I'm wondering why LED indicators are not used on patch panels and on keystone jacks.
I already know that usual LED signals are derived from a 16 bits pulsetrain used in the auto-negotiation mechanism of 802.3  

Two questions:

* is there a simple circuit (or simple integrated circuit) used to decode that pulsetrain?
* if there is no local power (as is the case with a patch panel), is there a way to get that power from the remote equipment (remote end of each of the 2 connected cables)?