When you set your Xbox 360 to a static IP address, the router does not know that the Xbox 360 is using that IP address. So the very same IP address may be handed to another computer or console later, and that will prevent both devices from connecting to the internet.
Mar 29, 2019
Jul 01, 2015
When you connect an Xbox 360 Wireless Networking Adapter to an Xbox 360 E console, the console automatically uses the wireless adapter instead of the built-in Wi-Fi. The Xbox 360 S console has built in Wi-Fi. If you have a wireless network, you don't need anything else.