Switch Port LEDs: What Do They TELL Us?

What Do the LED Lights on each physical port of a switch tell us? Is there an emergency? Do we need to be concerned?
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[@vrhb5491]

and what if both leds are blinking green every second a the same time

[@AceNetworker]

Probably means the port is operating at full capacity/bandwidth. Again, I would check the documentation on that model of switch/device to confirm what that means specifically