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23 posts


#20448 26-Mar-2008 21:33
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Ez Crew,heres my problem I need to install a new phone jack in my room,I have a 2 wire extention pack and relized about the older 3 wire jacks from the inscrutions.So had a look around my house to see what I had.Now in the lounge under where the sky areial comes in theres a 2 wire jack but in the hall way I have a 3 wire jack with M on it(i know this is the master).Now from what I have read these two types should'nt be mixed and I need to replace the older 3 wire with a two wire jack.So can I just use the exsiting wires going into the 3 wire jack or do i need to replace the old wiring with new 2 wire?. I would like to run my new extention from this hallway postion as its closer to the room i need the new jack in or will I have to run it from the 2 wire jack in the lounge.Thanks

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  #119481 29-Mar-2008 09:20
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Hi, technically there is no reason is no reason why you cannot mix 2 and 3wire jacks, although a 3wire Slave jack on a 2Wire system will not ring the bells, hence for this and a few other reasonsTelecom made the mandate not to mix standards. As you can see the 2Wire jack keeps you Sky box happy. Because you are now wanting to add another wire to the back of the Master jack the need to upgrade it to a 2Wire jack makes good sense.

In a two wire jack there are two rows of IDC headers, each row normally has 3 positions in it. Each row is one leg of the phone circuit and each of those 3positions are all wired together. Therefore you can have several lines tapped off a jack with each line having its own IDC slot, which is important if you have lines with different gauge copper. So I recommend you replace the M 3Wire with a 2Wire to ease wiring.

The inbound line to the master jack has 2wires, thats all there is, so get another 2Wire jack and wire that to the inbound line, use the cable in the extention kit and wire it to the 2nd 2Wire jack in your bedroom, and do the same to the cable running to the Sky jack.


3495 posts

Uber Geek


  #119513 29-Mar-2008 12:48
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In residential situations the old 3 wire jacks didn't have great reliability. Damp air mixed with DC potential equals corrosion. The later jacks had changes to the circuit board layout and protective coating to reduce this problem. Old jacks that haven't failed yet are running on borrowed time.



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  #119742 30-Mar-2008 20:47
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Thanks Cyril7 & Bung,I have changed the old 3 wire jack to a 2 wire and run the extenion into my room so far its seems to work fine,i have a weekly internet radio show that runs for two hours and did my show with no problems/no drop outs,so thats good.The only thing I thought was strange,was that I had to couple two of the same wires into the same slot.I'm talking about the existing wires that ran into the 3 wire jack.The wiring had four wires all up,Two white two black(red on the inside),one white by its self one black by its self and then white and black that had been connected togther into some plastic connection.At first I ran just the black into the number 2 slot & white into 5,pluged the phone in but had no dial tone so then ran the black & white that was connected together also into the number 5 slot,pluged in the phone and had a dial tone,pluged my modem and had the internet running.So left this as is with no problems,it also stoped the bell ringing in the hall way which I wanted any way.Will this configration cause any prolems?Seems to be ok so far......

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