Abstract
This paper proposes a new high-performance LAN/MAN scheme, called TTNET, based on a dual unidirectional fiber-optic slotted bus architecture (see Fig. 1) and a multimode access control protocol. Each station is connected to each bus through an active tap. With the change of voltages, a station may either receiver the optical signal, modify it, and then retransmit it, or sense the signal without breaking the optical path continuity. TTNET uses the combination of an implicit token passing (called the train) and an explicit token passing schemes as its access control protocol. Within a cycle, the access of a bus, say bus A, is controlled by both the train passing downstream on bus A, and the token passing upstream on bus B. The train of a subsequent cycle is triggered by the arrival of the used token of the previous cycle. Similarly, the token of a subsequent cycle is triggered by the arrival of the end of the train of the previous cycle.
© 1992 Optical Society of America
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