The DKM extender setup provides the widest range of possible combinations, which makes it easy to customize for your specific application. Modular KVM extender cards support DVI-D and USB HID for Fiber Optic connectivity. The DKM extender setup provides the widest range of possible combinations which makes it easy to customize for your specific application. These DKM components are part of a modular system. Contact Black Box FREE Tech Support for configuration and assembly to fit your application.