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Throughout history, humans have sought to protect their life, property and possessions. In early societies, guards, watchdogs, traps and even noisemakers provided security. Fire was used to baffle wild animals and keep them at bay. In fact, in the opening scenes of the movie, Raiders of the Lost Ark, you see a security system devised to apprehend its violators: When Indiana Jones tripped the mechanism, he was pursued by a huge, rolling boulder. As centuries passed and human accomplishments became more noteworthy, some rather engaging and sophisticated devices were developed to insure man's security. But until the discovery and harnessing of electricity, no device or protection scheme could be expected to provide any real degree of assurance or consistent peace of mind.

Classifying alarm systems

In terms of electrical alarms, the vast majority of security systems fall into three broad designs: local alarm, monitored systems and silent alarm.

* Local alarms: The local alarm is a configuration using an audible sound device (a bell or siren) and sometimes a visual one (a strobe light) to report a dangerous situation, be it an intrusion or fire (the two most common conditions), a gas leak or a flood. The notification devices are usually mounted outside the protected premises in order to be in full public view so as to be heard or seen once an alarm has been triggered. Mounting the signaling device this way serves as an effective deterrent to break-ins, especially in residential installations. READ MORE

Network Access and Remote Viewing
Network access is the ability to remotely monitor a video server across the LAN, WAN, or internet. A very important application for any DVR system is the ability to monitor live and access to recordings through remote access.

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