The 1RU Avenue frame accommodates any mix of up to three audio or video modules (except for the 5440 router expansion module). Modules plug into a universal motherboard, no special rear connectors are needed. In addition to the three module slots, there is a dedicated slot for the optional 5035 system control module. A universal in-line power supply is provided with each frame. Video and audio modules for conversion, distribution and synchronization plug into a universal frame motherboard. Plastic overlays for each module type are provided and slip over the corresponding BNCs on the backplane to identify the input and output designations on each type of module. As with the 3RU frame, the 1RU also can add an optional system control module for additional features and capabilities.