@mtjandra Ref : https://www.vision-systems.com/cameras-accessories/article/16745306/gearing-up-for-power-over-ethernet
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>“Ethernet cabling contains four pairs (eight wires),” says Dietmar Scharf of Baumer Optronic (Radeberg, Germany; www.baumergroup.com), “and because 100base-TX implementations use two pairs of them, it is possible to use the other (spare) wires for supplying power over the Ethernet cable. This is Mode B. “However, Gigabit transmission (1000base-T) uses all four pairs and so there are no spare wires.” Thus, power must be transmitted over the data lines (Mode A). In this configuration, two pairs are only for data transmission, and two pairs are shared for data and power in a so called phantom circuit” (see Fig. 1).
This is the method used by Baumer in its latest TXG series of 13 GigE cameras shown at VISION 2007 in Stuttgart, Germany (see Fig. 2). Because two GigE pairs are shared for data and power, designing PoE-based cameras requires minimizing any signal degradation of the data signal so that low-noise images can be accurately reproduced. Interestingly, even in the company’s fastest camera, the TXG03c, 90-frame/s, 656 × 494-pixel CCD color camera, the power requirement is approximately 4 W, well below the maximum 13 W specified by the PoE standard. The challenge of incorporating power into GigE-based cameras has so far limited the number of companies that offer such products, although many low-cost PoE cameras are currently available that target the less-stringent security market.
The way I understand it ; it seems difficult to realize POE with these type of camera's
M.
-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '
