Introduction

Power over Ethernet (PoE) is an evolving technology designed to deliver power and transmit data on an Ethernet cable at the same time. Modeling after the technology used in telecommunication systems which supplies power to telephones, PoE powers network devices without the need of AC electrical outlets. By eliminating the power cords and the power infrastructure, this technology greatly simplifies the wiring and deployment matters and brings lots of convenience and benefits in home, office, and industrial environments. This document briefs PoE technology and discusses the concerns for practical PoE deployment especially in industrial environments.

Power Sourcing EquipmentNominal Supply: 48V Operation Range: 44V~57V Maximum Load: 350mAPowered DeviceEthernet Cable0~100m, 20
Ω max allowed Minimum Power Offering: 44Vx350mA = 15.4WMinimum Power Available:15.4-0.35Ax0.35Ax20
Ω = 12.94W

Figure 1. Typical PoE Installation

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