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In Ethernet Magnetic part why we using chassis ground and separated choke primary side form common ground?

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    \$\begingroup\$ Your question could really do with more explanation, but the answer is probably: To avoid noise and current loops between systems. \$\endgroup\$ – Asmyldof Jun 29 '15 at 8:49
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Ethernet Magnetics are used for providing the isolation between the interface. The reason behind that is the safety and the different potential of linked system. Since the system can be on different ground level so we donot connect the primary and secondary side with the same ground.

The other reason behind that is if the cable gets short with a high voltage, PCB will be saved from getting damaged.

So basically the reason for providing the two separate ground is to isolate the two system.

If we connect the both end with the same GND as shown below, the system will not be isolated.

enter image description here

If we want to provide the isolation between the two system we should connect the system as shown below.

enter image description here

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