[mythtv-users] OT: USB inductance (or other) problems with external peripherals

Raymond Wagner raymond at wagnerrp.com
Tue Oct 15 14:45:09 UTC 2013


On 10/15/2013 10:25 AM, Stephen P. Villano wrote:
> It isn't always impedance causing a problem, especially with USB. USB 
> uses a lower frequency than gigabit ethernet.
> But, one can suffer from ringing on long runs, secondary to inductance 
> in the line.
> That is why many long length USB cables come with built in Schmitt 
> triggers as buffers.

Define "long runs", as you're not allowed to have a USB cable longer 
than 16'.  The only ethernet runs I have that short are the ones in my 
basement, to devices mounted on the same wall as my switch.


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