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DP83848-EP: About series resistor on the TAbout

Part Number: DP83848-EP

Tool/software:

Hello
We have a question regarding the TPI Network Circuit in the DP83848-EP datasheet.
In this circuit diagram, two 49.9Ω resistors are inserted between RD+/‐ and TD+/-. We believe these are termination resistors.
Apart from these,
is it necessary to add a series resistor to the TX line for impedance matching?
Or is the series resistor built into the IC?
We would like to ask for advice from the IC manufacturer.
Best regards,
Tsuji