On 30 Oct 2006, at 20:59, Roger Millin wrote: > Could one of you techy types assist again please? My 4 way USB, self > powered hub (USB 1.1) gave up the ghost today. I'm using a Toshiba > Satellite Pro 6100 (approaching 4 years old now) running XP Pro and > can't seem to identify what USB version it runs except to know that > I've seen occasional 'warning' messages suggesting that I could > inprove the performance of such and such a device by running USB > 2.0........so I'm pretty certain the Tosh can't be supporting that > level. I've located another USB hub (good old Screwfix where I bought > the first) and there are two on offer. One is a cheapo and doesn't > seem to indicate what standard it is. The other isn't that much more > expensive and clearly states that it is USB 2.0 but supports > 1.5/12/480 Mbps data transfer rates. My question is, if I buy and fit > this USB 2.0 hub to my existing computer set up, will it work. I'm > aware that USB 2.0 is backward compatible for the slave devices, but > is it going to be OK if the laptop feeding it is not USB 2.0? > Ta muchly,
USB devices are designed to fall-back to 'full speed' (12 Mbit/s) if 'hi-speed' (480 Mbit/s) is not available. This should apply to a hub's upstream connection too, so I think it will work, but you won't get the benefit of 'hi-speed' connections to USB 2.0 devices. The hub will throttle their bandwidth down to 12 Mbit/s for the connection to the host (i.e. your laptop) assuming it is 'full speed' only. If that's the case the only reason to get a 'hi-speed' hub now is in anticipation of a host "upgrade" :-) Note that USB 2.0 doesn't necessarily imply 'hi-speed' - a 'full- speed' (or even 'low-speed' - 1.5 Mbit/s) device can be USB 2.0 compatible, but only USB 2.0 compatible devices can support 'hi- speed'. -- Andy Greener n.b. Whisper Pangbourne, UK http://www.nb-whisper.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/canals-list/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/canals-list/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
