特定频率下的NEXT衰减极限频率(MHz)最小NEXT信道(100米)链路(90米)介质类别3类4类5类3类4类5类139.153.360.040.154.760.0429.343.350.630.745.151.8824.338.245.625.940.247.11022.736.644.024.338.645.51619.333.140.62135.342.32031.439.033.740.72537.439.131.2535.737.662.530.632.710027.129.3