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Thread: How a phone center office still generate power to rj-11 port when breakdown?

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    DIY Junior Member jonathan's Avatar
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    Dec 2009
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    Unhappy How a phone center office still generate power to rj-11 port when breakdown?

    hi all,

    as we know the rj-11 which generate 48DV voltage from the center office.
    even when our house electricity break down we still can make call.
    if the center office also break down ? does the rj-11 still supply power to our phone? how does it work ? my lecturer say it still can make call! but where does the energy came from ? does the rj-11 can store enegy for a long duration? or the center office have a very large power generator ? if got a generator it support to MIllion of people at once ? i think that is impossible. OR maybe center office there got many capacitor attach to the rj-11 port circuit....

    i'm really confuse at it ... can someone give me a guidance ?
    Last edited by jonathan; 12-03-2009 at 05:07 PM. Reason: not complete sentence

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