The GPS and the modem are conflicting

April 29, 2011 at 11:47:25
Specs: Windows XP, Intel Core 2
My USB GPS receiver knocks out my USB modem when both are plugged in.

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April 29, 2011 at 13:10:59
Use a different USB port for one or the other. If both ports are side by side they most likely are both fed by the same USB controller because USB controllers usually support TWO USB ports and sometimes a card reader in addition.

And don't use a USB hub to get multiple connections from one USB port.

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April 29, 2011 at 16:51:36
Hi OtheHill
Thank you so much for involving yourself. The wisdom of your advises were not lost on me. These however are more sinister b---tards.
Yes I use a hub, - that is an extension cable at the same time. The earlier version of both the GPS antenna and the 3G modem were happily coexisting on it.
What I will try based on your inspiration is this: I have been plugging the modem around everywhere but I do not remember replugging the GPS. When that mapping software is searching for its signal, it always happily announces that let's say signal on port 49.... But, by the same token the other wires of the hub or the other side of the computer have these entry points numbered too, but there must be some bunching somewhere because there are no 49 holes on the computer...So my thinking is loosing it somewhere there. This IRQ stuff does not apply here?
Hope you are hungry to think on anything thrown at you...

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April 29, 2011 at 17:11:29
Hubs are fine for low power devices like Mice & keyboards.

I would just state that there is a reason why makers keep throwing more and more USB ports on their motherboards. Hubs don't work very well unless they are powered ones. Hubs can also step the USB through put to 1.1 speeds. Your best ports to use are those directly attached to the motherboard.

The port 49 you refer to has nothing to do with the USB but rather your network/internet. See the link below.

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