Power over Ethernet technology is no longer new, it has been widely used in many network applications, including the popular network video surveillance system. Utilizing PoE technology is quite simple, you just need to choose the right switch which complies IEEE standard for PoE.
IEEE standard for PoE includes IEEE802.3af and IEEE802.3at. IEEE 802.3af-2003 PoE standard provides up to 15.4 W of DC power (minimum 44 V DC and 350 mA) to each device. Only 12.95 W is assured to be available at the powered device as some power is dissipated in the cable. IEEE 802.3at-2009 PoE, also known as PoE+ or PoE Plus, is a new standard, provides up to 25.5 W of power.
To know details about the PoE standard, you can read my previously published articles:
Today, you can have many several different PoE sources to provide Power over Ethernet, these choices including PoE injector, PoE mid-span, PoE switches. According to the white paper from Vicon Security, each of these PoE sources has cons and pros.
This is the quite old method, where the standard network is fed into an injector that adds (or injects) power to the cable and then continues to connect to the camera.
An expansion of the PoE injector concept, where multiple devices can be connected and get PoE added onto their network connections from a single appliance.
This is the most common appliance today and combines both the network side and the power, delivering them directly to the cameras.
Remark: the images originally deprive from the white paper published by Vicon Security.
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