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. 22, 1977
Filed:
Apr. 18, 1974
Franz Fahrenschon, Neuried, DT;
Horst Jager, Munich, DT;
Hans Thinschmidt, Unterpfaffenhofen, DT;
Alfred Meier, Munich, DT;
Siemens Aktiengesellschaft, Berlin & Munich, DT;
Abstract
Apparatus is described for telecommunication facilities having transmission paths capable of accommodating different types of message switching, e.g., voice communications and data communications. A changeover device in the subscriber stations in the system switches between the two modes of communication by means of a mode selector switch for causing manual or automatic switching between the two forms of communication. After switching through a call carried by a given connector set, a signal is automatically sent from the connector set to the called subscriber station. This signal causes an automatic changeover from the form of message communication being used to a second form, e.g., from voice to data. Upon completion of the changeover in the called subscriber station, acknowledgement of this fact is made by sending a back signal from the called station. Responsive to this acknowledgement, a signal is likewise sent to the calling subscriber station. This signal automatically effects a changeover in the calling station to the desired mode of message transmission, and this changeover is likewise acknowledged by a back signal. The changeover is reported to both subscriber stations participating in a call as an inquiry for acceptance of the desired message switching.