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Pocket Wireless Access Point

Id like to create a portable access point about the size of a usb thumb drive. The goal is to create a device that plugs directly into an Ethernet port and use that connection to become a wireless access point. It should be powered by the ethernet port.

So my question is has this how do I get started creating something like this? I'm thinking of using a small linux client paired with a wifi receiver.Where can i find these things?
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Sorry, yea i meant straight into a network switch or port
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How about an embedded controller? I have know idea what exists past desktop platforms.
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My goal is to have something i can plug into a network port and create an access point without using a power supply
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whats the smallest a power supply? Don't they usually require a hefty transformer?
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Ok cool, i can settle for a battery powered system. How do I get started on the host controller?
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The wifi chips inside smartphone can function as access points. I use my HTC Touch pro connected to 3G and a wifi router for my laptop.
Thanks for the correction chuckyh. How much range do you get with your smartphone acting as a wifi hostspot?
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Orion88

You would have to power with PowerOverEthernet or use the ac adapter, but an ethernet wireless gaming adapter that they sell for xbox etc does this for you already.