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| Infrastructure |
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| Surveillance |
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 Surveillance is the monitoring of the behaviour, activities, or other changing information, usually of people and often in a surreptitious manner. It most usually refers to observation of individuals or groups by government organizations, but disease surveillance, for example, is monitoring the progress of a disease in a community.
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| PA |
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 A public address or "PA" system is an electronic amplification system with a mixer, amplifier and loudspeakers, used to reinforce a given sound, e.g., a person making a speech, a DJ playing pre-recorded music, and distributing the sound throughout a venue or building. PA systems with a larger number of speakers are widely used in institutional and commercial buildings, to read announcements or declare states of emergency. |
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| Access Control |
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 Access control is a system which enables an authority to control access to areas and resources in a given physical facility or computer-based information system. An access control system, within the field of physical security, is generally seen as the second layer in the security of a physical structure.
Access control is, in reality, an everyday phenomenon. A lock on a car door is essentially a form of access control. A PIN on an ATM system at a bank is another means of access control. The possession of access control is of prime importance when persons seek to secure important, confidential, or sensitive information and equipment. |
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| Gate Automation |
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