Multiplex communications – Wide area network – Packet switching
Patent
1985-02-22
1988-09-06
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 89, H04J 300
Patent
active
047698390
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention broadly relates to Local Area Networks and, more specifically, pertains to a new and improved method and arrangement for transmitting data in a data loop having at least two successively arranged stations.
Generally speaking, the method of the present invention is for transmitting data in a data loop having at least two successively arranged stations optionally provided with peripheral devices, at least one of which is an overriding master station, and comprises the steps of: generating in the overriding master station transmission frames for data to be transmitted; the step of generating transmission frames entailing generating transmission frames which are partitioned into time slots, preferably equally great time slots, and with a predetermined constant number of clock cycles; and this step of generating transmission frames also entailing generating transmission frames for containing successive data to be transmitted in mutually immediate succession such that the termination of each transmission frame of the transmission frames is followed by the beginning of a subsequent transmission frame of the transmission frames.
The arrangement of the present invention is for transmitting data in a data loop wherein the data loop comprises at least two stations interconnected by a data transmission medium, such as cables, transmitter devices, optical conductors, electrolytes or the like, forming a closed loop, at least one station of the at least two stations being an overriding master station, the overriding master station comprising a generator for generating transmission frames, the at least one overriding master station comprising a transmitter device for entering the transmission frames into the data loop or into the medium interconnecting the at least two stations; the data transmission medium conducting the transmission frames through all stations and back to the overriding master station; each station of the at least two stations, inclusive of the at least one overriding master station, comprising a receiver device for the transmission frames, a synchronization device and at least one input-output device or input-output device port; each station being associated with at least one peripheral device; each input-output device or input-output device port serving selectively either for transferring data being transmitted and contained in a predetermined data-receive position in each transmission frame to the peripheral device or for inputting data to be transferred from the peripheral device into a predetermined data-transmit position in each transmission frame; the data loop defining a direction of data transmission; and each station comprising a transmitter unit arranged subsequent to the input-output device or input-output device port in the direction of data transmission for transferring or entering transmission frames into the data transmission medium, possibly with the data to be transmitted in altered form.
Data networks normally have the form of "point to point" connections between nodes or points of intersection or, alternatively, the form of several stations, only one of which is permitted to transmit at one time, are simultaneously connected to one common data transmission medium (cable, radio.) Information is normally serialized and transferred or transmitted in blocks or packets. Communication between stations is always regulated by a network-specific protocol or set of procedural rules. Such protocols are, for instance, X.25 of the CCITT, Ethernet, ISO-P 802 and the like.
With the exception of time-segmented or multiplexed connections or circuits, the transmission of data requires the control of network access or priority arbitration, which calls for a certain expenditure of time and is done on the basis of addresses and arbitration priority codes contained in the transmission framing. This, for instance, is also the case in the German Patent Publication No. 2,612,311 which describes a comparable device.
Each transfer unit or each transmission fra
REFERENCES:
patent: 3755786 (1973-08-01), Dixon et al.
patent: 3919484 (1975-11-01), Maxemchuk
patent: 3921137 (1975-11-01), McClearn, Jr. et al.
patent: 4460994 (1984-07-01), Scanlon et al.
Article from the publication entitled "Telecommunications and Radio Engineering", vol. 36/37, Feb. 2, 1982 issue.
Article entitled "Optical Fibers Ring System of Digital Channels", by V. V. Abramov et al., pp. 110 through 112.
Article entitled "A Local Network for Experiment Support", pp. 356 through 362, by J. A. Davis et al., excerpted from the Proceedings of the National Electronics Conference, vol. 36 (1982), held in Oak Brook, Ill.
Buschbeck Frank
Lindner Manfred
Preineder Hans
Querasser Edwin
Chin Wellington
Kleeman Werner W.
Olms Douglas W.
Ostereichisehes Forschungszentrum Seibersdorf G.m.b.H.
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