What type of alarm system is owned and located within the installation being protected?

A proprietary system is designed and maintained by the organization that owns the facility being protected. This type of alarm system is installed directly within the premises and is specifically tailored to the needs of the installation, ensuring that the organization has complete control over the alarm system's design and functionality. Such systems typically allow for quick responses to incidents, as they are monitored and managed by the facility staff, enhancing security awareness and response times.

Central station systems, as a contrast, involve monitoring by an external security company that is responsible for alerting emergency services or personnel when an alarm event occurs. Local alarm systems activate alarms within the premises but may not provide comprehensive monitoring or integration with other security measures. Bell-sound systems are primarily focused on alerting residents or personnel within the vicinity but lack the advanced features and capabilities of proprietary systems. Therefore, the proprietary system stands out as the most fitting answer to describe an alarm system that is owned and located within the installation being protected.