Understanding the RJ45 Jack

OLIMEX / ESP32-POE

ESP32 IoT development board with 100Mb Ethernet and 802.3 Power Over Ethernet (POE)

Apache License 2.0

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Understanding the RJ45 Jack #12

Open zgibson21 opened 4 years ago

zgibson21 commented 4 years ago

I have a question about why this particular RJ45 jack was used. I can see that is has the magnetics built in but why does it also have a diode bridge rectifier? Is the rectifier necessary?

TsvetanUsunov commented 4 years ago

please read https://en.wikipedia.org/wiki/Power_over_Ethernet DC power component uses same cable pairs as the AC data component, the bridge rectifier separates the DC from AC components.

thermseekr commented 1 year ago

I'm having a very hard time finding RJ45 jacks with integrated diode bridges. My usual sources are JLCPCB where I order my assembled PCBs from, and Mouser Electronics. Are there any other good sources you could share? Thanks!