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I have recently set up a new computer with an Ethernet adapter that supports up to 1 Gbps. I have a 600Mbps optical fibre connection with a set of PLCs (TL-WPA4220KIT) to run a wired connection from the router to the computer. Both ends are connected by a Category 7 Ethernet cable.

When I try to change the speed and duplex of the adapter to 1 Gbps, the adapter becomes disabled and says that I do not have any cable plugged in.

Image of the adapter after changing the speed: Image of the adapter after changing speed, "Cable de red desconectado" means "Network cable disconnected." ("Cable de red desconectado" means "Network cable disconnected")

To make the Ethernet work again, I need to set the speed and duplex to another option that isn't the 1 Gbps one. The adapter is an Intel Ethernet Connection (7) I219-V. I am using Windows 10 Pro 64-bit.

Does anyone have any idea what the problem might be? I have looked in other posts but nothing has worked for me. Thank you for your help.

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    I wasn't sure what you meant by 'a set of PLCs' so I searched for the part number. What I found was a device that uses power lines to extend a network, and that doesn't support Gigabit Ethernet. Is this what you have?
    – CatchAsCatchCan
    Commented Jun 24, 2019 at 0:07

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The TP-Link TL-WPA4220KIT only supports up to 100Mbps Ethernet (100BASE-T), so by trying to force 1Gbps (1000BASE-T), transmission fails and the link drops.

Source: https://www.tp-link.com/us/service-provider/powerline-adapter/tl-wpa4220kit/#specifications

TL-WPA4220KIT Hardware Features

Even though the powerline adapter claims to support up to 300Mbps, that number refers to the theoretical maximum Wi-Fi link speed.

The adapter also suggests that it can transmit wired up to 600Mbps (AV600), but in practice, you would not get anywhere near that speed.

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