thanks for the document
but i still have questions.
if the grounds are separated, how the electrical potental of signal gnd(GND) can be ground(0V)?
due to the connector RJ45, GND_BS can be an earth ground(I understand).
from the schematice "PROC076A(001)_Sch" which is TI given.
GND_BS and GND_RTN and GND are still not connected.
how the GND_RTN and GND could have 0V potential?
Does GND_RTN need to be a 0V? if it doesn't need to. GND_RTN can be floating( I understand)
but How about signal gnd(GND)? i think it must be a 0V. if it is, i think it must be conncted to the GND_BS using bead(which is DC short)
but i can't see any connections between GND_BS and GND
Look forward to your answer as soon as possible