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DS90UB953-Q1: common choke for DS90UB953/DS90UB954 for STP mode

Part Number: DS90UB953-Q1

Dear Sir,

I have two questions for STP mode of 953/954,

1: is necessary to add common choke both sides of 953 and 954?

The cable length is over 3 meters, we have to pass EFT test, which couple noise to communication line, do common chokes  suppress this EFT noise?if not, how to pass EFT test for this case?

2: I use STP (shield twist pair wires) as communication line, but 953 and 954 are float,and isolated from EARTH ground, so 

How to connect the shielding braid of STP? 

Thanks.