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F28M35H52C: Custom Ethernet Design(LAN8710A)

Part Number: F28M35H52C

Hello!

I designed a custom  device that uses the LAN8710A chip as the Phy, wanting to communicate the Ethernet protocol. I'm trying to communicate the device with another Ethernet device. The green led of the RJ45 turns off at startup,after 1-2 second  the orange led turns on and does not communicate. What do you think about the status of these leds? Why devices is not established?

Regards,