Today, your old friend Guangzhou DSPPA Audio Co., Ltd. will explain to you the working process of POE switch.
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When arranging POE switches in a network, the POE switches work as follows:
Detection: At the beginning, the poe switch outputs a small voltage at the port, until it detects that the connection of the cable terminal is a power receiving device that supports the IEEE802.3af standard.
PD device classification: After detecting the PD of the power receiving device, the poe switch may classify the PD device and evaluate the power consumption required by the PD device.
Start power supply: During the start-up period of a configurable time (generally less than 15μs), the poe switch starts to supply power to the PD device from a low voltage until a 48V DC power supply is provided.
Power supply: Provide stable and reliable 48V DC power for PD devices to meet the power consumption of PD devices that do not exceed 15.4W.
Power failure: If the PD device is disconnected from the network, the poe switch will quickly (usually within 300-400ms) stop supplying power to the PD device, and repeat the detection process to detect whether the terminal of the cable is connected to the PD device.
A complete POE system includes two parts: power supply equipment (PSE, Power Sourcing Equipment) and power receiving equipment (PD, Power Device). The poe switch is a kind of PSE equipment. The PSE device is the device that supplies power to the Ethernet client devices and is also the manager of the entire POE power over Ethernet process. The PD device is the PSE load that receives the power supply, that is, the client of the POE system.