would throw this in.

Ethernet LAN cables, which use RJ45 connectors, can often be used as microphone or headset extensions or replacements, provided the correct gender changer is used if two cables are connected together. Radioshack, for example sells female to female molded connectors that allow connection of two male cable ends. However, you must be sure to purchase the correct one because there are two versions, one for "Audio" and one for "Data", because in one case Pin 1 of the male goes to Pin 8 of the female and in the other case it is Pin 1 to Pin1. I do not remember which way it is, but curiously, if you are connecting a radio microphone or headset (audio, right?) you need the one marked "Data", I guess because you are using the LAN cable that is set up for Data. Many modern mobile microphones are also controllers for the radios, so in that sense "Data" as well as "Audio" is carried over the cables. I guess the radio manufacturers had to pick one standard over the other and fortunately they picked the one for which there are plentiful choices in pre-made cables to choose from.

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STL Engineer wrote: RJ45 connectors are used not only in computer LAN's like Ethernet, but also for multi-line (business type) telephone systems.

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... such as VOIP systems.

telephone is rj-11

one use of rj-45 is for networking switches, routers, hubs, servers and computer together by using NIC or network interface card or rj-45 ports on routers, hubs, and servers you use rollover, straight-through and cross-over cables or use rj-45 and a cross-over cable to run a point of entry for a wireless network, each patch cable has different connection pinout for each piece of equ.

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