Capacitors on center tap

[FreshmanNewbie]

I am using this connector which has the internal magnetics. And connecting it to an Ethernet PHY device.

In the datasheet, we can see, that it has internal capacitors of 100nF.

I went through this Connector (CIRCUIT E) which has internal capacitors of 10nF.

Can someone tell me what would be the impact of the 10nF and 100nF capacitors?

What would be affected if we increase or decrease the value of these capacitors?

 

[FreshmanNewbie]

Why do we add capacitors on center taps to the magnetics when connecting to an Ethernet PHY?



Also what is the reason on why we terminate the other side of the magnetics with a resistor and a capacitor?

 

[betwixt]

It is to keep the center tap at zero SIGNAL level while allowing the 'P' points to assume a different common mode voltage.

Brian.