Poul-Henning,
On 12/19/2015 10:11 PM, Poul-Henning Kamp wrote:
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In message <56757344.2020...@rubidium.se>, Magnus Danielson writes:
The isolation strategy says that the various equipments should only be
power grounded, as required for personal safety, and then have all other
grounding paths "galvanically separated" (thus, DC and power frequencies
separated in common mode).
The mesh strategy says that you extend the grounding of the power ground
with additional grounding with every cable and additional grounding
cables.
Please bear in mind that there is a *huge* difference between
single-ended (as in: RF-Coax-BNC) and balanced (as in: Audio-Twinax-XLR)
for both of these scenarios.
While you can get away with the isolation strategy with balanced,
because you have high CMRR inputs, there is nothing to "take care
of" the ground potentials in the single-ended mode.
Oh yes, indeed. I've worked both fields.
As a reference, Ethernet is designed to work in an isolation BN setup,
[...]
That is actually a new thing, the original Ethernet was 1/2" coax
and ground-loops and lightning damage was the order of the day.
Well, it's been a long time since that was Ethernet.
The main reason Ethernet went balanced was actually for fault
isolation (star-topology vs. bus) and signal quality (IT people
were horrible at "sharking" and crimping coax.)
The way they destroyed yellow cable with their attempts to drill for
their vampire... yes. I've seen that too.
Cheers,
Magnus
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