XJACK

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In laptop computing, the XJACK is a type of extendable connector or antenna for a type II PC card, designed by the Megahertz subsidiary of 3Com. When not in use, the XJACK retracts into the PC card for storage.

The XJACK was originally used in modem and network cards, to attach a standard RJ11 or RJ45 plug directly to the PC card. They do not require a separate dongle, which could be lost or misplaced, and do not need to be removed from the laptop when travelling. An alternative approach is to use larger type III cards with a regular RJ-type socket, but this approach requires more space.cite web |url=http://www.3com.com/other/pdfs/products/en_US/40036007.pdf |publisher=3Com |title=3Com LAN+Modem Cardbus Cards |accessdate=2008-08-01 |date=2002-08]

Wi-fi PC cards for accessing wireless networks have an external portion containing the antenna for improved reception (as compared with inside the laptop), but this portion of the card may be accidentally damaged while moving the laptop. 3Com manufactured wireless cards with retractable antenna portions, also under the XJACK name.cite web |url=http://www.3com.com/other/pdfs/products/en_US/3Com-400914.pdf |title=3Com Wireless 11a/b/g PC Card with XJACK Antenna |publisher=3Com |date=2006-01 |accessdate=2008-08-01] Other companies have since manufactured wireless cards with retractable antennas. [cite web |url=http://www.akihabaranews.com/en/news-11071-AX420S,+the+PHS+204kbps+CF.html |title=AX420S network card |accessdate=2008-08-01]

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