[c-nsp] Galvanic isolation for Ethernet?

[Victor Sudakov]

Michael Loftis wrote:
> 
> Many RJ45 ports have integrated magnetics now (transformer) - external
> options are made by pulse, bel, halo, and many others.  As for
> external magnetics they're small - they don't need to be very large
> because they're not designed to be carrying current.
> http://www.pulseelectronics.com/products/lan has a dozen or more
> examples.

At first glance, these look exactly what I was asking for in the first
post, a transformer, non-powered, right? 

There are so many models however, it's not clear if there are such
ones could be placed between a regular UTP/FTP cable and regular
switchport.

> 
> >
> >> If you've enough common mode
> >> voltage to fault those out you may still be well short of "surge"
> >> voltages that are protected by most equipment.  You might improve the
> >> issue by re-terminating each end only leaving the "spare" copper pairs
> >> connected at one end of the RJ-45 (the switch end
> >> generally)...
> >
> > Sounds like magic but could you elaborate? I did not quite catch the
> > picture.
> 
> You remove the extra (non 100mbit/10mbit) pins from the far end, don't
> terminate them through, this sometimes is the path your stray ground
> currents take.

What to you mean by terminating/not terminating them?

And thank you a lot for your input.

-- 
Victor Sudakov,  VAS4-RIPE, VAS47-RIPN
sip:sudakov at sibptus.tomsk.ru