Issues Managing a large number of USB devices

January 10, 2011 at 19:35:43
Specs: Windows XP
Hi
My problem is managing a large number of USB devices.
I thought that the limit of USB ports that can be handled by a PC with XP home edition is 128. When I connected multiple controllers (each with a USB port), Windows XP recognized only 37 ports although I had 64 USB ports connected. Each time it recognized a different set of 37 USB ports.. When I tried the same on a PC with WINDOWS XP Pro, one PC recognized 46 USB ports and another saw 50.. I am unsure what causes this. Can this be a result of the motherboard used (say ATOM versus Intel?) or the OS used? Can I preset in the OS or BIOS some parameters to ensure that 64 or 128 ports can be recognized?
Thanks for your thoughts!

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#1
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#2
January 11, 2011 at 03:38:21
Although 128 is the theoretical maximum number of ports on a single hub, you are likely to run into restrictions long before you reach that number.

Each port will require it's own address space and interrupts. If you run out of space then you have reached your limit. Interrupts can be shared,there is a limit as to how many devices and interrupt can share.

Stuart


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#3
March 16, 2011 at 08:36:48
Then could you tell me how I can determine the maximum number of USB devices which could be reliably managed on a particular PC?

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#4
March 16, 2011 at 11:07:33
Just keep plugging them in till something stops working. It is going to be different for every computer depending on the hardware and how it is configured.

Stuart


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