What is the working process of a POE switch?

POE (Power Over Ethernet) refers to some IP-based terminals (such as IP phones, wireless LAN access points APs, network cameras) without any changes to the existing Ethernet Cat.5 cabling infrastructure. Etc.) While transmitting data signals, it can also provide direct current technology for such devices. It is a switch that supports Power over Ethernet.

When deploying a POE switch in a network, the POE switch works as follows:

Detection: At the beginning, the poe switch outputs a very small voltage at the port until it detects that the cable terminal is connected to a power-receiving device that supports the IEEE 802.3af standard.

PD end device classification: After detecting the PD of the power end device, the POE switch may classify the PD device and evaluate the power loss required by the PD device.

Start of power supply: During a startup period of a configurable time (typically less than 15Î¼s), the poe switch starts to supply power from the low voltage to the PD device until a 48V DC power supply is provided.

Power supply: Provides a stable and reliable 48V DC power for the PD equipment, to meet the PD equipment does not exceed the 15.4W power consumption.

Power-off: If the PD device is disconnected from the network, the poe switch will quickly stop supplying power to the PD device (usually within 300 to 400 ms) and repeat the detection process to check whether the cable's terminal is connected to the PD device.

A complete POE system includes PSE (Power Sourcing Equipment) and PD (Power Device), and poe switch is a PSE device. The PSE device is a device that provides power for Ethernet client devices and is also the administrator of the entire PoE Power over Ethernet process. The PD device is a PSE load that receives power, that is, a client of a POE system.

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How to solve the harm of too dry indoor air

If the indoor air is too dry, it will make people feel very uncomfortable. It will not only affect skin health, but also have a certain impact on visceral health. Therefore, when you feel that the indoor air is dry, you must find a way to solve it in time. How to solve the indoor air drying?

If the indoor air is dry, you can put some plants. You should choose tiger tail orchid, aloe or Chlorophytum, which can release oxygen at night. Don't put too much in the bedroom. You can sprinkle some water on the leaves of plants. In order to solve the problem of indoor air drying, you can put a basin of water in the room, cover a wet towel on the radiator, or put a basin of water in the room, and you can also drag the floor with a mop to make the ground moist. In this way, you can solve the problem of too dry air, and this method is relatively healthy, There will be no harm. If the indoor air is too dry when using the humidifier, you can also use the humidifier Aroma Diffuser. This is a relatively simple method. You can put pure water or cool it in the humidifier. It should be replaced every day. It should be cleaned after about two weeks of use. Do not add essential oil or bactericide indiscriminately in the humidifier. After entering the body, On the contrary, it will have an adverse impact on health, which is easy to cause bronchitis and lung diseases. Indoor drying of wet clothes to solve the problem of air drying, you can dry wet clothes indoors, which can also increase the humidity. If some clothes are not in a hurry, don't dry or dry them directly. Put them indoors and let them dry naturally, so that the humidity in the house can be improved a lot.

Indoor air drying is harmful. There are many air drying bacteria, which are easy to have a great impact on the respiratory system. Moreover, the water loss in the body becomes faster, and the speed of skin aging will naturally become faster, so wrinkles will appear on the face.

What fruit do you eat when the air is dry

Hawthorn indoor air is dry, and the water loss rate in the body will be accelerated. To solve this problem, eating some Hawthorn appropriately can achieve very good results. It can improve appetite, help digestion, reduce blood lipids, activate blood vessels, supplement the water needed by the body and make the body metabolism faster. Apples are rich in nutrients, which can make the skin more lubricated. Eating more apples when the indoor air is dry can keep the skin moist. Banana indoor air is dry, you can eat some bananas appropriately, and it is rich in potassium, so it can maintain better skin health, effectively solve the skin problems caused by drying, and discharge the stool more quickly. The sour and sweet taste of grapefruit grapefruit is very good, and it can clean up the intestines and moisten the lungs. It can make the food digestion faster. The effect of relieving cough and resolving phlegm is very good, and it can also improve the appetite.

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