Basic work of phone:
- Communication between the two users takes place by the waves.
- Sound Wave of one end user is converted to electronic waves or set of bits.
- Converted bit are transferred to other end user.
- Communication of voice takes in two forms
- Analog Signal System
- Digital Signal System
- According to the system, phones are invented in order to work for the method.
Analog Phones:
- These Phones uses an Analog Signal System.
- In Analog Phones, sound waves are converted to the electronic signals.
- These phones are the first type in phone technology invented by Graham Bell in 1876.
- Known as Plain old Telephone Service(POTS).
Digital Phones:
- These Phones uses a Digital Signal System.
- In Digital Phones, sound waves are converted to the binary numbers 0's and 1's.
- These Phones are inverted.
Comparison between Analog and Digital:
| Analog | Digital | |
|---|---|---|
| Call Quality | Better | Clear |
| Security | Not Secure | More Secure |
| Cost | Inexpensive | Expensive |
| Features | Call Waiting,Hold, Mute | Call Waiting,Caller ID,Hold, Digital Display |
| Set Up | Easy to Setup | Needs Professional Support |
| Mobility | Requires Rewiring | Easily Movable |
| Call-Cost | Expensive Compare to Digital | Bit Inexpensive |
| Good-For | Home, Small Bussiness | Home, Large Bussiness |