The DFC function is available for all VersaClock 3S product options. It can be configured by user customization or factory programming. IDT Timing Commander™ software is the tool to develop the configuration. After configuration is complete, if one desires the factory programming settings as the default of the device, a settings file (.tcs) can be submitted through the IDT website customization page. You may also contact IDT to discuss and work through any specific device requirements. For other questions not addressed by the Knowledge Base, please submit a technical support request.