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您好,是的,DP83TD510E不支持多点multi drop通讯。
关于通讯距离,您可以参考这篇应用手册4.8 DP83TD510 Cable Reach Performance部分的介绍,因为不同cable在不同频率下的插值损耗是不同的,比如 要达到1000m或1200m距离,那么在10M频率下的插值损耗是不同的: