LANs are naturally susceptible to several sources of lethal transient voltages, according to the IEEE 802.3 specification. That's why we designed the Model 531 series LAN surge protectors. Our Model 531 thin Ethernet surge protector guards thin coax network cards, repeaters and other devices against data loss and hardware damage due to data line surges. The Model 531 installs between coax cable and the device's BNC port. Harmful surge energy is diverted to chassis ground?away from sensitive components?through a braided metal strap. The Model 531 comes in two versions: in-line BNC, and a replacement ?T-splitter?. For protection of backbone hardware, we offer the Model 530, with N-type connectors.