On 13 March 2012 17:27, N.A. Nada <whodo678@comcast.net> wrote:
>
> Thanks for explaining the mechanics, or I guess the electronics of it.
>
> While you are there, I was wondering if you could give an opinion on
> another USB power question.
>
> I am trying to space a USB three way away from MacBook Pro. When plugged
> in directly, I can power my Canon LiDE30 scanner. I have mixed results
> trying my three 30-inch male/female USB cables.
>
> The Griffin is the smallest diameter, and functions the best, but it
> apparently providing just enough power. A generic cable is providing just
> under enough power, where it might work once of twice, but not enough for
> multiple scans. It is the common diameter. Both of these will light the LED
> on the Belkins 3-way.
>
> And then I have an Apple male/female USB cable, that came with my MBP. It
> can not even light the LED in the 3-way, but is the largest diameter,
> similar to a Firewire cable.
>
> My question is there no standard for power transmission over USB cables?
> I'm trying to move the cable clutter just a little further back from the
> MBP.
>
> I think the total distance from MBP to scanner is right about 6 feet. The
> scanner is the only one that is USB powered, other than LED.
>
I've not heard of the Apple male-female USB cable. What would it be used
with?
Is the "3-way" a passive hub? You do realise that if it's passive, the
available current has to be split 3 ways?
Otto
[Non-text portions of this message have been removed]
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