Importance

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Abstract

A local area network system which allows a plurality of subscriber terminals to communicate with each other via a central station, and a router unit therefor. Logical addresses assigned to the individual subscriber terminals and physical addresses associated therewith are previously registered to an address table. The central station receives transmission data from a first subscriber terminal, to which data a logical address of a second subscriber terminal is affixed. A physical address reading unit, as part of the central station, reads out a physical address corresponding to the received logical address by consulting the address table. When the received logical address was incorrect, the physical address reading unit cannot find the corresponding entry in the address table, and if that is the case, the received transmission data will be discarded. When the received logical address was found in the address table, the data transfer unit forwards the transmission data to the second subscriber terminal by using the logical address affixed to the received transmission data and the physical address that is read out by the physical address reading unit.

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First Claim