Need 100base-tx/1000BASE‑TX front end analog scheme
The Standards for Ethernet are pretty explicit. But they are behind a paywall. Like all standard papers. All that information is not so public, as its a fu...huge industry and a lot of people fill their pockets with it.
But anybody who pays, may read it. Convenient access unfortunately comes with costs
Also there are some books around which show common Ethernet circuits, parts of the standards. Of course excerpts in the net do not show the interesting parts.

Also you may note, the standards are clever and in most cases define just Interfaces and may present an example. There is no &quot;this is how you must do it&quot;.
But physics force that e.g. most Ethernet interfaces use a transformer combined with a common mode choke.
But you may find that industrial ethernet interface are much more hardened compared to the commercial stuff...

Buy the way, the internet is full of many examples. You may note that most are similar but have differences in the details...
https://duckduckgo.com/?q=ethernet+interface+circuit&amp;t=ffab&amp;iax=images&amp;ia=images