Performance analysis of a dual bus reservation based fiber-optic network

In this paper, we present the performance of a dual bus reservation based (DBRB) access protocol, for high speed local and metropolitan area networks. The DBRB network consists of unidirectional dual bus topology of fiber optic cables. At each end there is a master station which generates a frame of slots. When a station wants to transmit, it has to make a reservation in a frame on one bus and waits for the free frame slots to transmit it´s packets on the other bus. Within a single frame, each station is allowed to reserve any number of slots up to a maximum number of reservations that is set by the protocol. A simulation program and an approximate analytical model were developed for performance evaluation of the DBRB-net protocol and to study the characteristics of DBRB-net. Through simulation and approximate analytic analysis, it was shown that DBRB-net performance is not limited by operating data rate, the network size or normalized propagation delay if the appropriate network parameters were chosen. A comparison between the performance of DBRB-net and other high speed networks (HSN´s) protocols proved that the DBRB has advantages of efficient throughput approaching unity for most practical configurations, low bounded delay, fair access for all nodes at different load, simplicity of the protocol, and implementation flexibility