Scott Ferguson wrote:
The term "balanced" is often confused or mystified by electronic
engineers too, but if you drive and receive two wires with equal
impedance, and compare the signals to each other and not to (local) GND,
that is a balanced transmission.
I suspect some of the confusion (in this thread) comes from the
difference between an ideal balanced state, and a non-functioning state.
[...]
More importantly - the 'phone system, particularly the outsiders view of
it, is not particularly relevant to the "serial connection" cabling
question. :-)
[...]
Note: the opinions and experiences of telecommunications technicians,
and Complex Data Testers may differ from that of textbooks ;-p
I don't want to go deeper in this flame, since these things are cleary
stated in standards and textbooks, the priciples were invented at least
one century ago. The opinons doesn't matter, only the physics.
Those who think it's the best idea to transmit RS-232 signals in UTP
cables, I recommend further learning in this area.
Or if you don't believe in textbooks, just try it! Try unshieled cable,
try shielded, wire-by-wire shielded, TP cable, and try the same TP cable
with RS485 transceivers (and surprise...)
Interconnecting two line-level audio equipment is even more expressive,
you obviously will hear the difference!
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