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Emerged Technologies FDDI

Emerged Technologies FDDI. Nirmala Shenoy Information Technology Department Rochester Institute of Technology. FDDI. Purpose Fiber Distributed Data Interface I & II High Capacity LAN – fiber based, twisted pair High speed backbone to interconnect LANs Cost effective

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Emerged Technologies FDDI

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  1. Emerged TechnologiesFDDI Nirmala Shenoy Information Technology Department Rochester Institute of Technology updated 12/2001

  2. FDDI • Purpose • Fiber Distributed Data Interface I & II • High Capacity LAN – fiber based, twisted pair • High speed backbone to interconnect LANs • Cost effective • Dual ring concept – one ring – backup • Can be extended to 200km updated 12/2001

  3. FDDI • Topology • Station can be connected on 2 rings or 1 ring • Dual Attachment Station – Class A • Single Attachment Station – Class B • Wiring Concentrator updated 12/2001

  4. FDDI • Topology updated 12/2001

  5. FDDI • Layers • Data Link layer • Logic Link control • MAC layer • Token handling • Error checking • Data link Addressing updated 12/2001

  6. FDDI • Layers • Physical Layer • Physical sub Layer – PHY • Coding clocking, data framing – independent of physical medium • Physical Medium Dependent – PMD • Power level control, cables, connections etc updated 12/2001

  7. FDDI • Layers • Station Management – SMT • Spans MAC and PHY (full) • Node configuration • Ring initialization • Connection management • Error Detection & recovery updated 12/2001

  8. FDDI • PDUs • FDDI frame – a number of fields • SD- Start Delimiter • FC – Frame control – type of frame • DA, SA – Destination and Source Addresses • I – User Information • FCS – Frame Check Sequence • FS – Frame Status • ED – End delimiter updated 12/2001

  9. FDDI • Other Aspects • FDDI backbone interconnect • As a MAN – extended distance • Bridges, routers • FNS updated 12/2001

  10. FDDI • Other Aspects • FDDI vs ATM • FDDI II – very slow progress • Issues on twisted pair use updated 12/2001

  11. FDDI • Conclusions • Dual Ring protocol • Self healing capability • Can not Scale well – Broadband ? Gigabits? • Limited capacity updated 12/2001

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