XJACK is a type of connector for notebook computer modems that allows a standard telephone connector to snap into the modem. Some internal modems for notebook computers come on a slim PCMCIA card. XJACK is a connector on the PCMCIA card that pulls out and allows you to snap a regular wall jack connector into the modem directly and this connection is secure. XJACK was originally manufactured by Megahertz, a subsidiary of U.S. Robotics. However, a number of other modem manufacturers now build the XJACK into their mobile-size modems.
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