USB 2 Maximum Cable Length - Webmaster Forum - Web Design, Programming and SEO forums

11-02-2007, 01:34 PM

Gleb

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USB 2 Maximum Cable Length

My backup device is a USB 2.0 250 MB Iomega Hard Drive.I'd like to put
it in my garage, requiring about 20 to 25 feet of wire. The official
USB specs say 5 meters max; if further use a hub/repeater.

I'm wondering how realistic the 5 meter spec is. I recall that parallel
printer cables were supposed to be limited to 10 feet or so; 75 foot
cables worked just fine. Same thing with the specs for RS-232 cables.

Does anyone have any real world experience with long USB 2.0 cables?
I'm thinking of building mine using unshielded CAT5 cable, one twisted
pair for power, another for data. Wise? foolish?

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11-02-2007, 09:45 PM

Matsta

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The maximum for high powered devices (Ones that rely on USB for power) is 5 meters. If your Hard Drive uses its own power supply you can have up to 25 meters of cable.