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:
Nov. 22, 2011
Filed:
Jun. 02, 2005
Anja Ackermann, Obermichelbach, DE;
Michael Festor, Heroldsberg, DE;
Frank Greiner, Erlangen, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A method for securely transmitting data messages in an HVDCT system. Each transmitting unit is connected to each receiving unit via at least two connection channels. Each data message includes a message counter that uniquely characterizes the data message, and each transmitting unit transmits the data message to each receiving unit via all of the connection channels. Each receiving unit calculates a comparison counter and compares it with the message counter in the received data message. If the message counter and the comparison counter do not match, a repetition request is transmitted to the transmitting unit for the purpose of transmitting a message counter that corresponds to the comparison counter. After the repetition request has been received, the transmitting unit accesses a transmission buffer, and the data message whose message counter corresponds to the comparison counter of the repetition request is transmitted via all of the connection channels.