How to Connect Two Laptops with One AirCard
An AirCard is a cellular modem made by Sierra Wireless that connects to a USB port or PC card slot on your laptop. It uses a dial-up networking connection to connect to the Internet, so connecting your AirCard to a wireless router will not work. Carriers offer portable wireless hotspots for connecting multiple devices, but they require an extra line. The Windows 7 operating system allows you to share a connection between two computers using a special cable.
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Instructions
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Connect the laptop with the AirCard to the Internet using the carrier's connection software.
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Plug the crossover cable into the Ethernet port on both laptops.
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Click the "Start" button on the Windows task bar on the laptop with the AirCard. Choose Control Panel and select Network and Internet.
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Open the Network and Sharing Center and click Change Adapter Settings in the left pane.
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Right-click the dial-up networking connection for your AirCard and select Properties.
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Click the Sharing tab and check the box labeled "Allow other network users to connect through this computer's Internet connection."
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Select your Ethernet connection in the drop-down box and click "OK."
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Tips & Warnings
You cannot use a standard Ethernet cable to connect the two laptops. With a standard Ethernet cable, the transmission pins on one connector are wired to the transmission pins on the other connector. With a crossover cable, the transmission pins on one connector are connected to the receiver pins on the other. If you have only standard Ethernet cables, you must use an Ethernet switch between the two cables.
