A local area network ( LAN ) can be defined as an information transport system for data transfer among terminals, computer systems and peripheral equipment, via an interconnecting medium within the confines of a single building or cluster of buildings. The research developed a LAN system suitable for use in a teaching laboratory environment. The LAN system is versatile enough to allow easy connection of many different types of equipment while being relatively inexpensive. The network consists of microprocessor-based protocol interface units connected to a common twisted-pair cable. Each interface unit can support an asynchronous RS-232-C serial interface from user equipment into the LAN with standard speeds up to 9.6k bits per second. The interface units provide virtual circuit service for the attached user equipment via a CSMA/CD technique. The data rate on the network cable is 62-.5k bits per second, thus allowing several simultaneous, independent virtual circuits on the network.
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