Pushbutton Telephone - Canon FACSIMILE BASIC 2000 Service Manual

BASIC OF TELEPHONE
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.
1–14
Bell
HS
Fig. 1-15 Basic Circuit of Pushbutton Telephone
12 pushbuttons
and DTMF
generation
circuit T
T: Transmitter
R: Receiver
HS: Hook switch
R