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To see how many cameras can be powered simultaneously by a PoE switch, consider two aspects: the power of the PoE switch and the total power of the PoE switch.
The power supply of a PoE switch can be understood as the single-port power supply of a PoE switch.
There are two standards for PoE switches on the ONV optical network, IEEE802.3af and IEEE802.3at.
The IEEE802.3af standard defines a power supply of 15.4 W. The IEEE802.3at standard defines a power supply of up to 30 W. The single-port power supply varies according to the power supply standard. For example, the camera power is 9W, and the standard aE standard PoE switch can be used; if the camera power is 20W, the standard PoE switch needs to be used; if the camera power is more than 30W, it needs to use a dedicated PoE power supply module to supply power.
The total power of a PoE switch is a very important indicator that directly relates to how many cameras you can bring.
Taking the ONV-PoE31024PF switch of Optical Network as an example, the power supply power is 400 W, and the total power of the lossy PoE switch is 370 W. Under the IEEE802.3af standard, it can supply 24 ports (370/15.4=24), that is, it can supply power to 24 cameras at the same time; but if it is calculated according to the IEEE802.3at standard single-port maximum power supply of 30W, at most Only 12 ports can be powered (370/30=12).
However, in actual use, the maximum power consumption of many common webcams is relatively low, and the maximum power consumption is basically no more than 15W. If each PoE port then reserves power according to the maximum power, then some ports will not use PoE power. However, some ports do not share power. The PoE switches in optical networks support dynamic power allocation to avoid this situation. Therefore, when selecting a PoE switch, it depends on whether the switch supports dynamic power allocation, so that each port only allocates the power actually used, so that the power of the PoE switch can be used more efficiently.
to sum up:
1. Use a switch that supports dynamic power distribution to maximize power efficiency;
2. First understand the maximum power consumption of the powered device, and then divide the total power supply power of the PoE switch by the maximum power consumption to determine how many devices a PoE switch can supply.
How many cameras can power a PoE switch at the same time?
With the development of technology, many cameras currently used support PoE power supply. In the network monitoring construction, in order to reduce the cost of wiring and more convenient and rapid, most of the engineering companies will consider adopting PoE power supply. However, the first-time contact with PoE power supply may not know much about PoE switches, nor do they know how to choose, nor how much power a PoE switch can give to a camera.