Token-ring-type local area network
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United States of America Patent
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Dec 28, 1993
Grant Date -
N/A
app pub date -
Dec 28, 1990
filing date -
Dec 28, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a token-ring-type local area network (LAN), a plurality of communication nodes are linked together into a ring by a transmission path, onto which a token used for obtaining a transmission right is circulating through and a frame carrying data is transferred through. Herein, the token has a first memory area for memorizing a ring priority, while the frame has a second memory area for memorizing a reservation priority corresponding to a data priority of the data owned by each communication node. When a current communication node receives the token, the frame is generated and transmitted therefrom without transmitting the token if the data priority is higher than the reservation priority. When the current communication node receives the frame, the data priority of the current communication node is written into the second memory area of the frame if the data priority is higher than the reservation priority. Transmission of the frame is stopped and thereby a new token is generated having the reservation priority of the frame when the data priority of the current node is lower than the reservation priority of the frame which is now transmitted from the current node and then recovered by the current node. Preferably, the frame of data can be transferred in the LAN based on the frame-division manner.
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