4 phone lines with one cat6 cable

Discussion in 'General Electronics Chat' started by electronewb, Oct 29, 2014.

  1. electronewb

    Thread Starter Member

    Apr 24, 2012
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    Hi guys Is it possible to have 4 phone lines using 1 cat6 cable? Basically I want to use 4 Rj11 plugs on one side of the cable and 4Rj11 box with jacks at the other end of the cable (so I can extend from a box to an actual phone) I believe only 2 wires are needed for a phone line and the contacts on the Rj11 are the 2 middle ones. Is that correct?
     
  2. Sensacell

    Well-Known Member

    Jun 19, 2012
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    Yep- but the jacks /plugs need to be 8 circuit RJ-45, not RJ-11

    4 pairs = 8 wires = 4 phone lines

    Just don't get 'em mixed up
     
  3. electronewb

    Thread Starter Member

    Apr 24, 2012
    260
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    Thanks for the reply. What do you mean by 8 circuit Rj45? You mean I need to use Rj45 connectors and jacks and not rj11? What would be the difference? Also this is right that only the 2 middle tabs are used for phone lines?

    Thanks
     
  4. ScottWang

    Moderator

    Aug 23, 2012
    4,854
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    RJ11 is right.
    Yes.

    So what you trying to do is a 4 phone lines extension connector?
     
  5. Sensacell

    Well-Known Member

    Jun 19, 2012
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    yes RJ-45 is an 8 wire jack, but the phones are 6 wire.
    Use RJ-45 for the cat-6 then break out the wires to the RJ-11
     
  6. ScottWang

    Moderator

    Aug 23, 2012
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    Phone are 4 wires used in single phone line.
    If the TS used telephone switchboard then 4 wires is not enough.
     
    Last edited: Oct 30, 2014
  7. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    An RJ-11 connector has six contact locations, but it takes only two (the center two) for a standard POTS phone. Very low-cost appliances such as answering machines used to come with an RJ-11-to-RJ-11 cable with only the center two contacts installed.

    Phone circuits are DC. A true analog phone won't care about polarity, but some electronic phones will not work with the wires reversed.

    ak
     
  8. electronewb

    Thread Starter Member

    Apr 24, 2012
    260
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    Here's what I'm trying to do
     
  9. Manfred Mans Earth Band

    New Member

    Oct 5, 2014
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    Last edited: Oct 30, 2014
  10. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
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    It used to be, that an analog phone won't break dial tone if the wires were reversed. Made dialing impossible!
     
  11. electronewb

    Thread Starter Member

    Apr 24, 2012
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    But is what's on the PDF that I've attached work?
     
  12. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
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    In your PDF, are all the wires contained in the cat 6 cable?

    Will the RJ11 jacks be connected by uncovered twisted pair?

    Would you consider a second box where the Ethernet cable was broken out to individual 4 conductor cables for the phones?

    Also? Why cat 6? Availability? Cat 6 is more stiff or rigid than cat 5/5e. Is that ok? And more expensive. Both have eight conductors.
     
  13. electronewb

    Thread Starter Member

    Apr 24, 2012
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    I have tons and tons of cat6

    But would my wiring works?
     
  14. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Answer the rest of disfantasi's questions in post 12, then we can start with some options...
     
  15. electronewb

    Thread Starter Member

    Apr 24, 2012
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    I did For some reasons the answers in my post were all over the place

    In your PDF, are all the wires contained in the cat 6 cable? Yes

    Will the RJ11 jacks be connected by uncovered twisted pair? I will put heatshring tubing on each pair

    Would you consider a second box where the Ethernet cable was broken out to individual 4 conductor cables for the phones? That's the plan each box will get a regular phone cable that will be hooked up to a phone

    Also? Why cat 6? Availability? Cat 6 is more stiff or rigid than cat 5/5e. Is that ok? And more expensive. Both have eight conductors.
    I have tons and tons of cat6
     
  16. djsfantasi

    AAC Fanatic!

    Apr 11, 2010
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    The wiring concept will work. The devil is in the details. The pairs must go to the correct pins in the jack/plug. Where the pairs separate, be sure to include strain relief. And protect the cables/wires where they enter/leave the boxes. And I'd make sure the polarities are correct, although others have indicated it may not be necessary.
     
  17. electronewb

    Thread Starter Member

    Apr 24, 2012
    260
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    Great thanks!!!
     
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