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Network Communications Chapter 9

Network Communications Chapter 9. Token Ring and Token Bus Networking Technology. Token Ring (Logical) Topology. IEEE 802.5 Token: 3 bytes “Permission to send” Early Systems IBM Apollo Workstations Bay Networks (now Netgear/Nortel). Figure 9.1. Token Ring Physical Topology.

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Network Communications Chapter 9

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  1. Network CommunicationsChapter 9 Token Ring and Token Bus Networking Technology

  2. Token Ring (Logical) Topology • IEEE 802.5 • Token: 3 bytes“Permission to send” • Early Systems • IBM • Apollo Workstations • Bay Networks (now Netgear/Nortel) Figure 9.1

  3. Token Ring Physical Topology • Physical “Star”,Logical “Ring” • MAU: Multi-stationAccess Unit • Localizes connections (ease of Maintenance) • Automatic bypass of unused ports Figure 9.2

  4. Multi-Station Access Unit Figure 9.3a &9.3b

  5. MAU Operation Figure 9.4 Figure 9.5a Figure 9.5b

  6. Token Frame Format • j & k bits: Differential Manchester code violations • ED: j k 1 j k 1 0 e (error = 1) Figure 9.6Token Frame Format Figure 9.7SD Timing

  7. P P P T M R R R Access Control Byte • P: priority • T: token (0- frame, 1- token) • R: reserve • M: monitor (1- active monitor removes frame) Figure 9.8

  8. A C R R A C R R F F F R R Z Z Z Z 802.5 Formats Figure 9.9: MAC& LLC (802.2) Figure 9.10: Frame Control Figure 9.11: Frame Status

  9. Token Ring NIC Figure 9.12

  10. Token Ring vs. Ethernet Priority Routing Info Frame Type Frame Size Performance Cable Speed Token Ring Yes Yes IEEE 802.5 1 – 18 Kbytes Deterministic (sic) UTP/STP/Fiber/Coax 4/16 Mb/s Ethernet No No IEEE 802.3 1 – 1.5 Kbytes Variable UTP/STP/Fiber/Coax 10/100/1000 Mb/s Table 9.3

  11. Token Bus • Defined for factory automation LANs • Not widely used (Ethernet performance adequate) Figure 9.13

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