eXtreme™ Cat 6 High-Flex Patch Cords. eXtreme High-Flex Cat 6 Patch Cords are designed to be used in Cat 6/1-Gigabit applications and all frequencies from 1 to 250 MHz. Patch cords offer flexible, high-density patching. Cables support high-speed data applications. They reduce patch cord density in a 24-port patch panel by 38 percent when compared to typical Cat 6 patch cords.