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BASIC OF TELEPHONE
Some pushbutton telephones have a dial selector switch for selecting
between tone dialing (PB) and pulse dialing. With these pushbutton tele-
phones, if the selector switch is set to pulse dialing, the telephone outputs
dial pulses even though the telephone looks like a pushbutton telephone.
3.3
Digital Telephones
Though digital telephones also have 12 buttons just like a pushbutton tele-
phone, the dialing signals are output not as a tone (frequency) but as a code
comprising a combination of digital 0s and 1s. Also, the signals for ringing
the bell on the other party's telephone are sent as a code comprising a com-
bination of digital 0s and 1s.
1–12
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