Re: [gentoo-user] Re: Which USB device on which controller?

[Dale <rdalek1967@gmail.com>]

Grant wrote:
>>>> I'm looking at the box of one of the webcams and it says "USB 2.0
>>>> compatible".
>>>>
>>>>         
>>> A USB 1.1 device _is_ "USB 2.0 compatible" because a USB 2.0
>>> will slow down and run at 1.1 speed.  Does the device say it's
>>> "high speed" USB?  "USB 2.0 compatible" generally means it's a
>>> USB 1.1 device.
>>>
>>>
>>>       
>>>> It's not a cable problem because the cable is built right into
>>>> the webcam.  I'm not trying to get the webcam to go faster
>>>> back and forth to the controller, I just need to make sure I
>>>> don't have both webcams on the same OHCI (1.1) USB controller.
>>>> I would think buying a USB expansion card would work, but I
>>>> have an EHCI (2.0) controller on this system and a second OHCI
>>>> (1.1) controller.
>>>>
>>>> Does anyone have any idea on this.  It really doesn't make sense.
>>>>
>>>>         
>>> Sounds like it's a 1.1 device to me.
>>>
>>>
>>>       
>> Yep, that's what it sounds like to me too.
>>
>> Dale
>>     
>
> But that's OK isn't it?  I don't need 2.0 speeds between each webcam
> and the controller, I just need the increased overall bandwidth of a
> 2.0 controller so one of the 1.1 webcams doesn't use all of it.  I get
> the feeling I have a misconception somewhere along the line here.
> Could someone straighten me out?
>
> - Grant
>
>
>   

If the camera is using USB version 1.0, or the slow connection, it won't
ever work as a 2.0.  It is just not capable of that.  It would be like
me wanting my old dial-up modem to connect to my ISP at 256K/s.  It
can't do that because it was not built to do that or has the hardware to
do it either.  Not to mention that my ISP would not be happy either.

I suspect that sort of like my IDE bus, when I have a old drive on the
same cable as a fast one, it is slower because of all the negotiating
that goes on between the different devices.  I may be wrong but I don't
think you are going to be able to get two cameras to work unless they
are both USB 2.0 or on a separate chip such as a expansion card. 

The camera is your limiting factor from what I understand. 

Dale

:-)  :-)