| 摘要 |
The invention relates to a method as well as a respective device for monitoring the quality of data transmission over analog lines, with the data being transmitted as signals by using wavelengths ( lambda 1 - lambda 4) and with at least one wavelength ( lambda 1 - lambda 4) to be monitored on a monitoring path. To provide a simple, reliable way of evaluating the quality of the signals transmitted, the method comprises the following steps: decoupling a fraction of the signals of each of the wavelengths to be monitored, at the starting point of a monitoring path; forming a monitoring signal which depicts the sum of the intensities of the decoupled signals; transmitting the monitoring signal formed, with an additional wavelength ( lambda 5); at one monitoring point of the monitoring path provided for this purpose, renewed decoupling of a fraction of the signals with the wavelengths ( lambda 1 - lambda 4) to be monitored, as well as decoupling at least a fraction of the monitoring signal; and evaluating the signals decoupled at the monitoring point in respect of any change between the sum of the intensities of the signals with the wavelengths ( lambda 1 - lambda 4) to be monitored, at the starting point of the monitoring path and at the monitoring point.
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