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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 4901313 B1

PDFFull Text
Date of Patent:
Feb. 13, 1990

Filed:

Jul. 27, 1988

A-point to multi-points communication system

Applicant:
Inventors:

Nobuyuki Fujikura, Kodaira, JP;

Hiroshi Morita, Yokohama, JP;

Yoshihisa Ikeda, Ibaraki, JP;

Ryoichi Sasaki, Fujisawa, JP;

Assignees:

Hitachi, Ltd., Tokyo, JP;

Hitachi Microcomputer Engineering Ltd., Tokyo, JP;

Attorney:

Antonelli, Terry & Wands

Primary Examiner:

Benedict V Safourek

Assistant Examiner:

Wellington Chin

Int. Cl.
CPC ...
H04J / ; H04J / ;
U.S. Cl.
CPC ...
3701041 ; 370 951 ;
Abstract

In order to improve the throughput of an a-point to multi-points information system having a master station for transmitting an a-point to multi-points frame and a plurality of slave stations for receiving the a-point to multi-points frame and to insure reliability of received information, the master station comprises a unit for detecting that the number of slave stations which are in abnormal receiving of an a-point to multi-points frame from the master station exceeds a predetermined value, and retransmits the a-point to multi-points frame received abnormally during the detection. When the slave stations are divided into a plurality of groups, the master station comprises a unit for detecting that the number of slave stations in each group which are in abnormal receiving of an a-point to multi-points frame from the master station exceeds a value which is predetermined for each group, and retransmits the a-point to multi-points frame after temporarily disconnecting slave stations in a detected group from the object to which the a-point to multi-points frame is transmitted from the master station.

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Quick Actions:

Fujikura, Nobuyuki. (1990). A-point to multi-points communication system (U.S. Patent No. 4901313). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4901313

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