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ADM3053 series problem

ADM3053 series problem
1. In the figure, can R3 be footprint in 0603?
2. In the figure, is the value of R3 related to the communication rate?
3. In the figure, R4 is the TXD pull-up resistor. What is its purpose? Why is there no pull-up on RXD in the picture.
4. In the figure, the power of R1 and R2 resistors?
5. Is there a recommended common mode voltage similar to TI ISO1050 for ADM3053?