Connection Oriented Data Service in DQDB

Abstract In this paper, we present a comparison of two strategies which have recently been proposed for bandwidth allocation in Distributed Queue Dual Bus subnetworks of a Metropolitan Area Network. We study packet delays for connection oriented variable bit rate (VBR) traffic such as real-time data and compressed voice and video. It turns out that the Guaranteed Bandwidth Protocol is an excellent candidate for Connection Oriented Data Service in DQDB where support of delay sensitive VBR traffic is a major concern. In contrast to this, a modified version of the bandwidth balancing mechanism suffers from slow convergence to the desired bandwidth allocation. Additionally, it suffers from problems for network management.

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