Telephone system involves the conversion of the sound signals into an audible frequency analog electrical signal, which can be then transmitted by radio, or wire. thus the telephone systems involves subscriber, suitable transmitting media and switching center. the establishment of voice communication between customers at a distant location is the main functin of the telephone system. It must provide many other services primarily the wide variety of computer data transmission. the telephone system is mostly multipurpose digital transmission network. In modern days due to the growth of technology most of the telecommunication environment is digital. all the proceeding of the voice as well as the digital data is done digitally in the switching center. the question arises why the digital communication is being chosen over the analog one. the following points suggests some reasons.
1. Ease of multiplexing
2. Ease of signalling
3. Use of modern technology
4. Integration of transmission and switching.
5. Signal regeneration
6. performance monitoring
7. Accomodation and other services
8. Less number of repeater are required
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