BASIC OF TELEPHONE1–144.2Pushbutton TelephoneThe 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 generatordiffers.Fig. 1-15Basic Circuit of Pushbutton TelephoneRTHSBellT: TransmitterR: ReceiverHS: Hook switch12 pushbuttonsand DTMFgenerationcircuit
