What is a PoE switch? Where is it usually used?

- Dec 10, 2020-

What is a PoE switch?

PoE switch (ie, Power over Ethernet switch) is a network switch that uses power over Ethernet technology. It can achieve efficient network connection and power transmission through network cables, and provide data signals for IP phones, IP cameras, wireless access points and other devices And direct current. Currently there are many types of PoE switches on the market, which can be divided into 8-port/16-port/24-port PoE switches according to the number of ports. According to whether the switch chip comes with a microprocessor, it is divided into a managed PoE switch and an unmanaged PoE switch.


Where is PoE usually used?

To understand where PoE switches are usually used, you must first understand what non-PoE switches are and the difference between PoE switches and non-PoE switches.

Non-PoE switches refer to switches that do not have the power over Ethernet function. Therefore, this series of switches cannot supply power to PoE powered devices through network cables, but can only transmit data for them.

If you want to provide DC power to PoE powered devices, you can deploy power supply equipment (PSE) such as PoE power injectors (power injectors) between the non-PoE switch and PoE powered devices. These power supply devices can combine the data signals of the non-PoE switches with Its own electric energy is combined to provide DC power while providing data signals for PoE powered devices. However, because the power supply equipment (PSE) itself also needs a power cord to provide power (sometimes it is necessary to add a separate socket), therefore, the number of wires and sockets required for this application program increase, resulting in an increase in construction and cost, and at the same time, for management and maintenance Caused inconvenience.

Compared with non-PoE switches, PoE switches simplify the connection. It only needs a single network cable to meet both data transmission and DC power supply (one end of the network cable is connected to the receiving end device, and the other end is connected to the RJ45 port of the PoE switch) , It effectively saves the use of basic power equipment such as power cords and power sockets, simplifies network deployment plans, makes construction more convenient, and manages and maintains more convenient.

In summary, compared to non-PoE switches, PoE switches can provide users with higher flexibility, simplicity, and higher cost-effectiveness.

Flexibility: There are no additional power supply equipment and extension cables, which simplifies network deployment, saves space, and brings great flexibility to network wiring. Users can plan IP phones, IP cameras and other power-receiving equipment according to actual application requirements Installation location. In addition, PoE switches can be integrated with wireless technology to achieve wireless local area networks, bringing greater flexibility.

Convenience: The PoE switch supports the transmission of data signals and direct current through a network cable. It is easy to install and can be moved at will. In addition, the PoE switch can monitor and manage the device through the Simple Network Management Protocol (SNMP).

Cost-effective: In fact, many power-receiving devices (such as video surveillance cameras, etc.) need to be installed in places where it is difficult to deploy AC power, and the use of PoE switches eliminates the need for users to purchase expensive power supplies, other cables, and sockets. Save installation time and cost to a large extent.


1. Can one PoE switch be connected to another PoE switch?

can. The PoE switch will only provide data transmission and direct current to the power receiving device (PD) when it is used as the power supply device (PSE) to detect the power receiving device (PD). The two PoE switches are both power-supply end devices. If they are connected, they can be used directly as ordinary switches. At this time, the two PoE switches only perform data transmission and will not supply power to each other.

two pieces of poe connection

2. What is the difference between a PoE switch and a PoE+ switch?

The difference between a PoE switch and a PoE+ switch is mainly that they provide different DC power for the receiving end equipment.

3. What is the difference between a managed PoE switch and an unmanaged PoE switch?

The managed PoE switch is a power over Ethernet switch that supports VLAN, SNMP, port mirroring, and other functions. It can effectively help users divide areas for different applications and effectively control and manage the network. However, because the unmanaged PoE switch has a fixed configuration pre-installed in advance, it can only allow communication between devices, and does not process data, nor can it make any changes to the configuration.

4.Can a computer or other non-PoE devices be connected to the PoE switch? If it is connected, will it be damaged?

If you want to connect to other devices, you need to choose a standard PoE switch instead of a non-standard PoE switch. This is because only standard PoE switches have the detection function, which can automatically detect devices that support the Power over Ethernet standard and supply power to them. If it detects that the connected device does not comply with the power over Ethernet standard (that is, it does not have the PoE function), it will perform data transmission like a normal switch, and will not supply power to it.

However, non-standard PoE switches are different. Regardless of whether the connected device complies with the Power over Ethernet standard (whether it supports the PoE function), it will provide a certain amount of direct current for it. If the connected device is not a PoE device, it will cause damage.

As far as the PoE switch products on the market are concerned, they are basically standard PoE switches. However, there are still some suppliers who provide non-standard PoE switches. Considering the safety and practicality, it is more safe to choose standard PoE switches.