A MagJack, or Integrated Connector Module (ICM for short) is a combination of up to 10 discrete components. They include: The RJ45 connector, the impedance matching transformers, 2 LED’s, 4 termination resistors, 1 high voltage capacitor, and often common modes chokes as well.
Today’s ethernet or LAN hardware engineers have two ways to lay these components out on their boards. First, they can do it “discretely.” That is, they can lay out each of the parts I mentioned indiv...
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