Still, as well as running images can be captured and communicated to nearby fog nodes as well as to faraway cloud nodes in order to readily process the photos and compare them with the face images of radicals, extremists, fundamentalists, terrorists, arsonists, trouble-makers, etc., in the already stored databases. Further on, nowadays smartphones are embedded with powerful cameras to click selfies as well as produce photos of others. Security and surveillance cameras are being fitted in different important junctions such as airports, nuclear installations, government offices, retail stores, etc. See “Troubleshooting Camera Power” later in this chapter for more information. Commercial power supply manufacturers such as Altronix and Cantek provide fused multichannel and even multivoltage power distribution solutions designed for video surveillance products. Whatever the power specifications, remember that without power the camera can’t perform, so don’t skimp on the power supply or else plan on replacing it in a few years. Select IP cameras can be powered by 24 volts or PoE others just provide an option of 24 VAC or 12 VDC. Many cameras also provide an option of more than one type of power. A 24 VDC power supply or adapter will not power a 24 VAC requirement, and vice versa, unless the camera specifications determine that the power board inside the camera is capable of distinguishing between the two currents. It is important to accurately distinguish which type of low voltage the camera uses, because 24 volts DC (VDC) is different from 24 volts AC (VAC).
Most economical security cameras use inexpensive 12 VDC power adapters, or 24 VAC, which require an 110v power receptacle or power converter, whereas midrange cameras need 24 VAC volts.
This is based solely on the camera specifications. Security cameras are typically powered by low voltage, from 12 volts up to about 50 volts using Power over Ethernet (PoE). Caputo, in Digital Video Surveillance and Security (Second Edition), 2014 Power Requirements
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