Abstract
Today, accurate and low complexity modelling of secondary parameters of twisted copper pairs at high frequencies is necessary, especially for modern transmission systems. The newly presented G.fast subscriber technology can occupy frequencies up to 212 MHz. For the purpose of its performance evaluations as well as for quick and accurate estimations of its transmission channel, the possibilities for accurate twisted pair’s parameters approximation should be investigated. Basically, the motivation presented within this paper is to propose a completely new model for estimations of a propagation constant and its temperature dependence of twisted pairs and metallic cables suitable for G.fast frequencies. The main idea of a presented model is the innovative adoption of an inverse hyperbolic sine function in order to provide more accurate approximation of a propagation constant g(f) and its temperature character. The accuracy of a proposed model was verified for various metallic cables with different constructional arrangement and parameters. Based on the comparison of our proposed model with other typical existing models, the presented model outperforms the accuracy of all existing models using equal number of necessary parameters. DOI: http://dx.doi.org/10.5755/j01.eie.22.2.12448
Highlights
The future modern access networks will be surely based on optical fibres and optical access technologies [1], such as passive optical networks (PONs), optical Ethernet technologies, etc
This paper presented a new model of a propagation constant (f) of twisted copper pairs suitable for G.fast frequencies at least up to 250 MHz
The experimental results and comparisons presented within this paper clearly illustrate the accuracy of a proposed inverse sinh model, which generally outperforms the accuracy of existing KM1 model using equal number of k-parameters and in some cases it outperforms the G.fast reference model presented in ITU-T G.9701 rec
Summary
The future modern access networks will be surely based on optical fibres and optical access technologies [1], such as passive optical networks (PONs), optical Ethernet technologies, etc. The main motivation of this paper is to present a completely new innovative model of the propagation constant (f) and its temperature dependence suitable for G.fast frequencies. The aim is to propose a new model for quick and accurate approximation of a propagation constant (f) for various external temperature conditions with accuracy better than all existing transmission line models with equal number of necessary parameters. This innovative model is based on the application of an inverse hyperbolic sine function and thanks to that it can provide more accurate approximation of a propagation constant (f) typical character. The comparison of the accuracy of a proposed model together with several existing models performed for various typical metallic cables is presented in Section IV, while the discussion of the results is provided in the conclusion of this paper
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