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2. Pan–tilt–zoom camera - Wikipedia

   en.wikipedia.org/wiki/Pan–tilt–zoom_camera

   PoE PTZ Camera: A PoE (power over Ethernet) PTZ camera may be powered and connected to the internet with a single Ethernet cable, eliminating the need for additional wiring. Analog PTZ Camera: Analog pan-tilt-zoom cameras are used to record surveillance footage, which is then stored in a DVR. DVR functionality is essential for converting ...

3. Power over Ethernet - Wikipedia

   en.wikipedia.org/wiki/Power_over_Ethernet

   The original PoE standard, IEEE 802.3af-2003, [1] now known as Type 1, provides up to 15.4 W of DC power (minimum 44 V DC and 350 mA) [2] [3] on each port. [4] Only 12.95 W is guaranteed to be available at the powered device as some power dissipates in the cable.

4. Network switch - Wikipedia

   en.wikipedia.org/wiki/Network_switch

   A switch that also operates at these higher layers is known as a multilayer switch. Segmentation involves the use of a switch to split a larger collision domain into smaller ones in order to reduce collision probability and to improve overall network throughput. In the extreme case (i.e. micro-segmentation), each device is directly connected to ...