RJ45 Magnetic Modular Jacks Molex RJ45 Magnetic Modular Jacks incorporate wire-wound components (magnetics) in standard RJ45 jacks. In addition to connectivity, magnetic jacks provide signal conditioning, electromagnetic interference (EMI) compliance, and electrical isolation. Magnetic modular jacks support Fast Ethernet (10/100) and Gigabit Ethernet applications. Molex RJ45 Magnetic Jacks are available in Power over Ethernet (PoE) versions that support PoE functionally while allowing designers to manage power and ganged versions for high port-count gigabit switches and routers.