SN65HVD72: Extra components.

Part Number:SN65HVD72

We will need a simple communication protocol(RS-485) over a twisted pair(RJ45 CAT 5) for the new sensor and communicate to other PCB in the future. We have chosen to use the SN65HVD72DR,

1. Page 25 from the datasheet( http://www.ti.com/lit/ds/sllse11f/sllse11f.pdf ) shows the circuit with TVS being used and while page 3 the reference design (http://www.ti.com/lit/ug/sllu162/sllu162pdf ) of EVA kit does not used them . Are they necessary? Would simply extracting the design from EVA board be better?

1. In regards to the EVA kit, they have used a termination resistor of 120ohms. Would 100ohms be better choice for Cat5 cables?

Thank You