This part of EN 50518 specifies the minimum requirements for the design, construction, and functioning 99 equipment for premises where the monitoring, receiving and processing of (alarm) signals generated by one or more intruder and hold-up alarm systems takes place as an integrated part of the total safety and security process. The requirements apply for applications in a remote configuration where multiple systems report to a single or multiple Alarm Receiving Centre(s) (ARC) as well as to a single site facility aimed for the monitoring and processing of alarms generated by one or more alarm systems installed within the perimeter of that particular site.