Multiplex communications – Fault recovery – Bypass an inoperative switch or inoperative element of a...
Reexamination Certificate
2008-04-29
2008-04-29
Kizou, Hassan (Department: 2619)
Multiplex communications
Fault recovery
Bypass an inoperative switch or inoperative element of a...
C370S225000
Reexamination Certificate
active
07366091
ABSTRACT:
The object of the invention is to introduce an advanced method and arrangement for changing parallel data transmission connections in an assured data transmission link. According to the method of the invention, the transmission path to be received is changed, prior to the passage of errors, and the data transmission of the link remains free of errors, in case even one of the transmission paths transmits the data as error-free, even if errors occur in other paths. The error-free quality of the link is maintained also when error-free and erroneous data transmission paths are suddenly exchanged. This is realised by calculating, in the parallel outdoor units (OU) located in succession to the common indoor unit (IU), a check sum for the transmission paths, for the data located in the interval under observation, said check sum enabling error correction; by checking the correctness of the data in the receiving outdoor units or by correcting small correctable errors; and by selecting, in the receiving indoor unit, on the basis of a quality factor describing the error-free quality of paths, another more error-free transmission path, in case for instance weather conditions cause errors in the currently employed connection.
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Andreas Iselt, “A New Synchronization Algorithm for Hitless Protection Switching in ATM Networks”, Munich University of Technology (TUM), Institute of Communication Networks (LKN), pp. 370-376.
Andreas Iselt, “A New Synchronization Algorithm for Hitless Protection Switching in ATM Networks”, Munich University of Technology (TUM), Institute of Communication Networks (LKN), pp. 370-376, no update.
Lahti Harri
Torvinen Marko
Harrington & Smith PC
Kizou Hassan
Nokia Corporation
Zhu Bo Hui A
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