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 ?