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. 07, 1992
Filed:
Mar. 08, 1990
Rudolf Krumenacker, Munich, DE;
Werner Nagler, Hohenschaeftlarn, DE;
Rostislav Kaderka, Germering, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
Terminal groups are connected to a central switching matrix network via time-division multiplex lines and each comprises a switching matrix sub-network and a group controller which are assigned to one another in pairs. In addition to the connection equipment that are individually assigned to the one and to the other of the two terminal groups and that are respectively connected to the switching matrix sub-network of its own terminal group via internal lines during normal operation and that are switchable to the switching matrix sub-network of the respective other terminal group, the time-division multiplex lines individually extending from the central switching matrix network to each of the terminal groups are also switchable from their own terminal group to the respective partner terminal group. Given switch-over operation, in order to make the dial character receivers and call progress tone generators of a terminal group accessible to the internal lines and time-division multiplex lines of the respective other terminal group which is in the switch-over mode, voice memories working for both transmission directions are respectively doubled in the switching matrix sub-network. Call-associated PCM subinformation are always written into both switching matrix sub-networks in concurrent time slots. Reading is always carried out only from that voice memory that is respectively identified by corresponding, call-associated data in the holding memory.