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Switching

Switching. ดร. อนันต์ ผลเพิ่ม Anan Phonphoem, Ph.D. anan@cpe.ku.ac.th http://www.cpe.ku.ac.th/~anan Computer Engineering Department Kasetsart University, Bangkok, Thailand. Switching. Point-to-point connection (Mesh) wasteful Multipoint connection (Bus) Distance (collision Domain)

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Switching

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  1. Switching ดร. อนันต์ ผลเพิ่ม Anan Phonphoem, Ph.D. anan@cpe.ku.ac.th http://www.cpe.ku.ac.th/~anan Computer Engineering Department Kasetsart University, Bangkok, Thailand

  2. Switching • Point-to-point connection (Mesh) • wasteful • Multipoint connection (Bus) • Distance (collision Domain) • Number of devices • Switch

  3. Switched Network

  4. Switching Methods Circuit switching Packet switching Message switching

  5. Circuit switched network

  6. Switch Creates a temporary connection between input/output

  7. A folded switch

  8. Switching Methods Circuit switching Packet switching Message switching Space-division Time-division

  9. Space-Division Switches:Crossbar Switches • Using electronic micro-switches (transistors) • Low efficiency (<25% use)

  10. Multistage Switch • More efficiency • Blocking

  11. Switching path • Also provide multiple paths

  12. Switching Methods Circuit switching Packet switching Message switching Space-division Time-division

  13. TDMTime-slot interchange (TSI)

  14. Time-slot interchange

  15. Space VS. Time-Division • Space-division switching + Instantaneous - # of cross points • Time-division switching + No cross point - Create delay

  16. Time-space-time (TST) switch Other combinations: TSST, STTS, etc.

  17. Switching Methods Circuit switching Packet switching Message switching Datagram Virtual circuit SVC PVC

  18. Circuit switching weakness • Design for voice (telephone) • Non-voice transmission is bursty • Data rate • Assume a single data rate for both ends • Inflexibility • Same path (no adaptation)

  19. Datagram approach Each packet is treated independently Packet is called Datagram

  20. Multiple channels in datagram approach B A  X B  Y

  21. Switching Methods Circuit switching Packet switching Message switching Datagram Virtual circuit SVC PVC

  22. Virtual Circuit • Same route – choose at start • PVC (Permanent VC) • Leased Line • SVC (Switched VC) • Dial-up

  23. Switched virtual circuit (SVC)

  24. Switched virtual circuit (SVC)

  25. Switched virtual circuit (SVC)

  26. Circuit-switched connection Virtual-circuit connection Circuit-switched VS. Virtual-circuit connection • Path VS. route • Dedicated VS. sharing

  27. Virtual Circuit in WAN

  28. VCI

  29. VCI Phases

  30. Switching

  31. Source-to-destination data transfer

  32. SVC setup request

  33. SVC setup acknowledgment

  34. Switching Methods Circuit switching Packet switching Message switching

  35. Message switching

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