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'[OT]: max length on usb?'
2001\01\17@085320 by Bob Ammerman

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Low speed: 3 meters

Full speed: 5 meters

Note: that is _not_ a typo. Full speed can go _further_ than low-speed!

But, you can increase this by including intermediate hubs.

You can have up to 5 hubs between a device and the computer.

Thus max distance is 6 * 5 = 30 meters.

Don't try to stretch this numbers, it isn't likely to work very well.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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2001\01\17@090525 by severson

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> Don't try to stretch this numbers, it isn't likely to work very well.

From personal experience: Just as a test, I ran several lengths of "illegal"
extension cables to a USB device. Although I managed to get the command that
I sent to the device through this length, I was doing this only as a stress
test. The message rate was very low, certainly not video. I am certain that
operating beyond the length limit will cause nothing but difficulties for a
device like a web cam.

There are "USB lengthening" devices available that use an intermediary
media.


-Robert Severson
http://usbsimm.home.att.net
http://www.jged.com
http://www.annatechnology.com


{Quote hidden}

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2001\01\17@130339 by rich+piclist

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> Note: that is _not_ a typo. Full speed can go _further_ than low-speed!
Why?

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2001\01\17@132045 by John Pfaff

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See http://www.usb.org/developers/usbfaq.html#cab1

John

----- Original Message -----
From: <rich+spam_OUTpiclistTakeThisOuTspamLCLOGIC.COM>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Sent: Wednesday, January 17, 2001 1:03 PM
Subject: Re: [OT]: max length on usb?


> > Note: that is _not_ a typo. Full speed can go _further_ than low-speed!
> Why?
>
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>

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2001\01\17@133535 by Bob Ammerman

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----- Original Message -----
From: <rich+piclistspamKILLspamLCLOGIC.COM>
To: <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Sent: Wednesday, January 17, 2001 1:03 PM
Subject: Re: [OT]: max length on usb?


> > Note: that is _not_ a typo. Full speed can go _further_ than low-speed!
> Why?

Low speed and full speed operation use two differrent signaling techniques.

The idea was to make it really cheap to do low speed USB (keyboards, mice,
etc.) , so the signaling is much simpler than full speed.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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