Token-ring-type local area network
US5274637A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1990 |
| Grant date | Dec 28, 1993 |
| Priority date | — |
| Expiry date | Dec 28, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2012/6464
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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 …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.