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Diodes are semiconductor components made from a P-type (or metal in Schottky diodes) and N-type material (usually silicon, but germanium, selenium, and gallium arsenide can also be used), that allow current to flow in one direction only.

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Building a passive ethernet hub with anti-parallel diodes

I'm clueless too, but one thing the diodes do is create an hysteresis loop which probably suppress noise under 0.7V. …
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