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BASIC OF TELEPHONE

1–12

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.