每个设备有两个网口，利用空闲对（4,5和7,8)供电，每个网口的空闲对是连起来的，然后设备与设备之间用网线菊花链连接，每个设备上有PD芯片，当把几个设备连好后再接到PSE上就无法供电，单个设备接PSE是可以供电的，请问有没有什么好的解决办法
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