SRL Prediction

Prediction of the Structural Return Loss

Display of the SRL forecast on ECOCONTROL 2000

Structural Return Loss (SRL) means that at the transmission of signals of a conductor, for specified transfer rates respectively transfer frequencies, losses occur due to reflections. The attenuation of the signal amplitudes through reflection is defined as Structural Return Loss. The Structural Return Loss within the transmission range should generally not be higher than 5 % for a manufactured conductor.

For the quality control of data and high-frequency cables SIKORA measures the SRL of a cable length as a function of the operating signal frequencies, which are later to be transferred to the cable. The Structural Return Loss represents the relation between the provided signal and the reverse reflected signal parts along the full cable length to the input.

In order to optimize the cable quality as well as to reduce scrap it desirable to detect impacts of periodic irregularities on the later SRL of the manufactured cable at an early stage.

The online prediction of SRL from short-term cable capacity data provides appropriate information. This prediction method is based, especially with regard to online demands on the Fourier-Transformation according to the FFT-Algorithm.