TAILIEUCHUNG - Fiber Optics Illustrated Dictionary - Part 37

The Fiber Optics Illustrated Dictionary - Part 37 fills a gap in the literature by providing instructors, hobbyists, and top-level engineers with an accessible, current reference. From the author of the best-selling Telecommunications Illustrated Dictionary, this comprehensive reference includes fundamental physics, basic technical information for fiber splicing, installation, maintenance, and repair, and follow-up information for communications and other professionals using fiber optic components. Well-balanced, well-researched, and extensively cross-referenced, it also includes hundreds of photographs, charts, and diagrams that clarify the more complex ideas and put simpler ideas into their applications context | Fiber Optics Illustrated Dictionary FDDI is packet-switched based upon token-passing technology with multiple frames travelling the ring at the same time . a dual-ring network with a primary and a secondary ring. On most configurations the primary ring is used for data communications and the secondary ring is used as a backup. A concentrator is typically used as an attachment point with dual attachment stations DASs attached to both of the rings. FDDI is typically used on local area networks LANs with fiberoptic lines such as campus backbones. Two types of fiber optic cable are typically used singlemode and multimode. FDDI supports synchronous and asynchronous transmissions transmits over fiber optic cables to distances of about 200 kilometers and can service about 1000 individual workstations depending upon the topology. The specified wavelength is 1300 nm for data transmission. Short hops within the network may be handled by twisted-pair copper wires. FDDI has a theoretical maximum speed of about 1 2 million packets per second however with padding and various other factors achieved speed in commercial implementations is about one third of this. There are four documents associated with the FDDI architecture standard as shown in the FDDI Architecture Standard Documents chart. See A port Copper Distributed Data Interface Dual Attachment Station dual homing optical bypass. Fiber Distributed Data Interface II FDDI-II. A specification based upon FDDI for high bandwidth rates of up to 100 Mbps but enhanced to handle circuit-switched in addition to packet-switched PCM data for ISDN or voice in addition to data. FDDI-II supports both basic mode and hybrid mode transmissions and in hybrid mode it adds isochronous support to the asynchronous and synchronous services provided in basic FDDI. See Fiber Distributed Data Interface. Fiber Distributed Data Interface frame format The frame format for FDDI frames includes a data frame and a token frame. The data frame contains .

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