Abstract: Method and system for determining data transfer margins and/or bit rates for network connections, the physical length of a network connection between a transmitter and receiver being known. A power spectrum is measured depending upon transfer frequency for possible modem types. Attenuation, and thus actual signal strength, is determined for different physical lengths and cable wire thicknesses of the network connection. Noise level is determined at least depending upon crosstalk parameters, number of interference sources, and equalizer factors based on the power spectrum. The data transfer margins are determined for different data transmission modulations and/or modulation codings for a pre-defined bit rate, based on the actual signal strengths and corresponding noise levels, by a Gaussian transformation module. The data transfer margins are corrected by a correction factor containing average deviation of the stored data transfer margin with respect to the actual data transfer margin.

Abstract: The invention relates to a method and a system for determining data transfer margins and/or bit rates for network connections, the physical length (13) of a network connection (12) to be determined between an emitter (10) and a receiver (11) being known. A power spectrum is measured according to the transfer frequency for possible modem types (101, 102, 103, 104) by means of a power measuring device (20). The damping and thus the effective signal strength is determined for different physical lengths (13) and cable core thicknesses (141, 142, 143, 144) of a network connection (12). Furthermore, the noise level is determined at least according to crosstalk parameters, the number of interference sources and equaliser factors based on the power spectrum.

Abstract: Method and device for classifying network connections based on geographical coordinates of a transmitter and a receiver of a network connection to be classified. By a calculating unit, one or more distance factors are determined, the distance factors indicating actual network connection length according to air distance. An attenuation distribution factor is determined based on known data of network connections, indicating the ratio of attenuation of different partial connection elements of a network connection in relation to one another. Further, data transfer margins are determined to calculate maximum data throughput rates for different modem types. Based on the actual connection length, the attenuation distribution factor, and the data transfer margin, the network connection is classified, according to its maximum throughput rate, by the calculating unit. In particular, the method can be applied to networks based on copper-wire connections, for example the last mile in telephone networks.