Electrical Isolation for Lan

One of the basic requirements for a LAN magnetic interface circuit is to provide electrical isolation. This is achieved by the use of an isolation transformer. The isolation transformer electromagnetically couples signals (data) from the primary-side (PHY side) to the secondary-side (Cable side). Hence, the primary and secondary windings of the transformer are electrically isolated from each other. The transformer is designed to meet the Hi-Pot (high potential) isolation requirements defined in the IEEE802.3 standard (1500Vac or 2250Vdc between cable and chip side).