The Fiber Distributed Data Interface

A bit error rate of 2.5E-10 is specified for a ring implementation. In order to provide increased fault tolerance, dual counterrotating ring configurations are possible. When this configuration is used, each ring (one primary and one secondary) operates at 100 Mbps over separate paths. In this dual ring implementation, there are two dual-fiber cable connections attached to each node. The first dual fiber cable connection carries the incoming signal for the primary ring and the outgoing signal for the secondary ring. The second connection carries the outgoing signal for the primary ring and the incoming signal for the secondary ring. Normal traffic uses the primary ring; the secondary ring is redundant and is used for fault recovery.

Two types of network stations (nodes) can be used under FDDI: class A and class B

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to transmitting data, while ATM can transmit multimedia information. As a result, the packet format for FDDI is long and variable, while the packet format for ATM is short and fixed. ATM has no top speed, while FDDI is currently limited to 100 Mbps (although multiple FDDIs can be used to overcome this limitation). FDDI's primary advantages are that it has been tested and proven effective, and that no single point of failure can block its performance. ATM's primary advantages are that wide area ATM's are being developed, and that it is best suited for the rising interest in multimedia transmission. FDDI's primary disadvantages are that its bandwidth degrades and that there are distance limits to the rings themselves. ATM's primary disadvantages are that switches can block it and that the vendor interoperability, a key factor in network management, is currently untested. The prices for both protocols are falling (Kerr, 1993, p. 30; Hurwicz, 1993, p. 31). FDDI is popular among large corporations, including Coors Brewing Company, General Motors, Martin Marietta and Mitsubishi International. Applications for the protocol are varied across organizations, but the government agency in charge of Italy's national highway system pr
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Some common words found in the essay are:
Mbps LANs, FDDI LAN, Copper FDDI, California Programs, International Applications, Company Hurwicz, ATM FDDI, Sprint Communications, Interface FDDI, fiber optic, 1993 31, Institute ANSI, primary ring, secondary ring, shoemake 1993 31, hurwicz 1993, optic cable, fault tolerance, shoemake 1993, class class, class stations, fiber optic cable, fiber optic fddi, signal primary ring, class nodes connect,
Approximate Word count = 1647
Approximate Pages = 7 (250 words per page)

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