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Author Topic: Computer in a keyboard....  (Read 6375 times)

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Offline asian1

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Re: Computer in a keyboard....
« on: January 16, 2006, 11:34:32 PM »
Perhaps they should use VIA EDEN / Geode etc and create Power Over Ethernet Plus Thin Client/Terminal (30 watts).

The diskless PC will be great in classroom, labs, centralized computing, call center/reservation etc.

http://www.elecdesign.com/Articles/ArticleID/9807/ehg.hitbox.com

"The two-pair option prevents the cost and current balance problems, requiring only minor modifications to the circuitry already in place in today's 802.3af designs. The cost for two-pair designs is the power lost when the cable gets long, because only half as many wires carry current compared to the four-pair case. This lost power heats the cable (especially when many cables are bundled together), and it adds to the stress on connector fingers and patch panel traces. Above 30 W, these factors can become significant. Higher current levels also aggravate ringing due to parasitic inductance during plug and unplug events, increasing the risk of damage to PD or PSE circuitry"