Switching ดร. อนันต์ ผลเพิ่ม Anan Phonphoem, Ph.D. Computer Engineering Department Kasetsart University,

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Presentation transcript:

Switching ดร. อนันต์ ผลเพิ่ม Anan Phonphoem, Ph.D. 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

Switching Methods Circuit switchingMessage switchingPacket switching

5 Circuit switched network

6 Switch Creates a temporary connection between input/output

7 A folded switch

Switching Methods Circuit switchingMessage switchingPacket switching Space-divisionTime-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

Switching Methods Circuit switchingMessage switchingPacket switching Space-divisionTime-division

13 TDM Time-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.

Switching Methods Circuit switchingMessage switchingPacket switching DatagramVirtual circuit SVCPVC

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 A  X B  Y B

Switching Methods Circuit switchingMessage switchingPacket switching DatagramVirtual circuit SVCPVC

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

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

Switching Methods Circuit switchingMessage switchingPacket switching

35 Message switching