by Brian Roth, Antaira Technologies
Power over Ethernet (PoE) has become a hot term that is frequently referenced but not completely understood.
Electricity+Control, June 2016 (pages 36 – 38)
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There are many different acronyms and subtle differences used in the PoE arena that can quickly confuse and frustrate even advanced users. Some of the more common differences are multiple standards, varying power outputs and standard Ethernet restrictions as well as more advanced management features available with respect to PoE. Despite all of the naming rules and subtle confusion, PoE has been widely adopted owing to the challenges it has overcome and simplicity it has provided. A new technology, now referred to as PoE, it was first developed in the year 2000 by Cisco to reduce noise issues in the emerging VoIP phone system. PoE quickly took off and by 2003 the first PoE standardisation was developed to create uniformity among all PoE device manufacturers. PoE is beneficial over standard Ethernet network communication because of the reduction in both the equipment needed and wired connections to the devices. Why run both an Ethernet wire and a power cord to a unit when one Ethernet wire can work?
• Power over Ethernet (PoE) is a hot term that is not entirely understood.
• PoE is used for all devices within the PoE market when it should only be used for Power Sourcing Equipment (PSE) and Powered Devices (PDs).
• PSE is a switch or power injector and a PD is the unit that requires power through the Ethernet cable to turn on.
Read the full article on Ins and Outs of PoE in low res PDF format.