Network Communications Chapter 9

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Presentation transcript:

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 Physical “Star”, Logical “Ring” MAU: Multi-station Access Unit Localizes connections (ease of Maintenance) Automatic bypass of unused ports Figure 9.2

Multi-Station Access Unit Figure 9.3a &9.3b

MAU Operation Figure 9.4 Figure 9.5a Figure 9.5b

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

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

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

Token Ring NIC Figure 9.12

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

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