On the NEXT and impulse noise properties of subscriber loops

K. Széchényi
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引用次数: 13

Abstract

The transmission range of subscriber loops carrying ISDN (integrated services digital network) signals with a net bit rate of 144 kb/s is limited mainly by the near-end crosstalk (NEXT) between cable pairs and by impulse noise transformed into these loops owing to their imperfect symmetry. In order to be able to predict this transmission range, a considerable amount of experimental and theoretical work was required prior to the introduction of ISDN for a better understanding of the cross-talk and noise phenomena in these loops. The author summarizes NEXT measurement results and modeling methods and reports on impulse noise measurements and the statistical models derived from them. Detailed results of swept-frequency measurements in different cables are considered. Measurement results indicate considerable variation in the density of impulse noises within 24 h, a hyperbolic distribution, interval distribution according to the sum of exponential functions, and steadily increasing amplitude density below 40 kHz.<>
用户环路的NEXT和脉冲噪声特性研究
承载净比特率为144kb /s的综合业务数字网(ISDN)信号的用户环路的传输范围主要受到电缆对之间的近端串扰(NEXT)和由于其不完全对称而转化到这些环路中的脉冲噪声的限制。为了能够预测该传输范围,在引入ISDN之前需要进行大量的实验和理论工作,以便更好地了解这些环路中的串扰和噪声现象。作者总结了NEXT的测量结果和建模方法,并报道了脉冲噪声的测量和由此得出的统计模型。考虑了不同电缆中扫频测量的详细结果。测量结果表明,脉冲噪声密度在24 h内变化较大,呈双曲线分布,按指数函数和的区间分布,在40 kHz以下振幅密度稳步增加。
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