Re: [Thinkpad] Anybody know? Is R30 USB 1 or 1.1?

Thanks!

I had been thrown off by the Wikipedia entry that stated USB 1.0 was 1.5
Mbit/s vs. USB 1.1 at 12 Mbit -- and that's why I was trying to figure out
whether the X20/R30 supported 1.0 or 1.1 -- lesson learned! ;)

> Yes. From the linked article:
>
> *Did the specification for the host controller change from version 1.0
> to 1.1? *
>
> NO. The host controller portion of the USB specification is unchanged
> in the 1.1 revision. As part of a complete USB specification,
> specification 1.1 included the UNCHANGED 1.0 USB host controller
> specification. There is NO difference in the host controller
> specification in version 1.1.
>
> Which backs up my statement that the host in 1.0 & 1.1 are both capable
> of 12Mbit/s speeds, and it is the device that is the determining factor.
> I recall back in the day that some webcams were 1.0 and others 1.1, and
> only the 1.1 cams were able to do 320x240 at 30fps.
>
> -------- Original Message --------
> Subject: Re:[Thinkpad] Anybody know? Is R30 USB 1 or 1.1?
> From: "Scott Matthews" <scott@turnstyle.com>
> To: "Jonathan Kelly" <jcrkelly@gmail.com>
> Date: 11/3/2007 9:48 AM
> > I just found this:
> > http://www.usbman.com/Guides/USB_version1.0_version1.1.htm
> >
> > Would you similarly interpret this to mean that there is no difference
> > between USB 1 and 1.1 on the ThinkPad side?
> >
> > -Scott
> >
> >
> >
> >
> >> I'm pretty certain from personal past experience that any 1.0 interface
> >> is capable of 12Mbit/s. The question lies with the device being
> >> connected, as to whether it is a low of full speed device.
> >>
> >> -------- Original Message --------
> >> Subject: Re:[Thinkpad] Anybody know? Is R30 USB 1 or 1.1?
> >> From: "Scott Matthews" <scott@turnstyle.com>
> >> To: "Jonathan Kelly" <jcrkelly@gmail.com>
> >> Date: 11/3/2007 9:34 AM
> >>
> >>> hmm, also from Wikipedia (http://en.wikipedia.org/wiki/Mbit/s):
> >>>
> >>> Interface and device speeds:
> >>> USB, Low speed (1.0) -- 1.5 Mbit/s -- 0.18 MB/s
> >>> USB, Full speed (1.1) -- 12 Mbit/s -- 1.5 MB/s
> >>> USB, Hi speed (2.0) -- 480 Mbit/s -- 60 MB/s
> >>>
> >>> And the current version of Wikipedia's USB page
> >>> (http://en.wikipedia.org/wiki/Usb):
> >>>
> >>> USB supports three data rates:
> >>> A Low Speed (1.1, 2.0) rate of 1.5 Mbit/s (192 KB/s)
> >>> A Full Speed (1.1, 2.0) rate of 12 Mbit/s (1.5 MB/s)
> >>> A Hi-Speed (2.0) rate of 480 Mbit/s (60 MB/s).
> >>> (no mention of USB1)
> >>>
> >>> Does a USB 1 port become a USB 1.1 though a driver update, or does a
USB
> >>>
> > 1
> >
> >>> port have different electronics?
> >>>
> >>> I'm just trying to figure out whether the USB on an X20 and R30 will
do
> >>>
> > 12
> >
> >>> Mbit/s, or just 1.5 Mbit/s -- and I can't seem to find anything that
> >>> documents it!
> >>>
> >>> Confused! -Scott
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>> Weren't you just asking this about an X20 the other day?
> >>>>
> >>>> Also -- do you mean 1.1 vs. 2.0?? There aren't any speed diffs
between
> >>>> 1.0 & 1.1. Just some fixes.
> >>>> From http://en.wikipedia.org/wiki/Usb#Version_history :
> >>>> USB 1.0: 1996, 1.5 & 12 Mbit/s
> >>>> USB 1.1: 1998, 1.5 & 12 Mbit/s
> >>>> USB 2.0: 2000, 1.5, 12 & 480 Mbit/s
> >>>>
> >>>> -------- Original Message --------
> >>>> Subject: [Thinkpad] Anybody know? Is R30 USB 1 or 1.1?
> >>>> From: "Scott Matthews" <scott@turnstyle.com>
> >>>> To: thinkpad@stderr.org
> >>>> Date: 11/3/2007 8:25 AM
> >>>>
> >>>>
> >>>>> I can only seem to find things saying that R30 has USB, but not
> >>>>>
> > whether
> >
> >>> it's
> >>>
> >>>
> >>>>> USB 1 or 1.1
> >>>>>
> >>>>> Anybody happen to know?
> >>>>>
> >>>>> thanks, -Scott
> >>>>>
> >>>>> _______________________________________________
> >>>>> Thinkpad mailing list
> >>>>> Thinkpad@stderr.org
> >>>>> http://stderr.org/cgi-bin/mailman/listinfo/thinkpad
> >>>>>
> >>>>>
> >>>>>
> >>>
> >>
> >
> >
>
>

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Received on Sat Nov 3 09:03:09 2007