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:
Jan. 05, 1988
Filed:
Apr. 29, 1986
Ib N Andersen, Tr.ang.ngsund, SE;
Telefonaktiebolaget L M Ericsson, Stockholm, SE;
Abstract
The invention relates to a telecommunication system in which alternatingly circuit-switeched and packet-switched information is transmitted in time-divided form between transmitter and receiver equipments. A system is described for multiplexing telephony channels with static and dynamic capacity. A static channel occupies a time slot in a fixed frame structure. The dynamic channels utilize idle time slots. A status bit per time slot states whether the time slot is occupied or not. According to the invention, equipment for transmitting circuit-switched information is combined with equipment for transmitting packet-switched information, such that a hybrid system is obtained which, under the control of a status bit, alternatingly transfers information from the respective equipment in response to the polarity of the status bit. A circuit-switching memory (CS) is continuously scanned in a multiplexer (DS1). Data words are stored in the memory, each word corresponding to a time slot, which in turn corresponds to an information channel in a TDM system. A status bit of the mentioned kind is inserted in each data word. For an occupied time slot in the memory CS the word from the memory CS is transmitted to a circuit-switching receiver (CR) via a line (L) and a demultiplexer DS2. For an idle time slot in the memory CS sends the word which is first in the queue in a buffer memory PS included in a packet-switching connection and is transmitted to a packet-switching receiver PR via the line L.