Re: Old USB Query
From: Jim Macklin (p51mustang[threeX12)
Date: 04/12/04
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Date: Mon, 12 Apr 2004 07:18:51 -0500
USB can supply .5 amps to each device but the port is
limited in power output. That is why devices that require
full power also need a powered hub when you start to
daisy-chain.
"BAR" <anonymous@discussions.microsoft.com> wrote in message
news:8CC82F14-E112-4200-BEAA-3D66F15E9810@microsoft.com...
| If you review your USB Root Hub properties in Device
Manager you will find that it generally requires only 2
milli-amps.
|
| A few USB myths explained:
| Yes USB can support over 100 devices 'daisey-chained' but
I have yet to find ONE device that has the ability to plug
another into it: thus the fist link in the chain is the
LAST.
| The best example of chaining is the Microsoft USB Keyboard
that allows for 2 additional devices to be connected - very
useful to plug a mouse into and keep its cable close to the
desktop [finally catching up to Apple's idea].
|
|
| If you have a requirement for more than 2 USB devices [I
have more than 6] get a Powered USB HUB that sits on your
desktop.
|
| The use of a HUB is more practical for most people and
also facilitates the installation and removal of items such
as your Digital Camera, USB Memory Stick and such like. It
is also cheaper than a new Power Supply and easier by far to
install.
|
| Given that your hardware configuration includes a 300W
power supply: this should be more than adequate. Do of
course review the 5V power specifications [as used by the
PCI USB Cards], just to confirm that there is adequate
output at that voltage.
|
| I am confident that if your power supply was straining to
meet the power demands of your devices, then you would find
the system crashing as the memory and CPU would be running
out of power also. I don not read this in your post.
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