Patent ID: 6701086
Filing Date: 2004-03-02
Classification: H04B

Abstract:
A method for monitoring signal quality of a transmission signal in an optical data network independently from transmission layers, comprising the steps of:setting predetermined time intervals by a first measuring device at a beginning of a transmission path at a transmission side; measuring first signal quality values of data sequences of the transmission signal within said predetermined time intervals at the transmission side; determining durations of said predetermined time intervals based on a desired signal parameters of the data sequences, and generating time marks defining said predetermined time intervals; transmitting both time marks and first signal quality values via a service channel together with the transmission signal from the first measuring device over the transmission path to a second measuring device at a reception side; measuring second signal quality values of said data sequences within said predetermined time intervals, defined by received time marks, by the second measuring device such that coincidence of the predetermined time intervals appertaining to same data sequences is assured; and transmitting via the second measuring device at the reception side both the first signal quality values and the second signal quality values from the second measuring device to a central location, or evaluating the first signal quality values and the second signal quality values and transmitting the result to the central location.