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:
Aug. 30, 1983
Filed:
Nov. 13, 1981
Fritz R Gfeller, Adliswil, CH;
Hans R Mueller, Langnau, CH;
International Business Machines Corp., Armonk, NY (US);
Abstract
A communication system in which many terminals located in a large room are connected to a host via a plurality of satellites. Data are exchanged between terminals and satellites by infrared signals. All satellites are connected to the host by a common bus arrangement comprising a data line (13) and a synchronization line (15). Each satellite generates a synchronized carrier and modulates it by the downlink data received from the host in a modulator (17). Each terminal may receive overlapping signals from several satellites without disturbance. Uplink data transmitted from any terminal are stored as packet in a buffer (55) of one or more satellites so that they can be transferred to the host subsequently via the bus arrangement. Each satellite has means (63) for comparing any transferred uplink packet to a packet still stored in its buffer so that any packet is transferred only once to the host and doubly stored packets are eliminated.