Re: [Emc-users] USB hub random disconnection

[Jon E. <el...@pi...>]

Stephen Wille Padnos wrote:
>
> The shield is only required for USB2 cables.  In the interest of saving 
> a milli-cent, it's probably left out on anything that it isn't needed 
> for, such as a very low speed game controller (which probably doesn't 
> even need USB 1.1 speed, let alone USB2).
>   
Hmmm, I guess if you don't care if the FCC has your head on a platter 
(which the Chinese knockoff artists wouldn't care) then you can do 
that.  Since the cable COULD be plugged into a USB2 port, and the 
drivers will have the super-fast edge rates even when sending at 1.5 
KBits/second (low speed), I think it would still be a powerful radiator, 
and flunk even class A tests.  At "full speed" 12 Kbits/second, it is 
just illegal, as the limit is no clock whatsoever can be above 9 KHz.

I have no idea what sort of schlock the Chinese are pumping out, I can 
only imagine some of the consumer-grade stuff at Micro-Center is so 
awful it will barely work in the best environment.  Losing control of a 
CNC system is potentially dangerous, so I'd just avoid anything that has 
any potential for connection problems.

Jon