On 24/06/2020 06:51 pm, The Natural Philosopher wrote:
> On 24/06/2020 16:22, David Higton wrote:
>> In message 
>>            The Natural Philosopher  wrote:
>>
>>> On 23/06/2020 22:22, David Higton wrote:
>>>> In message 
>>>>             Michael J. Mahon  wrote:
>>>>
>>>>> More likely, capacitance between lines of a longer cable slows signal
>>>>> transitions, eroding signal margins.
>>>>
>>>> Please, learn transmission line theory.
>>>>
>>>> David
>>>>
>>> Is there any evidence that a USB cable behaves as a transmission line?
>>
>> All cables behave as transmission lines.  So do PCB traces.
>
> Well no, they don't.
> a single signal wire with the earth/return via the other side of the
> world is so far from a transmission line as to render the notion 'not
> useful'

I know fuck-all about transmission line theory, but I know when
someone's being a dick.

>
>>
>> There are some situations where it isn't necessary to treat them as
>> such, but USB isn't one of them.
>>
>> David
>>
>
>



--

Chris Elvidge, England

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