PoE switch refers to a switch that can provide network power supply to remote powered terminals through a network cable. It is a relatively common power supply device in PoE power supply systems. However, if a switch does not have a POE function, can an additional poe power supply module be added to power the AP through the switch? In fact, it is possible. It can only be regarded as using the idle 4578 feet of the network cable in the 100M network environment to transmit power. That is to connect a POE combiner (also known as a POE power supply) between the switch and the AP, but the premise depends on whether your AP supports receiving POE power supply.

PoE switch power supply mode one

So if you have a ceiling-mounted wireless AP, most of them support it. One end is the network cable from the network port, and the other end is a network cable and a DC plug, which are plugged into the AP’s network port and power port. That’s it. However, in this case, there are two ways to use POE to supply power to the AP, but an additional 48V to 12V POE splitter is added to the AP.

This kind of POE splitter is actually a DC48V to 12V transformer. One end is a network cable from the network port to plug in the POE, and the other end is a network cable head and a DC power plug, which are plugged into the AP’s network port and power port.

PoE switch power supply mode two

The other end is a network cable plug, which is inserted into the network wall plug leading to the AP. It is similar to the one in the first method. If the manual does not write to support POE, it is generally not supported, because adding this part of the circuit requires tens of yuan. Cost. Plug in the network cable from the switch and the 12V power adapter in your AP, but there is no transformer part; the DATA connection can be connected to the AP. If it is supported, a 48V POE power supply module can be connected between the switch and the AP. There are two network ports on the POE power supply module, and the switch connected to DATA is written. The DATA port is plugged into the network cable from the switch, and the DATA&POWER port is plugged into the network cable leading to the AP. Then the network cable at the AP end is connected to a POE splitter or splitter, which is also supported, but the power supply is stable and the length of the network cable is allowed to reach 100 meters or more. This method has the lowest cost, but if the quality of the network cable is too poor or too long, it will cause insufficient power supply for the AP.

Tips for POE switches

The first method is costly and requires the AP to support Poe power supply. If you don’t support it, you can’t use this connection method. Otherwise, it’s okay if it is equipped with automatic detection of the power receiving device. If the POE module is forced to supply power, it will burn the AP. Generally, the simplest combiner on the market is the one with one end. One network port and one DC female connector. Whether it supports the manual will be written (or ask the merchant), for example, it is written that it supports IEEE 802.

The DC female port on the combiner is plugged into the power adapter of the AP, and it is only suitable for a 100M network environment. If it is connected in a Gigabit network, it will burn the device. This method does not belong to the scope of standard POE. If you don’t plug it through the wall, you have to buy that kind of modular combiner. Some manufacturers will be lazy and just write that they support POE power supply. 3af or IEEE 802.3at, which means they support it.