What are the main functions and advantages of PoE power supply? Are PoE switches any good?

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Detection: At first, the PoE switch outputs a small voltage on the port until it detects that the cable termination is connected to a standard-supporting powered end device.

PD Device Classification: When a PD is detected on the power receiver device, the PoE switch may classify the PD device and evaluate the power loss required by the PD device.

Start power: During a boot period with a configurable time (typically less than 15 seconds), the PoE switch starts supplying power to the PD device from a low voltage until it provides 48V DC power.

Power supply: Provide stable and reliable 48V DC power for PD equipment to meet the power consumption of PD equipment.

Power outage: If a PD device is disconnected from the network, the PoE switch will quickly (within 300 to 400 ms) stop powering the PD device and repeat the detection process to detect whether the endpoint of the cable is connected to the PD device.

The PoE power switch itself uses redundant pairs to supply power to each other, and if your digital monitoring device also supports PoE power supply, you only need to connect the twisted pair to the devices at both ends.

The surveillance camera or AP supports PoE power supply, and the switch also supports PoE power supply. Just use a network cable and you're good to go. Data and power are transmitted using network cables.

A PoE power supply switch is a PoE switch that adds a PoE power supply module or PoE power supply circuit to the traditional switch so that the network port can output power.

Power supply distance of the PoE switch:

Theoretically, the maximum impedance of a normal 100-meter network cable is 20 ohms, and the voltage drop is 7V under the condition of 350mA power supply, the loss of the network cable is watts, and the maximum power available at the receiving terminal is watts. When the power consumption of the receiving terminal is not large, the PoE transmission distance can reach 100 meters. However, if you use a network cable with poor quality or a non-copper cable, the line loss will be increased and the PoE transmission distance will be affected.

The PoE switch can supply power to ordinary routers, because the router port itself does not provide power**, all need to add an additional PoE power supply module, and the connection method is as follows:

1. The LAN port of the router is connected to the LAN port of the POE power supply module with a network cable;

2. Then the PoE port of the power supply module is connected with the PoE port of the switch with a twisted pair;

3. The power supply module itself needs to be connected to the power supply.

Note: For POE power supply, the twisted pair must be made of high-quality 8-core copper core wire, according to the standard T568A or T568B connection.

Features of PoE:

1. The construction is simple.

2. A network solves the problem of power and network transmission.

3. POE is a weak current, and the electrical safety level is high.

4. The overall maintenance cost is low.

Non-PoE features.

1. The overall construction cost is low.

2. Connect to the mains, and the safety of electricity is dangerous.

3. The on-site construction is complex.

Comparison chart between non-PoE and PoE monitoring connections.

PoE power supply benefits.

Poe power supply is to add power to the network cable to transmit to the powered equipment, and network monitoring is also the use of network cable to transmit the best signal, so the same network cable transmits power and data signals, which greatly saves costs and is very convenient. Even if the camera and the PoE power supply switch are separated by 50 meters, they can get a steady stream of power** to complete their monitoring duties.

Disadvantages of POE power supply.

If the distance of the webcam that needs to be powered is too far, it is better to exceed 100 meters or even reach thousands of meters, it is not suitable for PoE power supply, and other methods need to be used. In addition, the maximum power of PoE power supply does not exceed 30W, and if the power of the webcam exceeds 30W, PoE power supply cannot be used.

The transmission distance of PoE is generally the same as that of the network, but in some standards, such as the Shanghai security standard, it is recommended to transmit 75 meters. The maximum effective transmission distance is 100 meters.

Benefits of using a PoE power supply module:

1. It is easy to install and manage. Customers can automatically and securely mix legacy and PoE devices on the network, coexisting with existing Ethernet cables.

2. It is easy to manage network devices.

3. It's safe. This is because the PoE power supply device will only supply power to the equipment that needs to be powered. Voltage is only present in the Ethernet cable when the device that needs to be powered is connected, eliminating the risk of leakage on the line.

4. It saves costs. Because it only needs to install one cable instead of two. In many cases, it needs to be installed in places where it is difficult to deploy AC power.

As the number of Ethernet-connected devices increases, eliminating the need for local power supply to the devices will greatly reduce deployment costs and simplify their manageability.

PoE switches have the following differences:

1.Reliability is different:

Compared with ordinary switches, PoE switches are switches that support power supply to network cables, and compared with ordinary switches, powered terminals (such as APs and digital cameras) do not need to be wired for power supply, which is more reliable for the entire network.

2.The features are different:

In addition to providing the transmission function of ordinary switches, the PoE switch can also provide power supply to the equipment at the other end of the network cable.

3.The advantages are different:

PoE switches have many advantages, no need to pull wires, but also save costs, the system is more flexible, and the later upgrade and maintenance are simple.

4.The power supply method is different:

A PoE switch is a switch that supports power supply over network cables, which can not only realize the data transmission function of ordinary switches, but also supply power to network terminals at the same time. Normal switches need power to function properly, and PoE solves this perfectly.

5.The controls are different:

The difference between PoE switches and ordinary switches is that some PoE switches with good performance can also easily manage the power supply of each PoE port and the entire device through a user-friendly operation interface, which is more convenient to control.

Yes, but only one switch has the PoE function, and the PoE function of the other switches must be disabled.

If the PoE function is enabled, the switches become mutually loaded, and their operation is unstable.

Of course.

PoE switches are the same as ordinary switches, but they have more PoE power supply functions.