USB2 device

[Wes Peters]

On Monday 29 March 2004 20:10, Michael E. Mercer wrote:
> Julian,
>
> It works if I plug it directly into a usb port on my PC. But it does
> not get seen if I plug it into a SIIG SlimHub 2.0.
>
> Any ideas?

Yeah, look at the power requirements:

> > jtest# usbdevs -v
> > Controller /dev/usb0:
> > addr 1: low speed, self powered, config 1, UHCI root hub(0x0000),
                       ^^^^^^^^^^^^
> > Intel(0x0000), rev 1.00
> >  port 1 powered
> >  port 2 addr 2: low speed, self powered, config 1, HP ScanJet
                               ^^^^^^^^^^^^
> > 6200C(0x0201), Hewlett-Packard(0x03f0), rev 1.00
> > Controller /dev/usb1:
> > addr 1: low speed, self powered, config 1, UHCI root hub(0x0000),
                       ^^^^^^^^^^^^
> > Intel(0x0000), rev 1.00
> >  port 1 powered
> >  port 2 powered
> > Controller /dev/usb2:
> > addr 1: low speed, self powered, config 1, UHCI root hub(0x0000),
                       ^^^^^^^^^^^^
> > Intel(0x0000), rev 1.00
> >  port 1 powered
> >  port 2 powered
> > Controller /dev/usb3:
> > addr 1: low speed, self powered, config 1, EHCI root hub(0x0000),
                       ^^^^^^^^^^^^
> > (0x8086)(0x0000), rev 1.00
> >  port 1 powered
> >  port 2 powered
> >  port 3 powered
> >  port 4 powered
> >  port 5 powered
> >  port 6 addr 2: low speed, power 200 mA, config 1, JUMPDRIVE
                               ^^^^^^^^^^^^
> > PRO(0x0200), LEXAR   MEDIA(0x05dc), rev 0.00

This has to be plugged into a powered port.  On a USB hub, this means the 
hub has to have it's own external power supply, typically a wall-wart.  
The ports on your computer are typically powered and should be able to 
power a 200 mA device with no problem.  If this is a tiny hub used with a 
laptop, see if you can find one that has a battery bay.

-- 
         "Where am I, and what am I doing in this handbasket?"

Wes Peters                                                  Softweyr LLC
wes at softweyr.com                                    http://softweyr.com/