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Ethernet - Galvanic Isolation
Ethernet - Galvanic Isolation
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Old 28th October 2009, 09:21 AM   #1
soundcheck is offline soundcheck  Germany
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Default Ethernet - Galvanic Isolation

Hi folks.

We discussed USB isolation recently over here. Though I don't think ethernet isolation has been discussed so far.
The subject I'd regard almost as important as USB isolation.
If you -- I do -- run a wired home network, you'll for sure generate pretty awful groundloops. These might have a certain impact on your audio performance.
Your file server usually does not sit on your clean audio power rails - you actually don't want them in the audio environment.

By default the ethernet ports are isolated with transformers. However - ground loops from shielding still exist.

We all know what polluted grounds can do to the system.

The question is now what's the best way to get rid of them.

1. Take off the shields/grounds from the receiving end
2. Commercial Isolators (Checkout the circuit drawings)
3. The DIY version of 2.
4. Anything else? It should be "affordable" - therefore no fiber and deliver "high performance" - therefore no wireless?

What's your opinion about the subject? Feedback welcome.

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Old 28th October 2009, 09:52 AM   #2
Michael J is offline Michael J
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ethernet optocoupler - Google Search

That sort of thing?
If ya got 'em, bridge 'em.
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Old 28th October 2009, 01:27 PM   #3
wwenze is offline wwenze  Singapore
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My home ethernet uses unshielded twisted pairs. What is yours using?
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Old 28th October 2009, 02:18 PM   #4
DigitalJunkie is offline DigitalJunkie  United States
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FYI,most every ethernet interface *IS* isolated by small pulse transformers. Take a peek near the jack on a NIC,or router.
Consider long runs from one end of a building to the other..they already thought of that.
Shielding may be an issue in some cases,but it's not commonly used in residential settings.
Some equipment has it isolated with a capacitor,from the shield to earth/case ground-there shouldn't be any ground loops.If there are,lift the shielding at one end.
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Old 29th October 2009, 01:05 AM   #5
star882 is offline star882  United States
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Isolate the audio with a fiber optic cable. That will work if you can use the digital output.

In my experience, interference is actually not very likely.
"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
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Old 29th October 2009, 11:20 AM   #6
phofman is offline phofman  Czech Republic
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Shielded twisted pair (STP - unlike UTP) is a perfect cable for S-VIDEO I have not seen STP used in larger network installations and I would be very surprised if people had their homes wired with STP.
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