On Mon, Jul 14, 2008 at 3:56 PM, Alan B. Pearce <A.B.Pearce@rl.ac.uk> wrote:
>>The Ethernet physical layer has some conditions for a minimal cable
>>length, so it's conceivable that USB might have a similar limitation
>>(though it doesn't).
>
> AIUI Ethernet also has conditions about message collisions which require a
> minimum cable length to work properly. The same collision conditions are
> involved in the maximum length.

I tried Google and it seems that the standard does not say this. But there
are non-IEEE source mentioning the limit.

http://www.duxcw.com/faq/network/cablng.htm
http://www.ctrlink.com/2006/07/no-minimum-length-for-cat-5.html


Xiaofan
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