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strange cable - what could it be for?


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#1
digikiwi

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Hi

this is just some cat killing curiousity here. I picked up an ex showroom I-rocks card reader/usb hub and in the box (not original packaging) there was a USB cable that terminates in a power adapter plug - like the kind that you would plug into your phone to charge it. Could this be to supply power to a low power device?

Or is it supposed to draw extra power from the mobo usb hub to the I-rocks device if I don't use its mains power adapter?



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Edited by digikiwi, 08 December 2006 - 07:55 PM.

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#2
SRX660

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That is exactly it's purpose. To provide extra low power, around 2.5 watts, for a device that uses more than a single USB port can supply. I am seeing more and more of these type of connectors.

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#3
digikiwi

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That is exactly it's purpose. To provide extra low power, around 2.5 watts, for a device


So is that

1) for some other device that connects from the hub/reader ?
2) or can it provide power from the mobo hub to the reader if the AC to DC adapter isnt used?
3) or both?

If 1=true then what type of device? Or better said, I assume some devices could be damaged if the 5V 2.5W supply is inappropriate. Maybe you could name a couple of examples.

Thanks SRX660

Digikiwi

Edited by digikiwi, 09 December 2006 - 04:14 PM.

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#4
SRX660

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As a for instance, say you are using a laptop and are away on business and need to pull pictures off a camera card to put in the laptop. What this device will do is let add a little extra power to the card reader/hub so that it has enough power to complete what you want done. Many times you will see laptop external drive kits that have a USB connector with 2 connectors on one end. This is to supply 4 to 5 amps to run the laptop drive because 2.5 amps is not enough.

Heres some example addonics USB cables.

http://www.addonics....power_cable.asp

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#5
digikiwi

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Excellent explanation and link. Thanks very much SRX660.
:whistling:

BTW did you mean 2.5 Watt or Amp in the previous post (just to clarify for other readers).

Digikiwi

Edited by digikiwi, 09 December 2006 - 05:43 PM.

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#6
SRX660

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Unfortunately, the USB 1.1 and USB 2.0 protocols limit bus supplied power to 2.5 Watts (0.5A @ +5V) per port.

Slip of the tongue! EH!

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#7
digikiwi

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That's what I thought you meant.

Whether it was a slip of the tongue or the keyboard remains a moot point :whistling: ...

Thanks again for the education

:blink:

Digikiwi
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