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DP83848LFQ: how to link the pin?

Part Number: DP83848LFQ

Hi all:

        When I use DP83848LFQ in the car, I have some questions want to consult you. 

Following will show the question:

1, we use a RJ45 that integrate with transformer, my question: how to link the number 8 pin? tie to ground or floating?  because we don`t have earth ground in the car, it confuse me.

2, for the LED ,the RJ45 has two LEDs, how to tie two LEDs to pin of DP83848LFQ?

Thank you so much!