The symbol I'm looking for is the one inside the circle of the schematic. I thought it could be some special kind of fuse, but I haven't seen anything like this before, nor been able to find anything similar myself. Regarding this schematic, I would also like to ask a few questions:
- What's the purpose of connecting Vcc (1.8V) to the RJ-45 connector? Someone said that it could be because the output of the PHY transceiver was open drain. If that's the case, would that mean that if my transceiver is fed with 3.3V, I should supply the same voltage to the Ethernet connector?
- About the RC filter dividing those 2 grounds. As far as I knew, the higher the frequency of the transmission, the better to be those 2 grounds directly coupled (I know that the higher the 'f', the lower the impedance will be). Anyway, I thought that that small impedance could be enough reason for the cable to emit EMI. Why is it done this way? Does the shielding of the connector provide enough protection to avoid this?