What device is used to forward data from one LAN to another?
A router is a device used to forward data from one Local Area Network (LAN) to another. It operates at the network layer (Layer 3) of the OSI model and uses IP addresses to determine the best path for data packets to travel between networks. Routers connect multiple networks, manage traffic, and facilitate communication between different network segments. Reference: Axis Communications network design documentation and standard networking resources.
Which cameras have IR LED illumination built-in? (select two)
AXIS M3057-PLVE MkII and AXIS P1378-LE both have built-in IR LED illumination. This feature is crucial for enhancing visibility in low-light conditions or complete darkness, making them suitable for various surveillance applications. The built-in IR LEDs ensure that these cameras can provide clear images even in challenging lighting environments. Reference: AXIS M3057-PLVE MkII, AXIS P1378-LE
What is the maximum distance from a midspan to a camera requiring PoE+ (25.5 W)?
The maximum distance from a midspan to a camera requiring PoE+ (25.5 W) is 100 meters (328 feet). This distance limitation is due to the standard Ethernet cable length limit, ensuring effective power delivery and data transmission over the network.
In good conditions, a pixel density of 250 px/m (80 px/ft) is required for
In good conditions, a pixel density of 250 px/m (80 px/ft) is required for identification purposes. This means that at this resolution, the image quality is sufficient to identify individuals, objects, or other details accurately. Identification requires the highest level of detail among the common surveillance objectives (detection, observation, recognition, identification). This pixel density allows for clear and precise visual information necessary for identifying specific features such as facial characteristics or license plates.
The reason why the camera is not blinded by the headlights is that
The reason why the camera is not blinded by the headlights is that an IR-pass filter is in use. This filter blocks out visible light, including the bright headlights, and allows only infrared light to pass through. This is particularly useful in nighttime surveillance scenarios where the camera can rely on infrared illumination instead of visible light, ensuring clear visibility even in the presence of bright lights like headlights.
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