CITEL MJ8-POE-A RJ45, 8W+Shield+G, POE for Industrial Communication Datasheet Contact Us Data Network: 1Gbps, RJ45, 8W+Shield+Ground Application: Cameras, Ethernet Switches, Wireless Radio In order to limit the effects of lightning or switching transients to acceptable levels for critical equipment and installations, the most effective solution is to install a protection device against these events. We call this an "SPD" (Surge Protective Device), they are deployed into the wireless network at the input to a distribution bus or directly at a sensitive load. The purpose is to harmlessly divert damaging surges away from your sensitive equipment before any disruption occurs.