Patent CZ-302246-B6 (CZ)
Title: Method and system for determining data transfer margins for network connections
Inventor: PYTHOUD FREDERIC
IPC: H04M11/00
Filed: 2001-11-15
Abstract: In the present invention, there is disclosed a method for determining data transfer margins for network connections where a physical length (13) of a network connection (12) to be determined between a transmitter (10) and a receiver (11) being known, said method comprising: measuring a power spectrum by a power measuring device (20) in dependence upon a transfer frequency for possible modem types (101, 102, 103, 104), and transmitting the measured power spectrum onto a data carrier of a calculating unit (30); determining, with the calculating unit (30), attenuation for different physical lengths (13) and cable wire (141, 142, 143, 144) thicknesses of the network connection (12), and storing actual signal strengths at the receiver (11), based on the attenuation and the measured power spectrum, assigned to the respective physical lengths (13) and cable wire (141, 142, 143, 144) thicknesses, into a first list on the data carrier of the calculating unit (30); storing, in a second list, noise level (40), assigned to the respective physical lengths (13) and cable wire (141, 142, 143, 144) thicknesses of the network connection (12), on the data carrier of the calculating unit (30), the noise level (40) being determined by the calculating unit (30) based on the power spectrum, depending upon at least crosstalk parameters and number of interference sources; determining, by a Gaussian transformation module (31), in the calculating unit (30), 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 (13) and cable wire (141, 142, 143, 144) thicknesses of the network connection (12), on the data carrier of the calculating unit (30); determining, in the calculating unit (30), 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 (13) and cable wire (141, 142, 143, 144) thicknesses of the network connection (12), on the data carrier of the calculating unit (30), 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 (13) of the network connection (12) to be determined between the transmitter (10) and the receiver (11), in the calculating unit (30), the data transfer margin for the respective network connection (12). The present invention also relates to a method for determining bit rates for network connections wherein a physical length (13) of a network connection (12) between a transmitter (10) and a receiver (11) is known; computer program products by means of which the steps of both the methods are carried out as well as a system for making the above-described method.