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Explain circuit switching, packet switching and message switching.
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written 5.8 years ago by |
Sr. No. | Function | Message Switching | Circuit Switching | Packet Switching |
---|---|---|---|---|
1. | Concept | In message switching, each switch stores the whole message and forwards it to the next switch. Although, we don't see message switching at lower layers, it is still used in some applications like electronic mail (e-mail). | When you or your computer places a telephone call, the switching equipment within the telephone system seeks out a physical path all the way from your telephone to the receiver’s telephone. This technique is called circuit switching. | With this technology, packets are sent as soon as they are available. |
2. | Store and forward transmission | Yes | No | Yes |
3. | Terminal | Telegraph, teletype | Telephone, modem | Computer |
4. | Information representation | Morse, Baudot, ASCII | Analog Voice or PCM digital voice | Any binary information |
5. | Transmission system | Digital over various media | Analog and digital over various media | Digital over various media |
6. | Addressing | Geographical addresses | Hierarchical numbering plan | Hierarchical address space |
7. | Routing | Manual routing | Route selected during call setup | Each packet routed independently |
8. | Multiplexing | Character multiplexing, message multiplexing | Circuit multiplexing | Packet multiplexing shared media across networks |
9. | Basic User and Network | Transmission of telegrams (Telegraph network) | Bidirectional real time transfer of voice signals (Telephone network) | Datagram and reliable stream service between computers (Internet). |
10. | Call setup | No | Required | Not needed |
11. | Dedicated physical path | Not required | Yes | No |
12. | Packets arrive in order | - | Yes | No |
13. | Each packet follows the same route | - | Yes | No |
14. | Bandwidth available | - | Fixed | Dynamic |
15. | Time of possible congestion | - | At setup time | On every packet |
16. | Potentially wasted Bandwidth | - | Yes | No |
17. | Charging | - | Per minute | Per packet |