DD243: 2004 (Confirmed Alarms)

This document was produced to reduce the number of false calls to the police and to which the police will respond. It refers to all intruder alarm systems that are installed with remote signalling systems to an Alarm Receiving Centre (ARC).

DD243: 2004 was produced to reduce the number of false calls to the police and to which the police will respond. It refers to all Intruder Alarm systems that are installed with a communication system to an Alarm Receiving Centre (ARC).

The methods of alarm confirmation are:

• Sequential — a signal is sent to the ARC when the alarm has been activated. The ARC will then wait for a second detector to be activated, providing confirmation of a break–in.
• Audio & Sequential — microphones are strategically sited throughout the protected premises. When the alarm is activated the ARC can "listen" to the premises, and if they hear sounds of a break–in, this is passed to the police as a confirmed alarm.
• Video & Sequential — cameras are used in place of microphones. The ARC will monitor the cameras when the alarm is activated, and confirm the activation if they see evidence of a break-in.

In addition to the above technologies, confirmation of an alarm system can also extend to signalling where dual path transmission is installed, such as Redcare GSM, in the following forms:

• Transmission fault (e.g. line cut) followed by alarm signal (or vice versa)
• 2 transmission faults (line cut & gsm failure)

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