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.:
Date of Patent:
Dec. 20, 1988
Filed:
Dec. 15, 1986
Yasuhiro Takahashi, Fujisawa, JP;
Kunio Hiyama, Fujisawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A communication system in which a plurality of terminal devices connected to a loop transmission line perform data transmission/reception in a time-division multiplexing manner by using a communication frame circulating the transmission line. The communication frame being constituted by a plurality of sub-frames, each including a plurality of time slots. Each of the terminal devices is arranged to perform data transmission/reception using a designated time slot in a designated sub-frame. All the sub-frames in the communication frame are allotted to a terminal device of a high capability of data transmission, while less than all of the sub-frames are allotted to a terminal device of a low capability of data transmission. A plurality of low speed terminal devices, to which sub-frames different from each other have been respectively allotted, commonly use a time slot of the same number, so that each of the time slots in the communication frame can be effectively utilized.