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This paper investigates common-mode propagation in shielded twisted pair cables. The common mode exhibits great potential for improving the throughput in emerging wire-line systems. The design of corresponding transmission schemes over multi-pair copper cables requires accurate knowledge of the channel properties. The authors present measurement and modeling results and investigate the feasibility of using standard differential mode models for data fitting in multi-conductor transmission-line modelling of common-mode paths. During the last two decades, several families of Digital Subscriber Line (DSL) have been developed, standardized, and deployed.
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