I read this post and called Yamaha and I have answers for you.
You want to go to a store and buy an ethernet wireless adapter for your particular router. This way you don't have to use up your one USB device port. Just like the 3000, you can plug a USB adapter in here but then you have USB speed rather than ethernet speed and you give up your device port for thumb drives, etc.
If Yamaha is sending you an ethernet cable/adapter which they use to give 3000 and tyros customers, you don't want to use this because it will still go into the usb device port.
Either use a long ethernet cable or buy the ethernet wireless adapter for your router.
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George Kaye
Kaye's Music Scene
Reseda, California
818-881-5566
www.kayesmusicscene.com