Understanding Virtual Circuit Switching in Frame Relay and ATM Networks

1. Chapter 18 Virtual Circuit Switching:Frame Relayand ATM

2. 18.1 Virtual Circuit Switching Global Addressing Virtual Circuit Identifier Three Phases Data Transfer Phase Setup Phase Teardown Phase

3. Figure 18.1Virtual circuit wide area network

4. Figure 18.2VCI

5. Figure 18.3VCI phases

6. Figure 18.4Switch and table

7. Figure 18.5Source-to-destination data transfer

8. Figure 18.6SVC setup request

9. Figure 18.7SVC setup acknowledgment

10. 18.2 Frame Relay Architecture Frame Relay Layers FRAD VOFR LMI

11. Figure 18.8Frame Relay network

12. Note: VCIs in Frame Relay are called DLCIs.

13. Figure 18.9 Frame Relay layers

14. Note: Frame Relay operates only at the physical and data link layers.

15. Figure 18.10Frame Relay frame

16. Note: Frame Relay does not provide flow or error control; they must be provided by the upper-layer protocols.

17. Figure 18.11Three address formats

18. Figure 18.12FRAD

19. 18.3 ATM Design Goals Problems Architecture Switching Layers

20. Figure 18.13Multiplexing using different frame sizes

21. Note: A cell network uses the cell as the basic unit of data exchange. A cell is defined as a small, fixed-sized block of information.

22. Figure 18.14Multiplexing using cells

23. Figure 18.15ATM multiplexing

24. Figure 18.16Architecture of an ATM network

25. Figure 18.17TP, VPs, and VCs

26. Figure 18.18Example of VPs and VCs

27. Note: Note that a virtual connection is defined by a pair of numbers: the VPI and the VCI.

28. Figure 18.19Connection identifiers

29. Figure 18.20Virtual connection identifiers in UNIs and NNIs

30. Figure 18.21An ATM cell

31. Figure 18.22Routing with a switch

32. Figure 18.23ATM layers

33. Figure 18.24ATM layers in endpoint devices and switches

34. Figure 18.25ATM layer

35. Figure 18.26ATM headers

36. Figure 18.27AAL1

37. Figure 18.28AAL2

38. Figure 18.29AAL3/4

39. Figure 18.30AAL5