3Com 3C780 User Guide - Page 164

Dual ring of trees FDDI Fiber-optic cable Gateway IP ISO Logical ring Glossary 3 One of the FDDI-supported topologies in which only one ring is permitted to have multiple trees of any depth (consisting of single-attached concentrators and stations), which are cascaded off the main ring. Fiber Distributed Data Interface. The local area networking standard that provides high bandwidth for interconnecting computers and peripheral devices using a fiber-optic medium in a ring configuration. The FDDI specification is made up of standards that correspond to the IEEE OSI model layers (on the physical and data link levels). These standards specify the physical interfaces, functions, and operations needed to support interoperability between devices. A fiber-optic cable consists of a glass center, cladding, a buffer layer, strength members, and a cable sheath. The glass center supports the transmission of light signals. A special-purpose, dedicated computer that attaches to two or more networks and routes packets from one to another. Internet protocol, which defines the Internet datagram as the unit of information passed across the Internet and provides the basis for the Internet connectionless, best-effort packet delivery service. International Standards Organization. The international agency that develops information-exchange standards implementation. A set of MACs serially connected to form a single ring. A fault-free FDDI network provides two logical rings.