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On 19/12/2012 19:10, Cowboy wrote:
> Some USB devices will draw more from the supply than the computer 
> is designed for, over time. This can cause the USB hub to shut
> down. If that happens, I've found no way other than a complete cold
> boot to reset the USB subsystem.
> 
> Whatever you choose, you might wish to consider an external hub
> just for the power supply.
> 

For reference the UCA202 draws up to 200mA so on modern PCs, it should
not be an issue. It tends not to be an issue except on low-end or
embedded systems. Powered hubs have their own gotchas, naturally - a
better approach if you have spare PCI/PCIe slots is to add USB
PCI/PCIe cards, which will draw power directly from the PSU on the PC.
I've yet to have to do this for anything, though.

fwiw, I've had good experiences with the UCA202 for the low-end side
of things, and would recommend them (possibly the only Behringer
product I'd ever recommend to anyone). They're dead simple bits of
kit, just an USB audio codec chip and the appropriate support circuitry.

And yes, Rivendell will play fine with multiple cards - they show up
as different cards in ALSA. You do have to be a bit wary of power-on
ordering/having the same card mapped to the same ALSA device number
each time but I think it's pretty solid these days if you're not
constantly replugging, and even then you can do some udev hackery.


Cheers,
James Harrison
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