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Request for understanding of ADIN1100 RX-TX mixing and termination resistor topology

Category: Hardware
Product Number: ADIN1100

Dear ADI Experts,

  In the schematics of evaluation board, (file eval-adin1100ebz-support-pack) from website, we can see there are seperate parts marked for termination resistors and RX-TX mixing, respectively.  We don't quite understand these two parts of circuit design strategy.

We do have general understanding of termination for transmission line communication, but don't quite get why we design a 50ohm in series with Tx, and how it works with Rx path in detail. Would appreciate if someone can explain more these two circuit topologies.