Kiss my gritts! Each day I learn something from this group. I have
three Belkin's two sitting on top of the other that are seven port
each, the other is by itself and is a four port. If I plug in the
iPhone to it's dock, the iTouch, & the iPod classic along with all
the other devices that are connected I then get a warning that there
isn't enough power so all my kicking the desk only makes my toe
sore. I had no idea there was a limit to these things. Thanks Lee,
really good to know.
John
On Jul 30, 2008, at 3:02 PM, Lee Larson wrote:
On Jul 30, at 5:21 AM, Stuart Ungar wrote:
I've been having issues with a USB 2.0 powered hub. Some things
plugged into it seem to work on and off. Is there a reason for
this? Items plugged directly into the back of my mini work fine,
but i only have 2 USB ports back there. Could the hub be bad? It
is driving me a bit crazy.
I had a Belkin 4-port hub that was similarly driving me crazy
because a cheaper 4-port Ananté worked fine with the same devices. I
finally figured out why. The Belkin had a wall wart that gave 750 mA
output and the Asanté's was rated at 1.2 A (1200 mA). The USB
specification says that a single device can draw up to 500 mA
through the USB port. With some combinations of four devices plugged
in, the power draw sometimes exceeded 750 mA but not 1200 mA.
Notice that neither device could handle a 500 mA device in all four
ports.
I've got a Dell 7-port USB hub in my office that came with a 1A
power supply. I've never tried it with more than three devices.
_______________________________________________
The next Louisville Computer Society meeting will
be September 23 at MacAuthority, 128 Breckinridge Lane.
Posting address: [email protected]
Information: http://www.math.louisville.edu/mailman/listinfo/macgroup
_______________________________________________
The next Louisville Computer Society meeting will
be September 23 at MacAuthority, 128 Breckinridge Lane.
Posting address: [email protected]
Information: http://www.math.louisville.edu/mailman/listinfo/macgroup
