Standard Modular Jacks Offering one of the largest product breadths of right-angle, vertical top and bottom entry modular jacks in Cat 3 and Cat5e ethernet speeds, Molex has solutions to your design requirements. CAT 3 modular jacks are suitable for 100Base-T (Fast Ethernet) applications. Molex’s extensive breadth of Cat3 products offer exceptional performance and reliability for voice, data and networking applications. With more than 1000 different parts, Molex’s broad range of Cat5e Modular Jacks and Plugs provides versatile solutions to support the high-speed performance requirements of Gigabit Ethernet applications.