Monitor screen card? Because the wrong PoE switch

Many friends who claim to be a security “holy hand” have found it to be unwieldy when they use PoE power supply and surveillance cameras to power the camera. What's the matter? PoE switch problem? It is not also. It is indeed a PoE switch problem, but it is not the quality of the PoE switch itself, but it is likely that you are using the wrong one.

First of all, we must know the role of PoE switches, one is data transmission, and the other is PoE power supply. For monitoring, these two functions must all be met to ensure good monitoring results. If the bandwidth of the selected PoE switch is too small, the monitor screen card will appear. If the power supply of the complete machine is insufficient, the camera cannot work normally.

So make sure you choose the right PoE switch and look at three points: backplane bandwidth, power supply standards, and overall power.

1. how much backplane bandwidth <br> <br> PoE switch backplane bandwidth, power need to be determined and the number of cameras. Generally, the simplest 4-port PoE switch has 1Gbps of backplane bandwidth. In addition, the video stream is not fixed and may be very large at a certain time. Therefore, the buffer of the PoE switch must also be sufficient.

2. Power Supply Standards PoE power supply standards have af and at standards. The former has less power than the latter, and the latter is compatible with the former. Xiao Bian believes that when choosing a PoE switch, try to choose to support both af and at standard.

3. Total Power <br> <br> Total power PoE switch can determine the number of devices simultaneously to the power supply, such as rich, up to 16 ports of PoE power PoE switch PS3016, support af / at standard, machine power is 250 If the power of the surveillance camera is 12W, then it is no problem to supply 16 cameras with full load at the same time. However, if the power of the camera is 20W, only 12 cameras can be powered.

The same type of PS1016, all indicators the same with the PS3016, the only difference is that the power of the entire machine is 400W, so as long as the camera's power is less than 25W, you can fully load the power supply.

Note: Since PoE switches are generally at the access layer of the entire monitoring system, they simply select PoE switches from the access layer. If the PoE switches are involved in the aggregation layer and the core layer, they are more complicated.

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