is there a need for the Plugable USB 3.0 to 10/100/1000 Gigabit Ethernet Adapter if connecting a Surface Pro 3 to the Plugable UD3900

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Hi Jan,

Thanks for posting your question here! Plugable UD-3900 has a Gigabit Ethernet port. Hence you would not require to connect a Plugable USB3-E1000 for wired Ethernet connectivity if Plugable UD-3900 is connected to the Surface Pro 3.

Hope the above information helps! If you need any additional information, please do feel free to shoot us an email at support@plugable.com. We are here to help!

Regards,
Roze