From: Michael M. Butler <mmbutler@gm...> - 2006-01-30 22:45:50
On 1/30/06, Keith Olson <ksoftconsulting@...> wrote:
> I just came across this:
Well, it's your money. ;)
I'm skeptical of their implicit claim that you can get 80 feet USB
2.0-compliant range by chaining 4 such devices.
You might be able to get *some* sort of USB through that. But I'd bet
a box of donuts you won't get anything like USB 2.0's 480 Mb/s. There
are fairly sound transmission-line physics reasons to stick to the
5-meter limit on cables. Just plugging into a hub might give 10 meters
(10 in, hub, 10 out),
And hubs are dirt cheap. But I don't know about using hubs with
Gumstix USB networking; it might not fly.
The canonical way to connect two "real" USB ports on two "real"
computers a long distance apart is to rig up a real long distance
network, using (e.g.) USB-Ethernet or USB-RS485 adaptors on each end.
That won't fly for the current gen of Gumstix because they are
peripheral hardware devices, not hosts. "Real" USB host HW needs to be
able to source mucho power, and that probably was a contributing
factor to Gumstix not having same.
USB On-The-Go might be worth looking at, once the spec settles. I hope
a future Gumstix product has something like that available.
Michael M. Butler : m m b u t l e r ( a t ) g m a i l . c o m
Churchill once said, "When you're going through hell, KEEP GOING".