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Re: Test phone jack without service subscription?

Discussion in 'General Electronics' started by Sjouke Burry, Dec 3, 2011.

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  1. Sjouke Burry

    Sjouke Burry Guest

    Take a second phone, wire both to 50 volts dc, put 600
    ohms in series with the 50 volt power, and you have a
    miniature phone system.
    Take both sides off hook and you can talk to each other.
  2. Jasen Betts

    Jasen Betts Guest

    You'll see about 48V on phone jacks that are hooked up to the CO
    if you don't see any voltage on the jacks it's a reasonable bet that
    they aren't connected to the CO.

    That won't tell you if your connected to a DSLAM though, you can't
    measure that with a multimeter.

    If you do have DSL on the line you should get the line-sync LED on
    the DSL modem lighting up solid, but there will be more info on the
    status page of the modems configuration interface..
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