电线电缆网 > 通讯电缆 > IEC 61156-5 为什么找不到NEXT标准公式?（完整版）

IEC 61156-5 为什么找不到NEXT标准公式? - 无图版

xyjilo --- 2012-10-29 15:01:43

1

如题,只有功率合公式,没有找到NEXT公式,请问哪里有?
h20050967 --- 2012-10-29 15:33:04

2

IEC 61156-1有，NEXT=10LOG10(P1N/P2N),知道公式，也没有太多实际作用
Beltriem --- 2012-10-31 09:06:06

3

原文如下：

The worst pair power sum near-end crosstalk, PS NEXT, at all frequencies, f, in the frequency range indicated inTable 6 shall not be less than the value abtained from Equation (6) useing

                 PS NEXT(f)=PS NEXT(1)-15*log10(f)     (6)

For those frequencies where the calculated value of  PS NEXT is greater than 75 dB,the requirement shall be 75 dB.

The minimum pair-to-pair NEXT for any pair combination shall be at least 3 dB better than the PS NEXT for any pair.

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