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A basic telephone or telephone set is an analog base-band transceiver. It has a handset which contains a microphone and a speaker, better known as a transmitter and receiver. It has also a ringer and dialing mechanism.
Telephone Functions:Overall the telephone set fulfills the following basic functions.
The Receiver Mode Functions:- An incoming signal that rings a bell or produces an audio tone, indicating that a call is being received.
- A signal to the telephone system indicating that the signal has been answered.
- Transducers to convert voice into electrical signals and electrical signals into voice.
- Indicates to the telephone system that a call is to be made when the handset is lifted.
- Transmit mode indicates that the telephone system is ready to use by receiving a signal called the dial tone.
- It provides a way of transmitting the telephone number to be called to the telephone system
- It receives an indication that the call is being made by receiving a ringing tone.
- Transmit mode of telephone set provides a means of receiving a special tone indicating that the called line is busy.
- This mode provides a means of signaling the telephone system that the call is complete.
Source :http://electrapk.com/telephone-set-and-its-functions/
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