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FDDI

FDDI. Fiber Distributed Data Interface By Ya’kob , Aidid & Fikri. Introduction. The best before Fast Ethernet & Gigabit Ethernet Product of American National Standards Institute Specifies a 100mbps token-passing, dual-ring LAN using fiber optic cable.

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FDDI

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  1. FDDI Fiber Distributed Data Interface By Ya’kob, Aidid & Fikri

  2. Introduction • The best before Fast Ethernet & Gigabit Ethernet • Product of American National Standards Institute • Specifies a 100mbps token-passing, dual-ring LAN using fiber optic cable. • Used as high-speed backbone technology before this. • CDDI is another slower version.

  3. Traffic on this dual ring architecture flows opposite direction • One is primary & one is secondary • Uses primary ring during normal operation & the secondary is idle. Secondary is ready for backup. • Purpose : provide superior reliability and robustness

  4. FDDI is a standard for data transmission in a LAN that can extend in range up to 200km. • FDDI protocol is based on the token ring protocol • Supports thousands of users. • Fiber optic medium Dual-attach FDDI Board

  5. Access Method : Token Passing • A Station may send as many frames as it can within its task access period, with the proviso that real-time data be sent 1st • Two type of data frames : • 1. Synchronous (S-frames) : information is real times • 2. Asynchronus (A-frames) : information that is not real-times • Each station that captures the token is required to send S-frames first. • Any remaining time may the be used to send A-frames.

  6. Adressing • FDDI uses a six-byte address, which is imprinted on the NIC card similar to Ethernet addresses. Data Rate • FDDI supports data rates up to 100mbps

  7. Implementation: Dual Ring

  8. Thank You

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