Working Principles of PoE Switch

Step 1: Detect the receiving device (PD). It is mainly to detect whether the connected device is a real receiving device (PD) (in fact, it is to detect the receiving device that can support the Power over Ethernet standard). The PoE switch will output a small voltage at the port to detect the receiving end device, that is, the so-called voltage pulse detection. If the effective resistance of the specified value is detected, the device connected to the port is the true receiving end device. It should be noted that the PoE switch is a standard PoE switch, and the non-standard PoE switch does not perform this detection without the control chip. To learn more about the standard PoE switch and the non-standard PoE switch, visit the “What is the difference between the Standard PoE switch and the Non-standard PoE Switch? How to choose between the two?”.

Step 2: the receiving device (PD) classification. When the receiving end device (PD) is detected, the PoE switch classifies it, grades it, and evaluates the power consumption required by the receiving end device.

Step 3: Start the power supply. After confirming the class, the PoE switch will power the receiving device from low voltage to 48V DC in less than 15μs configuration time

Step 4: Normal power supply. It mainly provides stable and reliable 48V DC power for the receiving equipment to meet the power consumption of the receiving equipment.

Step 5: Disconnect the power supply. When the receiving end device is disconnected, power overload, short circuit, or power consumption exceeds the power budget of the PoE switch, the PoE switch stops supplying power to the receiving end device within 300 to 400ms and checks the power again. The device and PoE switch can be protected to prevent device damage.

The working principle of PoE switch is roughly introduced in the above content, about the switch series products mentioned above in Shenzhen HDV Phoelectron Technology Ltd. belongs to the popular class of communication products, such as: Ethernet switch, Fibre Channel switch, Ethernet Fibre Channel switch, etc., the above switches can be used in a variety of scenarios, to provide more choices for users with different needs, welcome to come to understand, we will provide the best quality service. The following is a typical POE receiving switch of our company.