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ADSL业务中线路衰减的参考值是多少?

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正确答案:

答:衰减与线路长度, 线径,绝缘材料,纽绞, 电气连接, A/B 线对地阻抗一致性有关。

对于 0.4mm线径的塑料介质电缆,可以参考下面的值:

1000 米 下行通道衰减 20dB,上行通道衰减 14dB。

2000 米 下行通道衰减 40dB,上行通道衰减 25dB。

3000 米 下行通道衰减 56dB,上行通道衰减 36dB。

答案解析:

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