IEEE 802.3 Ethernet powering overview

The IEEE didn’t invent Ethernet, but the IEEE’s prodigious work since 802.3 -1985 has made, for many, the IEEE’s Ethernet standards the reference documents. By using the Ethernet twisted-pair cable to also deliver power simplifies system implementation in automotive, industrial, commercial, healthcare and domestic environments. Figure 1 shows the main elements of an Ethernet system feeding power over connecting twisted-pair cable. This document looks at powering configurations, power delivery levels and protection. (34 pages and 32 Figures)