I just wanted to clarify a few points about limitations
of the USB bus.
The stated maximum number of USB devices per controller
is 127, where hubs also count as one device. The Dell PC I
have has one controller with a "root hub", so it would seem
that that the two USB ports on the back of the machine are
actually on the same controller and consequently I will have
a maximum of 126 devices. If this is correct, then my
question is is the root hub a requirement of the USB
controller design? Will there always be a "root hub" that
takes up one device?
Also, the 127 device limit is per controller right? If
I add another controller, then I can have another 127 devices
on that bus? And finally, the USB serial device limit is 256
which I could theoretically attain with at least 3
independent USB controllers?
Thanks,
-poul
-------------------------------------------------------
This SF.net email is sponsored by: Get the new Palm Tungsten T
handheld. Power & Color in a compact size!
http://ads.sourceforge.net/cgi-bin/redirect.pl?palm0002en
_______________________________________________
[EMAIL PROTECTED]
To unsubscribe, use the last form field at:
https://lists.sourceforge.net/lists/listinfo/linux-usb-users
