fddiThe optic fibre is distributed in interface of the data FDDI It is one of highest transfer rate in present ripe LAN technology. The standard that the high network technique up to 100Mb/s of this kind of transfer rate bases on is ANSIX3T9.5. This network has characteristic of the seasonal brand agreement definitely, support many kinds of topological structure, transmit the media as the optic fibre. Using optic fibre as and transmitting the media has many kinds of advantages: 1,The distance of longer transmission, the adjacent maximum length while standing can reach 2KM, a distance of maximum station is 200KM. 2,Have larger bandwidth, the design bandwidth of FDDI is 100Mb/s. 3,Inhibit ability to the interference of electromagnetism and radio frequency, are not influenced by electromagnetism and radio frequency noise in the course of transmitting.
do not influence its apparatus either. 4,Optic fibre can prevent from in the transmission course branching off, eavesdropping, stop the intersection of radiation and wave eavesdrop too, therefore is the safest transmission media. FDDI formed by optic fibre, its basic structure is a reverse pair of rings. A ring is a main ring, another ring is a spare ring. The apparatus at the main ring fails or when the optical cable breaks down, through can continue maintaining the normal work of FDDI from main ring to the switch of the spare ringing. The fault-tolerant ability of this kind of trouble is what other networks do not have. Put up with the basic component of FDDI in this issue, topological structure and operation principle,etc. make an introduction.
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