Is the new blue USB 3 port backward compatible to USB 2.x?
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From: Man-wai Chang to The Door (33600bps) on 7 May 2010 09:02 -- @~@ Might, Courage, Vision, SINCERITY. / v \ Simplicity is Beauty! May the Force and Farce be with you! /( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.33.3 ^ ^ 21:01:01 up 2 days 4:43 2 users load average: 1.09 1.06 1.04 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA): http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
From: Paul on 7 May 2010 09:56 Man-wai Chang to The Door (33600bps) wrote: > Is the new blue USB 3 port backward compatible to USB 2.x? Yes. It is backward compatible, in part because there are two separate sets of contacts. The ones in white letters here, are the traditional signals, running USB 1.1 or USB 2.0. The signal names in red letters, are USB 3. If you plug in a connector with only the USB2 signals on it, the interface runs USB2. http://usb3.com/images/usb3_dia.jpg Paul
From: Man-wai Chang to The Door (33600bps) on 7 May 2010 23:47 On 5/7/2010 21:56, Paul wrote: > Man-wai Chang to The Door (33600bps) wrote: > >> Is the new blue USB 3 port backward compatible to USB 2.x? > > Yes. > > It is backward compatible, in part because there are two separate > sets of contacts. The ones in white letters here, are the > traditional signals, running USB 1.1 or USB 2.0. The signal > names in red letters, are USB 3. If you plug in a connector > with only the USB2 signals on it, the interface runs USB2. I suspect that this design is too demanding on the plug. The plug must be of the right length to make proper contacts. -- @~@ Might, Courage, Vision, SINCERITY. / v \ Simplicity is Beauty! May the Force and Farce be with you! /( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.33.3 ^ ^ 11:45:01 up 2 days 19:27 2 users load average: 1.22 1.11 1.06 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA): http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
From: david on 8 May 2010 09:13 On Sat, 08 May 2010 11:47:17 +0800, Man-wai Chang to The Door (33600bps) rearranged some electrons to say: > On 5/7/2010 21:56, Paul wrote: >> Man-wai Chang to The Door (33600bps) wrote: >> >>> Is the new blue USB 3 port backward compatible to USB 2.x? >> >> Yes. >> >> It is backward compatible, in part because there are two separate sets >> of contacts. The ones in white letters here, are the traditional >> signals, running USB 1.1 or USB 2.0. The signal names in red letters, >> are USB 3. If you plug in a connector with only the USB2 signals on it, >> the interface runs USB2. > > I suspect that this design is too demanding on the plug. The plug must > be of the right length to make proper contacts. Why would you think making this would be too "demanding"? No more demanding that making, say, a micro USB connector?
From: Paul on 8 May 2010 13:41
Man-wai Chang to The Door (33600bps) wrote: > On 5/7/2010 21:56, Paul wrote: >> Man-wai Chang to The Door (33600bps) wrote: >> >>> Is the new blue USB 3 port backward compatible to USB 2.x? >> >> Yes. >> >> It is backward compatible, in part because there are two separate >> sets of contacts. The ones in white letters here, are the >> traditional signals, running USB 1.1 or USB 2.0. The signal >> names in red letters, are USB 3. If you plug in a connector >> with only the USB2 signals on it, the interface runs USB2. > > I suspect that this design is too demanding on the plug. The plug must > be of the right length to make proper contacts. > Remember, they're engineers. They get paid to come up with solutions like this. And the USB standards organization would receive feedback from manufacturers, as to how feasible the thing is, in terms of building connectors and cables. In terms of the USB3 launch, the cables and connectors were the first components to be available. I thought it was a joke at the time, that you could buy a USB3 cable, when there was no hardware to use it. It doesn't look that hard to build cables. It is harder to build working silicon (5 gigabits/sec). Paul |