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High-performance optical local and metropolitan area networks: enhancement of FDDI and IEEE 802.6 DQDB

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2 Author(s)
Karol, M.J. ; AT&T Bell Labs., Holmdel, NJ, USA ; Gitlin, R.D.

The fiber distributed data interface (FDDI) and the IEEE 802.6 distributed queueing dual bus (DQDB) are emerging standards for high-speed (45-150-Mb/s) local and metropolitan area networks. The authors describe several ways to build on these emerging standards to significantly increase the achievable throughput and lower th e end-to-end delay. Without increasing the number of transceivers or their rate, substantial throughput increases are obtained by a highly concurrent logical interconnection pattern of user modes, and the end-to-end delay is decreased by the use of more efficient media-access techniques. The most promising architecture is a multiconnected ring having only two transmitters and two receivers per node, where each node needs to handle or process only a small fraction of the network traffic. In one example, the authors describe a 24-node, distributed, packet-switched network, with only two 100-Mb/s transmitters and two 100-Mb/s receivers per node; it has a maximum throughput of 1.5 Gb/s-15 times the 100/Mb/s throughput of FDDI. Such a system has the potential to be a follow-on standard to FDDI (or IEEE 802.6) or to provide a high-performance LAN/MAN that can interwork with standard systems

Published in:

Selected Areas in Communications, IEEE Journal on  (Volume:8 ,  Issue: 8 )

Date of Publication:

Oct 1990

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