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:
Feb. 16, 1988
Filed:
Jan. 17, 1986
Masayuki Kawashima, Tokyo, JP;
Hideharu Omori, Hino, JP;
Iwatsu Electric Co., Ltd., Tokyo, JP;
Abstract
A time division multiplex telecommunications system is disclosed as adapted for a key telephone system providing for intercommunication between any two of a series of key telephone sets in cascade connection to a switching control circuit, possibly with facilities for association with the nationwide telephone network. The control circuit receives from the tandem connection of telephones an outgoing data signal of time division multiplex frame format having a succession of frames each comprising a frame sync signal and channels of outgoing data from the respective telephones. Rearranging the channels of data in the received outgoing data signal, the control circuits delivers back to the successive telephones an incoming data signal of similar frame format. Each telephone is equipped for rearrangement of the frame sync signal and data channels of the incoming and outgoing data signals, with the result that all the telephones can be of the same circuit configuration.