Galvanic isolation revisited.

@mitch2 I use the fiber converter to create a surge DMZ.  It separates my cable router from my internal Ethernet devices.  Otherwise my Pi / Roon streamer is just going to have to cope with the network as it is.

It seems Mouser is carrying some of them now, but those prices ... 😫

What I do like about them is they are taking the opposite approach of a lot of network surge protectors. From what I’ve been reading about lightning damage in Ethernet networks, the problem seems to be that lightning finds too easy of a path to ground, and surge protectors with ground connections want to make it even easier. When the surge protector trips, a huge current flows and anything in that path is toast.

These do the opposite and add ~ 6kV extra isolation with each isolator. A really good idea right after your cable modem. OTOH, at these prices using a fiber optic adapter ($60 for 2 + cable)  to create an air gap is going to become very affordable.

Interesting.

Ethernet is inherently galvanically isolated. The reason for this probably has to do with the long distances it is designed to cover. You can’t be transmitting a signal with different ground potential references very well, so there are isolation transformers on either end of every twisted pair in an Ethernet cable (PoE may be different).

What the EMO seem to do very well is add a LOT of protection against lightning/power surges breaking through, as well as low frequency (audio and power) attenuation.

I would totally want to put one of these between my cable modem and Wifi router at least to reduce the chance of lightning induced surges.

How much was it? And how did you purchase?