Reliability Analysis for FDDI Dual Homing Networks

Fiber Distributed Data Interface FDDI is a high-speed, fiber-optic token network consisting of two counter-rotating rings. In addition to the fault tolerant level provided by the dual rings, the reliability of an FDDI network is enhanced by the use of station bypass switches or concentrators CONs. A station equipped by a bypass switch is switched out of the ring when the station experiments a power failure. A CON facilitates the connection of stations to the ring and also switches out of the ring any faulty station connected to it. The use of reliable CONs to interconnect stations is the heart of the dual homing configuration.