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:
Dec. 20, 1977
Filed:
Jul. 09, 1976
Wernhard Markwitz, Munich, DT;
Volker Dumichen, Munich, DT;
Siemens Aktiengesellschaft, Munich, DT;
Abstract
A method is described for testing the transmission quality of a data transmission system in its operational state. During a test key actuation data bits having a specific marking polarity and at least one additional bit having a polarity corresponding to the spacing condition are transmitted. At a receiving station the latter transmitted bit group is analyzed for disturbances. In the event of multiple undisturbed reception of the aforementioned bit pattern a visual indication is produced. At the same time, in the receiving station, the data output of the receiver is connected to the transmitter, and the aforementioned bit pattern is transmitted back to the testing station. With multiple undisturbed reception of the bit pattern a visual indication is produced in the testing station. During the test procedure the data input and output units are blocked.