Something intresting came up last week here at work and it was that I patched up a network connection to patching panel, at the same time the equivalent network switch started lighting orange first and after a while lighted green. This is normal if there is a machine that is ON on the other side(where the cable ends up to), but the point here was that the machine was OFF and was just connected to the electric contact on the wall. So it means although the machine is off, but the signal can already be sent and it is logical as long as the machine can be turned on by a signal on network.
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