POE BASICS AND BEYOND: WHAT EVERY ENGINEER SHOULD KNOW

Summary from the TLDR Dev newsletter

Power over Ethernet (PoE) delivers both data and power over standard Ethernet cables to devices like IP cameras and VoIP phones. This article explains the difference between endspan (PoE-enabled switches) and midspan (PoE injectors) devices, along with the evolution of PoE standards (IEEE 802.3af/at/bt) to support higher power levels.