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usb ports


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#1 bassfisher6522

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Posted 18 February 2014 - 09:39 AM

How does on tell if a usb port on the mobo and on the front panel of the case is high powered or low powered? I



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#2 rotor123

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Posted 18 February 2014 - 09:46 AM

I'm not sure how You mean that.

If by Power you the current capacity? a USB 2 port should be able to supply 1/2 Amp AKA 500Milliamps

On a Computer they should all meet that specification. However a unpowered hub is a different matter. Some USB devices have two USB connectors. 1 for signaling and one to get power. I have a scanner like that. I can use it with a AC Adapter or I can use a USB to power jack that came with it and power it that way. It does scan slower that way of course.

 

If by Speed You mean the USB ports, then USB3 ports usually have Blue showing when You look in.

 

Roger


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#3 zingo156

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Posted 18 February 2014 - 10:19 AM

USB 2.0 standard allows up to 0.5 - 2 Amps on some powered hubs. (This was changed with modern smart phones and the added draw).
USB 3.0 standard allows up to 5 Amps. These ports are significantly faster with a compatible 3.0 device. (on most computers these 3.0 ports are blue).

 

USB 3.0 can deliever quite a bit more power. I have actually seen a usb mouse adapter melted when it shorted in a 3.0 port. The usb device fused into the laptop port and the entire port needed to be de soldered to remove the bad usb device. Unfortunately even after removing the shorted port the laptop main board was dead.

 

As far as I know there is no way to know for certain the output, I would consult the main board manual.

 

EDIT I think usb 2.0 mainboards only supply 0.5 amps.


Edited by zingo156, 18 February 2014 - 02:30 PM.

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#4 rotor123

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Posted 18 February 2014 - 01:27 PM

Ah ha, Smart phones. I guess I'm old school. I did not realize they had changed it.

 

I guess Wikipedia has it wrong. http://en.wikipedia.org/wiki/USB#Power shows

 

A unit load is defined as 100 mA in USB 2.0, and 150 mA in USB 3.0. A device may draw a maximum of 5 unit loads (500 mA) from a port in USB 2.0; 6 (900 mA) in USB 3.0

Which is what I remembered.

 

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#5 zingo156

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Posted 18 February 2014 - 01:47 PM

The difference there is with or without data device: (found here: http://en.wikipedia.org/wiki/USB#Power)

Signal 5 volt DC Max. voltage 5.00±0.25 V (pre-3.0); 5.00+0.25-0.55 V (USB 3.0) Max. current

0.5–0.9 A (general);
5 A (charging devices)

 

Again it likely depends on the main board itself and the design. I have no idea if there is a solid standard or not between vendors.

 

I usually do not make use of high amperage devices on any laptop or main board. I instead use a powered usb hub.


Edited by zingo156, 18 February 2014 - 02:16 PM.

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