Graduate Thesis Or Dissertation
 

A simple local area network, COLAN (Control Oriented Local Area Network)

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6682x671k

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  • COLAN (Control Oriented Local Area Network ) is a redesign of the Task-Master, a daisy-chain structure distributed control system. COLAN is a simple bus structure communication subnetwork intended for distributed control applications. Low cost and simplicity are two main design criteria. Point-to-point and broadcast communications are possible. A packet switching technique is employed for data communication. A fully distributed and "fair" channel access control protocol is developed for COLAN. It is a hybrid protocol which combines the CSMA/CD technique and the Token Bus technique. This control mechanism achieves high performance by changing between the CSMA/CD technique and the Token passing technique according to the load of the network. When the load of the network is light, COLAN employs the CSMA/CD technique. When the load is heavy, it uses the Token passing technique. It is believed that this hybrid control protocol will have a better performance than either the pure CSMA/CD technique, or the pure Token passing technique.
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