Since the adoption of the PoE standard in 2003, power over Ethernet has evolved into a major and important powering scheme for network systems.  As the power levels and potential applications have increased so has the regulator scrutiny given to these systems. This course will examine the current state of PoE along with its benefits and challenges including looking at the response of codes and regulators to this power application. We will cover the challenges of voltage drop and connector failure and how to predict and avoid these problems. We will also introduce new power technologies such as Single Pair Ethernet and Digital Electricity, (Fault Managed Power).