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More like a LAN connection more then anything else
So LAN is normally IP, not necessarily TCP/IP and you do not need an ISP as all that is is a gate way to route TCP/IP over the internet. For example if you set up your network with a gate way using 192.168.0.1, you can set up all your systems for 192.168.02 - 192.168.0.255 and none of them will route to through the ISP because that is a private network. I don't know what X-band uses but maybe it supports IP so that you do not have to encapsulate it in TCP. Anyways, if you have a LAN using a 192 network, you can remove your modem and it will still work, hence its not using your ISP. You will need some type of gateway, be it a computer or router if you want to use TCP/IP. Find out first if you must use TCP/IP. And if so, set up a privet network.