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:
Nov. 06, 1979
Filed:
Sep. 12, 1977
Hitachi, Ltd., both of, JP;
Nippon Telegraph and Telephone Public Corporation, both of, JP;
Abstract
A communication control system comprises a communication control unit and a line control unit coupled to it. The former communicates with a data processor and the latter communicates with a plurality of modems. A first address signal generator in the communication control unit sends an address signal to a first decoder in the line control unit, allowing it to select one of the line adapters in the line control unit and, therefore, one of the modems coupled to the line adapter. The selected line adapter sends a signal and data if any to the communication control unit, which send a signal and data, if any, to the line control unit in response to a signal or data sent from the line control unit. A second address signal generator in the communication control unit begins to send a little later the second address signal which is the same as the first address signal to a second decoder in the line control unit, allowing it to select the same one of the line adapters as one previously selected by the first decoder. The line adapter selected by the second decoder can receive a signal and data if any, sent from the communication control unit. At the time when the signal and data are received by the line adapter selected by the first decoder, the first decoder has selected the next line adapter, because the next first address has already been sent by the first address generator. Thus, the communication control unit selects two of the line adapters at the same time allowing one to send signal and data to the communication control unit and allowing the other to receive signal and data sent from the communication control unit in response to the signal and data already sent from the line control unit.