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So I was looking at the back panel on the X1(XB1, Xbone...w.e) and I can not tell what the port next to Ethernet port is.
Looking at some of the pictures it looks like it says In Out... But it might be some kind of symbol or something next to the out.

Anyone have any ideas?

i think its for headphones which use optic cables.

It is a RF port for Remote controls for TV's or DVR boxes!