V4

• 1. LOCAL ALARM SYSTEM ​ - It has circuits within the secured areas that are directly connected to audio o visual signal-producing devices such as electronic annunciators, bells or sirens.​
• LOCAL ALARM SYSTEM ​ -

  • The signaling devices are normally mounted on the exterior of the building, or in large buildings at an interior location, where they will be audible or visible at a reasonable distance. It should be protected against weather or tampering.​
• 2. CENTRAL ALARM SYSTEM​ -

  • The central-station alarm system is connected to an alarm panel in a centrally located station such as local police station or guard service that provides monitoring devices over telephone lines.​
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• CENTRAL ALARM SYSTEM​ -

  • When an alarm is activated, the monitoring station initiates a response by either calling personnel designated for the area or by dispatching guards and/or police to the location.​
• 3. PROPRIETARY ALARM SYSTEMS​ -

  • The Proprietary Alarm Systems is similar to the central station type, except that the alarm panel is located in a manned guardroom on the protected premises.​
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• PROPRIETARY ALARM SYSTEMS​ - The guard force monitors the system and responds to all alarm. The alarms can also be wired to a central station or nearby police station via telephone wires for backup response.​
• ANNUNCIATOR​ -

  • It sounds an alarm by visible or audible signals and usually indicates the location of the protected item or premises.​
• ANNUNCIATOR​ -

  • The alarm signal is transmitted to an annunciator panel that is constantly monitored or to a local signaling device.​
• ANNUNCIATOR​ -

  • Local Annunciators usually employ an audible bell, siren, and/or bright beams of light to deter the intruder and to attract the attention of  persons in the immediate area.​
• ANNUNCIATOR​ -

  • It may be combined in a system that announces alarms both locally and remotely.​
• LINE SUPERVISION​ -

  • The telephone or dedicated lines that transmit the alarm signals from the protected area to the monitoring station must be protected to prevent interruption of the alarm signal. To ensure such integrity, the transmission line should be electronically supervised.​
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• LINE SUPERVISION​ -

  • It refers to the protection of various signaling techniques incorporate, such as random tone patterns or data encryption.​
• • Lacing can protect walls, doors, and safes against penetration.​
• Lacing

  • It is closely woven pattern of metallic foil or fine brittle wire on the surface of the protected area. ​​