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:
Jun. 10, 2008
Filed:
Aug. 23, 2004
Michael Koestner, Karlsruhe, DE;
Harald Thrum, Stutensee, DE;
Michael Koestner, Karlsruhe, DE;
Harald Thrum, Stutensee, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A local network, particularly an Ethernet network having redundancy properties, in which coupling devices (K, K, K) and a redundancy manager (RM) are interconnected in a ring-shaped topology. The redundancy manager opens the ring to create a linear topology if test messages (T, T) emitted by the redundancy manager (RM) are received at the other port (P, P) within a given period of time, otherwise the redundancy manager (RM) closes the connection. As a so-called redundancy manager observer, at least one of the coupling devices (K) is configured such that it evaluates messages received at the port (P) thereof, the port (P) being connected to the redundancy manager, opens the ring to create a linear topology, and signals an error if more than initial test messages (T) have been received at this port (P) and if the status 'ring opened' has been indicated by the redundancy manager (RM) in the last-received initial test message (T), whereby messages are prevented from circulating on the ring.