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Telephone

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صورة
Telephone A traditional  landline  telephone system, also known as  plain old telephone service  (POTS), commonly carries both control and audio signals on the same  twisted pair  ( C  in diagram) of insulated wires, the telephone line. The control and signaling equipment consists of three components, the ringer, the hookswitch, and a dial. The ringer, or beeper, light or other device (A7), alerts the user to incoming calls. The hookswitch signals to the central office that the user has picked up the handset to either answer a call or initiate a call. A dial, if present, is used by the subscriber to transmit a telephone number to the central office when initiating a call. Until the 1960s dials used almost exclusively the  rotary  technology, which was replaced by  dual-tone multi-frequency signaling  (DTMF) with  pushbutton telephones  (A4). A major expense of wire-line telephone service is the outside wire pl...
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