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Collisions in CSMA/CD Ethernet

I am confused about collisions in CSMA/CD Ethernet. When would a jam signal be sent? Why are jam signals sent? If two simultaneous packet transmissions interfere with each other, the two transmitting ...
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1answer
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how does a NIC actually detect a collision when using CSMA/CD?

I understand that a network card detects collisions because their signal has a higher amplitude than normal signals. But why is that signal of higher amplitude? For example, say we have the simplest ...