17 of 19 people found the following review helpful
10 port hub - lacks real power,
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This review is from: LUPO 10 Ports High Performance USB 2.0 HUB, Plug and Play (Black)
The item arrived on time and was well packaged. It is well made and connects easily to a PC. I'm using it with Windows XP which had no problems recognising it. BUT, this unit is not powered and so can only support a connection with powered equipment such as printers, scanners, etc.. It cannot be connected to unpowered equipment such as some keyboards, optical mouse, etc.. There does appear to be an input on the side for a power cable but no such cable is supplied, nor is there any instructions. I did try (probably stupidly)to plug in a spare power cable (from another hub which I have) with very odd results! I would not recommend anyone attempts this. Having said that, it did resolve my connectivity problem and the product fitted my purpose.
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Showing 1-3 of 3 posts in this discussion
Initial post: 15 Jun 2012 13:33:27 BDT
John Reed says:
I need a powered hub so this was a very useful review - thanks
Posted on 15 Jul 2012 11:28:37 BDT
You obviously haven't got a clue about usb hubs. It will power up at least one, possibly two unpowered devices as standard usb already has 5w power.
Posted on 18 Sep 2012 19:49:14 BDT
Alan Smithee says:
It's quite funny when one person tells another person off for not understanding something or other. Then they admonish their victim and totally screw up the explanation by getting it wrong themselves. In this case Rayghor states that a standard USB already has 5w power meaning 5 Watts of power. He of course means a standard USB port has 5v (5 volts) at its output. A volt is of course not a measurement of power at all , but a measurement of potential difference.
The correct info is that a standard unpowered USB port can only safely supply 100ma of current.
A watt BTW is calculated as Current times Volts which means power.
To power higher power devices: (i.e. USB 2 devices)
You should use a powered USB hub, that can supply >= 0.5A per USB port. This means if your USB hub has 4 ports, it should use at least a 2A power supply.
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