Canon fax basic 2000 서비스 매뉴얼

BASIC OF TELEPHONE

1–14

4.2

Pushbutton Telephone

The Fig. 1-15 shows the basic circuit of a pushbutton telephone.

Basically, the only difference between the circuit of a pushbutton tele-

phone and the circuit of a dial telephone is that the dialing signal generator

differs.

Fig. 1-15   Basic Circuit of Pushbutton Telephone

R

T

HS

Bell

T: Transmitter

R: Receiver

HS: Hook switch

12 pushbuttons

and DTMF

generation

circuit