ETHERNET port surge voltages and currents

This document simulates Ethernet port voltages and currents due to magnetic and direct surge coupling. Examples of the resultant equipment port impulse current paths for a Smith termination, capacitance and insulation voltage limiting, are shown and discussed.



IEEE ETHERNET protection considerations

IEEE Ethernet configurations and their protection

This document describes various IEEE PoE (power over Ethernet) and PoDL (power over data line) configurations and the expected voltage and power levels. Based on these levels the various protective functions that may need to be employed are discussed.



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)




Ethernet isolation/insulation testing

IEC Technical Committee 109: Standards on insulation co-ordination for low-voltage equipment

This presentation was prepared to describe the IEC Technical Committee 109 and the related Technical Committee 42 approaches on insulation coordination. The IEC TC 109 approach is then compared with the isolation (insulation) test entries of IEEE std. 802.3, IEC 60950-1 and GR-1089-CORE, Issue 7. The preferred values of insulation test withstand voltage are established, together with 1.2/50 impulse reference options and test procedure options.



Ethernet Surge Protective Device (SPD) design considerations

This document defines the common-mode, common mode to differential mode conversion and differential mode surge parameter and test circuit requirements of an Ethernet port primary protector. The preferred surge generator voltage levels are 2.5 kV, 6 kV and 12 kV, but the test circuits can be used for any surge voltage environmental. Power over Ethernet (PoE) feed requirements are also given.