My design requires Ethernet TX/RX differential signals to be routed from Ethernet magnetics to VPX backplane connectors P1 & P2. As per Ethernet PCB design requirements the module signal ground should be isolated from Chassis ground of Ethernet signals. I am able to isolate the two ground planes upto the backplane connector. The requirement is that Ethernet signals on secondary side of magnetics should have chassis ground as reference and should never overlap with any other signal traces/ground planes. Since backplane connectors have signal ground pins to be connected the overlap between Ethernet signals and signal ground will happen. Which means the isolation is lost. What can be the solution for this issue?

  • \$\begingroup\$ It's a bit hard to follow without paragraphs and at least a simple illustration. \$\endgroup\$ – pipe Jun 12 '18 at 8:33
  • \$\begingroup\$ Attaching the illustration for your reference. As per Ethernet signal routing requirements the transformer secondary side Ethernet signals should be routed with chassis ground as reference and it should not cross signal ground. But since VPX backplane connector has signal ground pins at the backplane connector region, signal ground, chassis ground and Ethernet signals will overlap. We are occupying all the differential pairs of P1 and P2 connector for Ethernet signals. \$\endgroup\$ – Hafiz Jun 13 '18 at 9:40

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