Patent ID: 7388945
Filing Date: 2008-06-17
Classification: H04L

Abstract:
1. A method for determining data transfer margins for network connections, a physical length of a network connection to be determined between a transmitter and a receiver being known, comprising: measuring a power spectrum by a power measuring device in dependence upon a transfer frequency for possible modem types, and transmitting the measured power spectrum onto a data carrier of a calculating unit; determining, with the calculating unit, attenuation for different physical lengths and cable wire thicknesses of the network connection, and storing actual signal strengths at the receiver, based on the attenuation and the measured power spectrum, assigned to the respective physical lengths and cable wire thicknesses, into a first list on the data carrier of the calculating unit; storing, in a second list, noise level, assigned to the respective physical lengths and cable wire thicknesses of the network connection, on the data carrier of the calculating unit, the noise level being determined by the calculating unit based on the power spectrum, depending upon at least crosstalk parameters and number of interference sources; determining, by a Gaussian transformation module, in the calculating unit, data transfer margins for a predefined bit rate based on the actual signal strengths of the first list and corresponding noise level of the second list for different data transmission modulations and/or modulation codings, and storing the data transfer margins, assigned to the respective physical lengths and cable wire thicknesses of the network connection, on the data carrier of the calculating unit; determining, in the calculating unit, based on the stored data transfer margins, the actual data transfer margins by at least one correction factor and storing the actual data transfer margins, assigned to the respective physical lengths and cable wire thicknesses of the network connection, on the data carrier of the calculating unit, the correction factor comprising an average deviation of the stored data transfer margins with respect to the actual data transfer margins and/or an equalizer factor for correction of equalizer adjustment; and determining, based on the stored actual data transfer margins, with reference to the known physical length of the network connection to be determined between the transmitter and the receiver, in the calculating unit, the data transfer margin for the respective network connection.