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The server system 164 receives one or more video streams 504 from the video source 501 and optionally receives event candidate information 502 such as event start information e. g. , motion start information and source information 503 such as device settings for a camera 118 or 106 e. g. , a device profile 3165 for camera 118 or 106. In some implementations, the event processor sub module 3146 communicates with the video source 501.security door systems
On the other hand the ionization type smoke detector is more sensitive to flames than to smoke. It sets off an alarm faster than a photoelectric or optical beam smoke detector once it detects fire. Therefore it is best used to detect smoke from fast flaming materials like paper and wood. It is also cheaper to manufacture. Compared to photoelectric smoke detectors, it consumes less power so a small battery can power it for month and is independent of external wiring. Since ionization type smoke detectors can detect particles smaller than smoke particles, they are prone to false alarms. Ionic smoke detectors use a radioactive isotope americium 241, and rules on proper disposal vary in each region. Some European countries have banned ionic smoke detectors. Aspirating smoke detectors ASD These are lesser known compared to ionic and photoelectric smoke detectors. It is best for rapid smoke detection is crucial like in a room filled with combustible chemicals and gases, and even tobacco. Pipe networks can be constructed leading to ASDs that can easily be hidden.