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 LEDs, 4 termination resistors, 1 high voltage capacitor, and often common modes chokes as well.
Todays 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 individually on the board, and this is the way it was typically done up until the late 1990s. The second, and I believe the better way, to attack this problem, is to use a MagJack, or Integrated Connector Module, from BEL.
The advantages to using a MagJack in an ethernet design are numerous, but I will outline what I believe to be the top reasons to consider this approach.
1. Maximize Avaliable Space. By combining up to 10 components into one housing, you can literally cut the real estate used on a PCB by more than 50%.
2. Maximize Efficiencyin engineering, purchasing, inventory management, and manufacturing. By using 1 component instead of 10, you can turn designs faster, simplify the...
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