ibm-information-center/dist/eclipse/plugins/i5OS.ic.rzajt_5.4.0.1/rzajtrzajtddicon.htm

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<title>Distributed data interface network</title>
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<h4 id="rzajtddi-con">Distributed data interface network</h4>
<p>FDDI is an optical fiber-based local area network (LAN) that uses the American
National Standards Institute (ANSI) 3T9.5 standard for a token-passing ring
media access control (MAC) protocol. Stations, concentrators, and bridges
in a FDDI network are physically connected to one of the counter-rotating
rings or both of the counter-rotating rings. The rings operate at 100 Mbps.</p>
<p>FDDI networks allow devices to be attached to one or both of the rings.
Typically only the primary ring in a FDDI network is active. The secondary
ring is used to maintain the network when a dual-access station or a concentrator
becomes inactive.</p>
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