Transient surge energies from sources such as nearby lightning strikes, inductive load switching, ground loop currents, and electrostatic discharge are clamped by AC protectors into the shared communication ground, resulting in damage to expensive communication hardware. 612/624/648 Series includes: 12, 24, and 48 port, 19” rack mounted protection units that feature 110 punchdown to RJ45 connectors. CAT6 performance. Also available in configurations that offer protection for Telco and ISDN circuits.