1. Chapter Six
Token-Passing LANs

2. Four basic steps in the operation of a token ring Figure 6.1

3. Frame structures used by IEEE-802.5 Figure 6.2

4. Formats of fields in an IEEE-802.5 frame Figure 6.3

5. Illustration of differential Manchester encoding Figure 6.4

6. Basic closed-loop configuration for token rings Figure 6.5

7. Example of stations connected via a wiring center Figure 6.6

8. A series of MAUs can be connected into a large ring Figure 6.7

9. Example of the bypass technique in a loop Figure 6.8

10. Example of the self-healing technique in a loop Figure 6.9

11. Timing diagrams for a < Tm and a > Tm Figure 6.10

12. Concept of a Dedicated Token Ring (DTR) architecture Figure 6.11

13. FDDI consists of dual self-healing counter-rotating rings Figure 6.12

14. The four FDDI standards and their functions Figure 6.13

15. Data and token frame formats of FDDI Figure 6.14