The Fiber distributed data interface(FDDI )token ring protocol is a standard for 100 Mbit/s fiber optic token ring. It is one of the most important high speed LAN standard. The main characteristic for FDDI protecol is that it can support time-critical integrated applications such as voice and video transmission. This is based on two important theorems in the FDDI protocol. The purpose of this paper is to expand and prove these theorems when real-time signalling system is introduced into FDDI[1].
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