Power Over Ethernet Interoperability Guide

Evolution of Overload/Short-Circuit Perspective

Looking closely at the standards, we will see that terms like I_CUT, I_OVLD, I_PEAK, I_LIM and so on, are used sometimes interchangeably, and sometimes rather differently too in subtle respects. Same applies to their associated times like T_CUT, T_OVLD, T_LIM, and so on. It can get rather confusing at times. To simplify our basic understanding, we must first note, that though the precise value and meaning of some of these terms may have been changing somewhat over past/present and evolving standards, we can make some commonsense and unifying observations. Besides, there are some commonalties too.

In the AF standard, the normal continuous operating current was called I_CONT. In the AT standard it became ...