"Yousuf Khan" wrote in message
...
VanguardLH wrote:
Have you visited the manufacturer's web site to get the specs on
those USB hubs? Having the same hardware (i.e., chipset) says
nothing about how the manufacturer utilized that hardware. Lots of
analog modems use the same Conexant chip but the *cards* don't have
the same feature set. Same subsystem components do not enforce the
same system features. Could be one of the hubs really only is 1.1
compliant and that using it as a 2.0 device is not recommended. Of
course, the device could be just a crappy low-grade cheap unit that
doesn't properly respond to report itself correctly, or you need a
better USB cable.

Well, as I said previously, these are "generic" hubs, very generic.
I doubt any of us have heard of the manufacturers' names: there
isn't much point in checking their websites, they probably sell tons
of little products. One is from Vantec and the other is Acrox. The
Acrox is the older more reliable one. Both of them are advertised as
USB 2.0 hubs, and both of them are identified as "USB2.0 Hub"
internally, polled from the USB configuration itself.


Vantec is not a small company but that doesn't mean everything they
sell is something they themself produced but might instead have
slapped their label on it (http://www.vantecusa.com/). The current
USB hub selections are shown at
http://www.vantecusa.com/product-peripheral.html. They do seem
confused between what is self-powered and bus-powered hubs (what they
say for self-powered is actually for bus-powered).

Have you tried swapping to which USB ports these hubs are connected
(i.e., swap them between themselves) to see if the problem stays with
whatever hub in on a USB port or if the problem migrates with to
whichever port the hub gets moved? That is, does the problem move
with the hub or remain with the USB port?