The power to the radios (at least the “main” radios) is usually supplied through by a UPS to prevent an overall radio system failure from a mains power outage but there are several options available to protect against a radio failure. Main and Standby radios can be installed with an antenna changeover device so that if one radio fails the other will take its place. The alternative to that is to supply a tuneable standby radio that can be manually tuned in case of a single radio failure. The latter is a cheaper option as not every radio requires a “standby” but a “main and Standby” radio assures that every frequency is protected.