Network isolator Baaske MI 1005

[KSTR]

It's about common-mode noise coupling, not differential-mode signal coupling.
Tie all inputs lines together (including the shield of a STP cable when applicable), tie all outputs together (same). Then measure the capacitance from input to output, at low frequency (like 10kHz or lower). This is the relevant capacitance where the parasitic common-mode stray current can pass, which originated typically from isolated 2-prong SMPS supplies used somewhere.

 

[phofman]

Thanks. Common mode against what - the ground? I would not use an STP cable in this case, to avoid bringing the grounds of both sides close to each other, but that's just my "feeling". Thanks!

 

[KSTR]

A common-mode current will flow whenever the two sides do not have the exact same common-mode voltage. In other words, when there is a voltage difference then a current will flow as per Ohm's law.

Different common-mode voltages can form for any number of reasons, the most typical one is mains coupling at the power supplies of the connected devices. One supply might be 2-prong SMPS and has a ton of common-mode voltage, the other side may be earth grounded equipment. But it could as well be another 2-prong SMPS.

The larger the voltage difference (momentary, not just AC or RMS level) the bigger the balancing current will become, and further scaling this by coupling impedance. That's why low coupling impedance is a good thing when you can't force both sides to the same potential (by a low impedance short).

 

[phofman]

Thanks. So could it be like this?

No extra isolator - 2 x 30pF (average standard ethernet transformer inter-coil capacity) in series => 15pF total
The extra HV isolator - 2 x 30pF + e.g. 10pF (thicker isolation gap?) in series => 6pF total

 

[kchap]

Does this one have? IIUC it contains just signal transformers, rated for higher isolation voltage.
View attachment 510368
View attachment 510370

The pin out, as shown, is not compatible with TIA 568. TIA 568 pairs terminates on pairs on pins 1/2, 3/6, 4/5, 7/8. The M1 1005 isolator seems to show the pairs terminating on pins 1/2, 3/4, 5/6, 7/8.

I assume that is a documentation error as Baaske claim it supports 1000BaseT.

 

[Leeken]

Buy one,stick it in a billet alloy box,claim it does miraculous audiophile buzzword shit and sell for over 1k,bargain!

 

[phofman]

he pin out, as shown, is not compatible with TIA 568. TIA 568 pairs terminates on pairs on pins 1/2, 3/6, 4/5, 7/8. The M1 1005 isolator seems to show the pairs terminating on pins 1/2, 3/4, 5/6, 7/8.

Yes that diagram is not correct, otherwise the device would not work at all. But it shows the internals.

 

[Kal Rubinson]

Yes that diagram is not correct, otherwise the device would not work at all. But it shows the internals.

Depends on to what it is connected. From your own link, "The difference between the T568A and T568B pinouts is that pairs 2 and 3 (orange and green) are exchanged."

 

[phofman]

IMO the point of that diagram is that the device contains just four 1:1 pulse transformers. Of course one should use the version fitting the wiring standard one is using in his network.

 

[kchap]

Depends on to what it is connected. From your own link, "The difference between the T568A and T568B pinouts is that pairs 2 and 3 (orange and green) are exchanged."

Yes, it's all very confusing.

Standard Ethernet Cable

A End	B End	Role
T568A	T568A	Straight through
T568B	T568B	Straight through
T568A	T568B	Crossover

Most switches normally support Auto MDIx so crossover cables are normally required for host to host connections.

 

[silver12]

OK, just added to chain...(70eur) must do a test, because i added also new amp to system...but its dead silent...

 

[El Geffe]

I use one of those in front of my DEQX, not because it improves sound quality, I would not know because I never used it without, but to protect the DEQX Ethernet port from possible static discharge. I have lost Ethernet ports that way in the past. Without a working Ethernet port, the DEQX becomes practically unusable, because it will not even boot without a network connection. So in fact, I use it for what it was made for, patient safety