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Measurement and Simulation of Differential Skew in Twisted Pair Cables

机译：双绞线电缆差分偏斜的测量和仿真

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The impact of manufacturing tolerances on unbalances in various individually screened twisted pair cables is discussed in this paper. Unbalances were grouped under categories which originate from geometrical, conductance or dielectric asymmetry of the pair. The concept of quasi-common and quasi-differential modes of propagation and modal dispersion in an unbalanced pair is discussed. It is demonstrated that the geometrical asymmetry is the least harmful for the quality of propagation on an unbalanced pair. Three different samples of cables each with low- and high-skew pairs were selected for laboratory tests. The differential skew (intra pair skew) were measured directly with a Network Analyzer and a power splitter. Measurements were also performed on the conductor-screen loop to find out the difference in primary unit parameters (inductance, resistance, capacitance) within each screened pair. Simulation and measurement results lead to similar conclusions regarding the correlation between unit parameter unbalance and intra pair skew.
机译：本文讨论了制造公差对各种单独筛选的双绞线电缆中的不平衡的影响。在分类下分组不平衡，该类别源自该对的几何，电导或介电不对称。讨论了在不平衡对中的准常见和准差分模式和模态分散的概念。结果表明，几何不对称是对不平衡对的传播质量的最不危害。选择具有低偏斜对的三种不同的电缆样品进行实验室测试。用网络分析仪和功率分配器直接测量差分偏差（帧内偏斜器）。在导体屏幕环路上还执行测量，以找出每个屏蔽对内的主单元参数（电感，电阻，电容）的差异。模拟和测量结果导致关于单元参数不平衡和帧内对偏斜之间的相关性的类似结论。

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