RJ11 and RJ45 Modular Plugs

Industry Standard For RJ11 and RJ45 Connections

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What's special about these plugs?



Part #DescriptionQuantityPrice
IT-RJ11P-SORJ11 4c Solid Round Mod Plug, UL Listed100
IT-RJ45P-SORJ45 8c Solid Round 50u Gold CAT5e100
IT-RJ45P-STRJ45 8c Stranded Round Plug 50u Gold CAT5e100
Part # Connection Type Round/Flat Solid / Stranded Quantity
IT-RJ11P-SO RJ-11 4c Round Solid 100
IT-RJ45P-SO RJ-45 8c Round Solid 100
IT-RJ45P-ST RJ-45 8c Round Stranded 100






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RJ11 4c Round Solid Mod Plug UL listed Qty 100

(based on 2 reviews)

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Economic Solution to bulk networking

By Matt the Tech Guy

from Calgary, AB

About Me Power User

Verified Reviewer


  • Consistent Performance
  • Good price value


    Best Uses

    • Small business

    Comments about RJ11 4c Round Solid Mod Plug UL listed Qty 100:

    Even ordering from Canada this is a more economic solution to bulk RJ45 heads. I ordered 1 bag to see if they were of the same quality as the ones I was getting up here, and they are so I'll be ordering more.

    • Primary use:
    • Business
    • Was this a gift?:
    • No

    RJ11 4c Round Solid Mod Plug

    By Bif

    from St. Louis, MO

    Verified Buyer


    • Easy To Set Up
    • Highly Compatible


      Best Uses

      • Small Offices

      Comments about RJ11 4c Round Solid Mod Plug UL listed Qty 100:

      RJ11s for solid wire have become more difficult to find.[...]

      • Primary use:
      • Business

      Displaying reviews 1-2

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      What is the RJ11 Jack/Plug Used for?

      BY: Shane Weaver


      The RJ11

      the usual suspects

      So, we've discussed RJ45 plugs used for Ethernet applications, and the difference between solid and stranded. But now we're going to hop in the DeLorean and go back in time a little bit to take a look at its predecessor, the RJ11. Superficially, the two modular plugs appear similar: both are clear plastic terminals at the end of cables that plug into similar looking jacks in your wall. But they are most definitely not interchangeable. Anyone who has accidentally grabbed an Ethernet cable and tried to cram it into a telephone jack (and vice versa) could tell you that it's not likely to get the desired result.

      How are They Different?

      rj11 vs rj45

      As we mentioned, the two plugs looks somewhat similar. But take a closer look-see, and you'll notice right off the bat when you compare the two that RJ45s are longer. Additionally, as you may have read in the aforementioned article, the true name of that plug is 8P8C, because it has eight pins and eight connections, meaning 8 wires can be run through it. RJ11 jacks, on the other hand, are six position, meaning both the modular plug and the jack can utilize up to six wires, or three pairs: pair being a term used in telecommunications to represent the twisting of two copper wires together, called, appropriately enough, a “copper pair.”

      Certification is another way to broaden the gap between the two. While RJ11 has no certifications, RJ45 is classified in many levels: CAT3, CAT5e, CAT6, etc…Though we tend think of RJ45s as the go-to terminal for computer networks today, Apple actually used RJ11s for their “Apple Talks Network” to connect several computers and printers together, using one pair for voice, and a second for data. However, this fell out of favor when ethernet wires, such as 10baseT, came into play around the early 90's.

      Nowadays, there's a pretty clear separation between the usage of the two plug types. So if RJ45 is for data networks, you may be asking, when should you break out the RJ11s?

      What are RJ11s Used For?

      for our readers under 30, this is what phones used to look like

      The short answer is: phones. RJ11s are mainly used in phone lines.

      The longer answer: The format is designed to carry voice or analog signals. They've been popular in home and business environments since before the 1980's, when many business telephone systems would use up all three copper pairs. The first pair would be used on two way talk, the second for incoming data (time display, speaker phone, line appearance, etc…), and the third pair would be used for bringing power to run the phone. The format is still used today in home and business phone lines, as well as fax machines and dial-up modems.

      So that's that, right? RJ11=phone, RJ45=computer network. Well, yeah, mostly, but like we said, the former can and has been used to tie data networks together before the widespread adoption of its successor, and likewise the latter actually can be used for phone lines, as we'll get to in just a minute.

      A Brief History Lesson

      Alexander Graham Bell: inventor of the telephone, and so much more

      So where did all these different plugs get their start? They haven't been around forever; I've seen those caveman displays in museums and they were definitely not using RJ11s to plug in their phones. In fact, my memory is a little fuzzy but I don't think they had phones at all. And I also am pretty sure Alexander Graham Bell didn't plug in his old timey phone with one. (though he DID invent the first optical cable). But no, ultimately, AT&T was the company responsible for the formats, and many others, and has signified the modular jack application.

      Though RJ11 has typically been the standard for telephones, AT&T actually used RJ45s for their phone systems, all the way back in the 1970s. AT&T's method still holds true today for some installers who prefer to use an RJ45 jack. If the patch panel is properly terminated and pinned out by the installer, it can be used for either an Ethernet cable for a computer network or a phone system. However, unless you are a trained installer, it's always best to stay on the safe side and use RJ11 modular and jacks for voice or analog applications, except when dealing with VOIP (Voice over IP)…in which case you'll want to stick with RJ45.

      Hopefully that gives you at least some insight into why you can't shove a Cat5e cable into your phone jack. If not, then we really can't help you.

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