The SDV-HUB is a 1RU device made to support up to 4 third-party tuning adapters. Each tuning adapter can support up to 6 switch digital services for a total of 24 programs in a custom channel lineup. The SDV-HUB connects to the NXG Master Controller module via the GbE RJ45 port, providing a communication link to the NXG CableCARD® module. Switch Digital Programs for viewing can be selected in the NXG CableCARD® module user interface.