The Viper 442 frame is a 19-inch rack-mountable unit (typically 3RU high, though sources suggest the similar Viper II is 3RU, while the 442 might be smaller and potentially fit in a single-rack-unit chassis based on form factor details on vendor sites) that serves as the central hub for Telecast's modular fiber optic system. It is designed to accommodate various hot-swappable I/O modules, which convert electrical signals to optical signals for long-distance transmission (over 20 km) via fiber optic cables. The signals are then converted back to standard electrical signals at the base location, such as a production truck or studio. The modular, "plug and play" design simplifies system setup and allows users to customize their configuration with different modules for video, audio, and data transport. The frame itself features a power bus system and an optional battery back-up unit for enhanced reliability in demanding broadcast and field environments.