On 18 Jul 2013 07:45:58 GMT, mick wrote:

As for cat5 being balanced, look at it this way: both wires in the pair
are being moved up and down in voltage at 50Hz by mains hum. Data is
carried in the difference between the voltage on the pairs.

Agreed.

At some point the 1s and 0s become 1s and 1s, as the hum voltage
overcomes the differential voltage at the top and bottom ends of the
50Hz waveform.

How? Show the maths.

--
Cheers
Dave.