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    BT External drop wire

    This is a discussion on BT External drop wire within the Cabling and faceplate help forums, part of the Sky Broadband help and support category; Hi all, Quick question (Hope I've asked in the right place!). My BT line is pre-1980's and wired as a ...

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      BT External drop wire

      Hi all,
      Quick question (Hope I've asked in the right place!).

      My BT line is pre-1980's and wired as a Star/spur system. The BT drop cable that enters the house has 2 wires both black - Does it matter which way round they are wired to the BT master socket (pins 2 and 5) - if so how can I identify the different wires?

      Cheers


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      Re: BT External drop wire

      Yes it does matter as one way the phones that use terminal 3 for a ring signal will not ring. Without a tester I don't think there is a way to know, you shouldn't do any damage if you get it the wrong way.
      adslnation

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      Re: BT External drop wire

      If you wish to be precise, use a good quality multimeter set to a voltage range of 100 V or more & check.

      A good article is here
      Code:
      http://www.wppltd.demon.co.uk/WPP/Wiring/UK_telephone/uk_telephone.html
      and an extract from it:

      Which way around they are connected usually doesn't matter but as Rick Hughes kindly pointed out some modems (especially older USA sourced ones) and some answering machines are fussy about polarity, so it's wise if possible to check the voltage on the line and connect -48V to the B leg (J2) and 0V to the A leg (J5).

      regards,

      Max.

     

     

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