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802.5 Token-Ring Networks: Topology

802.5 Token-Ring Networks: Topology. An alternative to Ethernet 802.3 LANs Physical Layer Topology: Ring Stations connected in a loop Signals go in only one direction, station-to-station Not bus physical layer topology like Ethernet 802.3. 802.5 TRN Physical Layer: Topology.

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802.5 Token-Ring Networks: Topology

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  1. 802.5 Token-Ring Networks: Topology • An alternative to Ethernet 802.3 LANs • Physical Layer Topology: Ring • Stations connected in a loop • Signals go in only one direction, station-to-station • Not bus physical layer topology like Ethernet 802.3

  2. 802.5 TRN Physical Layer: Topology • Physically, stations connect to access units which are connected in a ring Access Unit Access Unit Access Unit Access Unit STP link from Station to Access Unit UTP Link from Station to Access Unit Stations Station

  3. 802.5 TRN Physical Layer: Wiring • Most connections use shielded twisted pair (STP), which has each pair and the whole cable covered with a metal shield to reduce interference STP link between Access Units Access Unit Access Unit Access Unit Access Unit STP link from Station to Access Unit UTP Link from Station to Access Unit Stations Station

  4. 802.5 TRN: Physical Speed • 802.5 Speeds • Initially, 4 Mbps • Now, mostly 16 Mbps • 100 Mbps is standardized but not widely used

  5. 802.5 TRN MAC Layer: Token Passing • Media Access Control • Not CSMA/CD • Token passing • Special frame called a token circulates • Station can only transmit if it has the token Transmits Token

  6. Token-Ring Networks • 802.5 Token-Ring versus 802.3 CSMA/CD-Bus • Token-Ring is more reliable • Token-Ring is more efficient • Token-Ring is more expensive • Token-Ring has a small market share • Companies buy something good enough to meet requirements, and 802.3 standards do this

  7. 802.3 Ethernet versus 802.5 Token-Ring Network • Both use 802.2 Standard at the LLC Layer • MAC Layer: CSMA/CD versus token-passing • PHY Layer Topology: Bus versus Ring 802.3 802.5 LLC 802.2 MAC Access Control CSMA/CD Token Passing PHY Topology Bus Ring

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