The NK-VRC Virtual Routing Core adds a virtual routing solution to any NK routing switcher system. Virtual routing is an important requirement in larger routing systems, especially those with multiple levels. The NK-VRC offers up to 1,000 each virtual sources and destinations. Virtual routing refers to the ability to assign physical sources and destinations to virtual sources and destinations. Without the NK-VRC, inputs 1 on each level are tied to each other; for example, Video input 1 is tied to Audio input 1. Adding the NK-VRC allows these levels to be flexibly assigned, for example Video input 1, and Audio input 2 can be tied to each other. This allows flexible wiring of sources and destinations to the various levels of the router and best flexibility in terms of setting the system up for easy use.