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两个以太网PHY中间不用网络变压器能直接互联吗?



我在电路板上使用以太网PHY芯片DP83867和microchip公司的以太网交换芯片KSZ9477S(集成PHY)中间没有用网络变压器直接连接,这样可以吗?
中间还需要其它匹配电路,或是用电容耦合方式?