High Speed/Low Speed USB

  • Thread starter Thread starter ricky.lorenzana
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ricky.lorenzana

If Someone knows how to distinguish between a USB HIGH SPEED and USB
LOW SPEED please help me.
Thanks in advance!!!!
 
If Someone knows how to distinguish between a USB HIGH SPEED and USB
LOW SPEED please help me.
Click to expand...

The easiest way by far is to obtain a special cable made by Belkin that has
an LED half way along it. It glows red for slow and fast USB communication,
and green for high speed communication.

If you cannot locate such a cable, then connect your peripheral to the root
port of a PC (not a hub), and open the root hubs in device manager. If you
look at the 'Properties' page, you will see a 'power' tab. The tab will
show which root hub your peripheral is connected to. If it is connected to
the 'enhanced' root hub (the power tab will show 6 or 8 available ports)
then it is communicating in high speed mode. If it is connected to a normal
root hub (the power tab will show only 2 available ports), then it is
communication in fast or slow mode. If it isn't clear what the peripheral
is from the often vague description then unplugging it and reconnecting it
should show where it being connected to.

Alternatively you can download the Microsoft USB tree viewer from here

http://www.ftdichip.com/Resources/Utilities.htm

which should show you all the USB connections in one go.
 
M.I.5¾ said:
Wikipedia is not an acceptable authority on anything. And that article is
full of errors and omissions.
Click to expand...
USB 1.0 is low-speed, maximum 1.5 Mbps
USB 1.1 is full-speed, maximum 12 Mbps,
USB 2.0 is high-speed, maximum 480 Mbps.

In case that is what the OP really wanted to know.

Jim.
 
Jim Cladingboel said:
USB 1.0 is low-speed, maximum 1.5 Mbps
USB 1.1 is full-speed, maximum 12 Mbps,
USB 2.0 is high-speed, maximum 480 Mbps.

In case that is what the OP really wanted to know.
Click to expand...

I hope he didn't because that's utter rubbish.

FYI.

USB 1.0 was a specification that covered low (1.5 Mbps) *and* fast (12
Mbps).

Unfortunately something wasn't specified closely enough and some peripherals
didn't work.

USB 1.1 was a revision that sorted the anomoly and the difference only
affects peripherals.

USB 2.0 covers high speed (480 Mbps) *and* fast speed *and* low speed, not
necessarily inclusively. Thus a PC that has a USB system supporting fast
and slow speeds but no high speed can legitimately claim to have USB 2.0
ports. To put it another way, a PC that meets USB 1.0 also meets USB 2.0.

and to complete the story

USB 3.0 includes two new speeds of which the higher is ~4.8 Gbps. It is
currently not a released spec and it remains to be seen whether the new
speeds are compulsory on items that claim to be USB3 compliant.
 
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