17 September 1987 Access Protocol For An Industrial Optical Fibre LAN
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Proceedings Volume 0734, Fibre Optics '87; (1987); doi: 10.1117/12.937996
Event: Sira/Fibre Optics '87, 1987, London, United Kingdom
Abstract
A structure for OSI levels 1 and 2 of a local area network suitable for use in a variety of industrial environments is reported. It is intended that the LAN will utilise optical fibre technology at the physical level and a hybrid of dynamically optimisable token passing and CSMA/CD techniques at the data link (IEEE 802 medium access control - logical link control) level. An intelligent token passing algorithm is employed which dynamically allocates tokens according to the known upper limits on the requirements of each device. In addition a system of stochastic tokens is used to increase efficiency when the stochastic traffic is significant. The protocol also allows user-defined priority systems to be employed and is suitable for distributed or centralised implementation. The results of computer simulated performance characteristics for the protocol using a star-ring topology are reported which demonstrate its ability to perform efficiently with the device and traffic loads anticipated within an industrial environment.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John M. Senior, William M. Walker, Alan Ryley, "Access Protocol For An Industrial Optical Fibre LAN", Proc. SPIE 0734, Fibre Optics '87, (17 September 1987); doi: 10.1117/12.937996; https://doi.org/10.1117/12.937996
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KEYWORDS
Local area networks

Stars

Stochastic processes

Optical fibers

Fiber optics

Computer simulations

Reliability

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