Is there a maximum recommended distance for USB???

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Dawg

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#61168 11-May-2010 11:19

Hi All,

Been playing around with Web cam security And I just wondered if there was a maximum length cable recomendation for USB?

Cheers Shane

xpd

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#328837 11-May-2010 11:24

Wikipedia is your friend

"The maximum length of a standard USB cable (for USB 2.0 or earlier) is 5.0 metres (16.4 ft). The primary reason for this limit is the maximum allowed round-trip delay of about 1,500 ns. If USB host commands are unanswered by the USB device within the allowed time, the host considers the command lost."

http://en.wikipedia.org/wiki/Usb#Cables

:)

You can get active cables however which allow you to extend the run of cable.....

XPD / Gavin

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CYaBro

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#328839 11-May-2010 11:29

You can also get USB-CAT5/6 baluns/adapters that can extend USB up to about 40M.
I think they only do USB1.1 at the moment though.

Opinions are my own and not the views of my employer.

Dawg

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#328845 11-May-2010 11:35

Thanks guys

pageweon

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#328884 11-May-2010 12:38

Dicksmith used to sell a usb "amplifier" for longer cables.. that was some time ago though

this is where a signature goes

xpd

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#328885 11-May-2010 12:39

Cant remember where I found this but might be of interest

http://www.eltima.com/products/usb-over-ethernet/

XPD / Gavin

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gabba

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#329096 11-May-2010 19:57

I have a webcam working happily off two of these strung together...

http://www.dse.co.nz/dse.shop/4be90e36007fc308273fc0a87f3b068b/Product/View/XH8199

...so I guess that's about 12m. I have heard of people (and have had limited success myself) with three of them in series and that would give you about 17m

Cheers