High quality surge protection, dedicated to Gigabit LAN networks, based on 5, 5e and 6th Category cables. The devices have been designed using the latest circuit design and simulation methods as well as modern high-quality components. Multi-layer PCB, optimal tracks parameters with perfect lead of individual pairs and impedance control during production, allowed to eliminate many factors affecting the deterioration of signal transmission quality. The devices have high strength for high pulse currents, minimal crosstalk between the pairs and low attenuation. Above features allowed to fully qualify them to 6th category (4x 250MHz). Popular Gigabit Ethernet networks work on 4 x 125MH only , the quality inventory is important to maintain the reliability of large installations.