To avoiding the various Ethernet devices may damage with surge voltages by lightning strikes. PLANET releases an Ethernet lightning arrest box for preventing the lightning strike situation which appears in current Ethernet environment.The Ethernet lightning arrest box, ELA-100, provides two passive 10 / 100 / 1000Base-T interfaces for connection of two Ethernet devices and one ground position for earthed. The ELA-100 Ethernet lightning arrest box is the ideal solution to prevent damages of Ethernet devices by lightning strike with surge voltages.