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USB hubs and devices can cause installation issues
Authored by: magir on Apr 08, '03 03:46:22AM

I've got an IIyama-TFT-Display with an internal passive usb hub (not powered) when I plug in more than two devices it starts acting strangely. I use a USB-Switchbox zu switch between two machines and this works flawlessly with two devices (keyboard and mouse) but when I add a usb2serial-adapter or a printer they keyboard and or mouse sometimes stop working and even kernel crashes occur. Under OS9 I got warnings when a device uses to much power but as it seems this isn't implemented in OSX (yet). I guess this is related to that issue.



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Macally USB-UH Hub lost me $200
Authored by: ryuukosan on Feb 01, '04 10:59:45PM

Without any exaggeration or frustration, here are the facts:


I bought a Macally USB-UH 2.0 firewire hub and the firewire ports didn't work. I returned it through snail mail from the company and got a new one (that came in a box with no packaging). When I hooked it up to my Powerbook G4 (with 3 USB devices in the new hub), neither the firewire ports nor the USB ports on the hub worked. I unhooked it and replugged the three other usb devices into my other hub (belkin 4port which works beautifully) and I had found that all the devices I hooked into the second non-working hub didn't work in any port. Now my keyboard, mouse, and wacom tablet don't respond to any port. Can anyone tell me what happened?

My answers so far are:

The hub shot a circuit in all three devices (how does this happen?)
The hub reversed the polarity in the devices' cables (how?)
The hub blew fuses in all three devices (again, how?)


Any answer would help me solve this mystery (even though $200 worth of peripherals seems forever gone due to a macally hub).



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