What are the hidden indicators of POE switches?

A very important hidden indicator of POE switches is the total power supplied by POE. Under the IEEE802.3af standard, if the total POE power supply of a 24-port POE switch reaches 370W, then it can supply 24 ports (370/15.4=24), but if it is a single port according to the IEEE802.3at standard, the maximum power The power supply is calculated at 30W, and it can only supply power to 12 ports at most at the same time (370/30=12).

However, in actual use, the maximum power consumption of many low-power devices is relatively low. For example, the power of single-frequency APs is 6~8W. If each POE port reserves the power supply according to the maximum power at this time, it will appear The POE power of some ports cannot be used up, while the power of some ports cannot be allocated. Many POE switches support Dynamic Power Allocation (DPA). In this way, each port only allocates the power actually used, so that the power supplied by the POE switch can be utilized more efficiently.

Let’s make an assumption, if we use the 24-port POE switch  JHA-P420024BTH and the single-band panel type JHA-MB2150X. We assume that the POE power of the JHA-P420024BTH is 185W (Note: the power of the 24-port POE switch  JHA-P420024BTH is 380W). 12 ports are powered, and after dynamic power distribution is adopted, because the maximum power consumption of JHA-MB2150X is 7W,  JHA-P420024BTH can power 24 panels of JHA-MB2150X (185/7=26.4).


Post time: Mar-14-2022