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LMH0344: questions about lmh0344 input RL network

Part Number: LMH0344
Other Parts Discussed in Thread: SD3GDAEVK

Hi all
I'm using lmh0344 as 3g-sdi input equalizer.I have some questions as fllows
The inductor of the network is 6.2nH on SD344EVK,with a 0.5pF capacitor in parallel with it.while the inductor is 6.8nH,without capacitor on SD3GDAEVK.

my question is
1.What is the principle about selecting the value of the inductor?

2.The same question remains when selecting the SRF of the inductor

3.Is the capacitor necessary?when do I have to use a capacitor?

4.what is the impedance of the SDI- line?
on SD344 and SD384, does "Z75_4" means the impedance of the SDI- line is also 75ohm?
Is there any problem if this impedance is not controlled?