D41 — ETH-05 magnetics keep-out like XTAL-04

Decision

ETH-05 (no copper under discrete Ethernet magnetics) becomes a generated keep-out like XTAL-04: tracks, vias and zones on the magnetics' side and the adjacent copper layer where the magnetics have no pads, at confidence ≥ apply, used by the router only with --component-rules on; RJ45 jacks with integrated magnetics get none

Alternatives

A void on every layer; a void under MagJacks too

Reason

The catalogue says "same, adjacent" and "not required under integrated-magnetics RJ45" (TI SNLA387); keeping the area off the pads' layer keeps the transformer's own pins routable