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Understanding?

Posted by fmak (A) on September 11, 2014 at 23:58:25

In Reply to: RE: USB cable length-Audioengr posted by Tony Lauck on September 11, 2014 at 20:25:37:

''The impact of reflections depends on where the reflections fall in the digital waveform. When a reflection hits a point where the waveform is transitioning from a 0 to a 1 or conversely then it will affect the time the receiver detects the transition ("jitter"). This effect depends on the length of the cable from the point of reflection compared to the wavelength of the bits on the wire. With a much higher clock rate (USB 2.0) the wavelength will be much shorter.''

So what? You state the obvious which does not contradict what audioengr said. How and where the reflections affect transitions depend on a given system, impedance matching, detector performance, cable return loss etc.

I would advise you to stop making simplistic, 1D theory and irrelevant observations so very frequently.

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