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Reducing USB bandwidth allocated by USB Composite device

Last response: in Windows XP
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August 10, 2004 2:55:31 AM

Archived from groups: microsoft.public.windowsxp.hardware (More info?)

Hello,

We are using six USB audio compsite devices each based on
TI PCM2904 stereo USB audio CODEC. Operating systems is
windows2000/XP and computer has USB1.1 controller. The
problem is that each device requests 15% of USB bandwidth
(device really uses 25% of requested bandwidth). Assuming
that system uses about 20% there are only 5 composite
devices enabled - last device doesnt work... :( 

The question is: Is there any way to reduce USB composite
device requsted bandwidth?

Thank you in advance,
Sergey
August 27, 2004 11:04:33 PM

Archived from groups: microsoft.public.windowsxp.hardware (More info?)

Use a powered hub to run your devices

"Sergey" <anonymous@discussions.microsoft.com> wrote in message
news:333001c47e9e$a548a2f0$a401280a@phx.gbl...
> Hello,
>
> We are using six USB audio compsite devices each based on
> TI PCM2904 stereo USB audio CODEC. Operating systems is
> windows2000/XP and computer has USB1.1 controller. The
> problem is that each device requests 15% of USB bandwidth
> (device really uses 25% of requested bandwidth). Assuming
> that system uses about 20% there are only 5 composite
> devices enabled - last device doesnt work... :( 
>
> The question is: Is there any way to reduce USB composite
> device requsted bandwidth?
>
> Thank you in advance,
> Sergey
Anonymous
August 28, 2004 1:17:50 AM

Archived from groups: microsoft.public.windowsxp.hardware (More info?)

> "Sergey" <anonymous@discussions.microsoft.com> wrote in message
> news:333001c47e9e$a548a2f0$a401280a@phx.gbl...
> > Hello,
> >
> > We are using six USB audio compsite devices each based on
> > TI PCM2904 stereo USB audio CODEC. Operating systems is
> > windows2000/XP and computer has USB1.1 controller. The
> > problem is that each device requests 15% of USB bandwidth
> > (device really uses 25% of requested bandwidth). Assuming
> > that system uses about 20% there are only 5 composite
> > devices enabled - last device doesnt work... :( 
> >
> > The question is: Is there any way to reduce USB composite
> > device requsted bandwidth?
> >
> > Thank you in advance,
> > Sergey
>
>

This option, if it exists, will be in the device driver
dialog for the device itself. I have an ATI USB
capture box that has it.

If it doesn't exist, or you can't find it,
contact the manufacturer of the device.
!