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Unless you have a device with a seperate power source (such as an AC adapter), you should consult the FAQ section on Network Interface Cards.
If you have a device with a wall-powered source (e.g. an AC adapter that plugs into an electrical socket), your device probably has more in common with a Router. Consult the section on Routers/Gateway devices.
If your device is also wireless, you should also see the section on Wireless Routers.