1. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Chapter 18 Virtual Circuit Switching: Frame Relay and ATM

2. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 18.1 Virtual Circuit Switching Global Addressing Virtual Circuit Identifier Three Phases Data Transfer Phase Setup Phase Teardown Phase

3. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.1 Virtual circuit wide area network

4. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.2 VCI

5. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.3 VCI phases

6. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.4 Switch and table

7. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.5 Source-to-destination data transfer

8. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.6 SVC setup request

9. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.7 SVC setup acknowledgment

10. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 18.2 Frame Relay Architecture Frame Relay Layers FRAD VOFR LMI

11. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.8 Frame Relay network

12. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 VCIs in Frame Relay are called DLCIs. Note:

13. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.9 Frame Relay layers

14. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Frame Relay operates only at the physical and data link layers. Note:

15. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.10 Frame Relay frame

16. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Frame Relay does not provide flow or error control; they must be provided by the upper-layer protocols. Note:

17. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.11 Three address formats

18. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.12 FRAD

19. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 18.3 ATM Design Goals Problems Architecture Switching Layers

20. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.13 Multiplexing using different frame sizes

21. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 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. Note:

22. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.14 Multiplexing using cells

23. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.15 ATM multiplexing

24. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.16 Architecture of an ATM network

25. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.17 TP, VPs, and VCs

26. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.18 Example of VPs and VCs

27. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Note that a virtual connection is defined by a pair of numbers: the VPI and the VCI. Note:

28. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.19 Connection identifiers

29. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.20 Virtual connection identifiers in UNIs and NNIs

30. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.21 An ATM cell

31. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.22 Routing with a switch

32. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.23 ATM layers

33. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.24 ATM layers in endpoint devices and switches

34. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.25 ATM layer

35. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.26 ATM headers

36. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.27 AAL1

37. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.28 AAL2

38. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.29 AAL3/4

39. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 18.30 AAL5