How Does a PoE-less Switch Implement POE Power Supply?

A friend asked whether the switch has no POE function. Can an extra POE power module be added to power the ap via the switch?

The answer is yes, it can only be calculated using the unused 4578 feet of the network cable in the 100M network environment to transmit power. That is, a POE combiner (also called a POE power supply) is bridged between the switch and the AP, but it depends on whether your AP supports POE power supply.

If you are a ceiling wireless AP, most of them are supported. One is the network cable from the network plug-in combiner, and the other is a network cable end and a DC plug, respectively plugged into the network port and power port of the AP. . However, there are also two ways to use POE to supply power to the AP in this case, but another 48V to 12V POE separator must be added on the AP side. This kind of POE separator is actually a DC48V to 12V transformer. One end is a network cable plugged into the POE cable, and the other is a cable end and a DC power plug, respectively, plugged into the AP's network port and power port.

The second method

1, the other end is a network cable head, inserted in the network wall plug to the AP, and the first method is similar, if the manual does not write to support POE, it is generally not supported, because it is necessary to increase this part of the circuit Ten dollar cost.

Plug in the network cable from the switch and the 12V power adapter in the AP, but there is no transformer section. The DATA connection to the AP is OK. If yes, a 48V POE power module can be connected across the switch and the AP. There are two network ports on the POE power module and the DATA connection switch is written.

DATA port plug in the switch over the cable, DATA & POWER port plug to the AP's network cable. Then the network cable at the AP end is connected with a POE splitter or splitter, which is also supported. However, the power supply is stable and the network cable length is allowed to reach 100 meters or more.

This method has the lowest cost, but if the network cable quality is too bad or too long, the AP power supply will be insufficient.

to sum up

The first method is costly, provided the AP supports poe power supply. If you do not support it, you can't use this connection method, otherwise it would be better if you have a power detection device that is automatically powered by a POE module. This is the simplest type of combiner on the market. Network port and a DC female. Whether to support the specification will be written (or ask the business), such as writing support for IEEE 802.

This type of combiner has a DC female connector plugged into the power adapter of the AP and is only suitable for a 100 megabit network environment. If this is done in a Gigabit network, the device will be connected. This approach is not part of the standard POE. If you do not insert through the wall, you should buy that kind of modular combiner. Some manufacturers will also be lazy writing support POE power supply. 3af or IEEE 802.3at, it is supported.