Nowadays, small appliances such as USB fans, refrigerators, hand warmers, electric shoes, humidifiers and other small appliances can be seen everywhere on the store and on the street. Prices range from tens to hundreds of yuan. However, these products are simple in packaging, and most of them do not have basic information such as manufacturer and date of shipment, and there is no “3C†certification mark.
When it's cold and dry, everyone will buy a warm handbag or humidifier with a USB port, connect to the USB port of the computer, and you can open the humidifier or warm the handbag. However, the voltage and current value of the computer's USB interface is not stable, and it will change with the use of the computer. Because the voltage and current are unstable, it is very easy to burn the computer's USB interface during the operation and connection with the computer. Or even damage the computer motherboard.
USB small appliances are products that have only emerged in recent years. Their positioning is rather vague. Therefore, they have not attracted the attention of relevant departments and there are no industry standards and specifications. When purchasing these products, consult, compare, and understand more.
Fiber patch cords are used to make patch cords from the device to the fiber optic cabling link. There is a thick protective layer, which is generally used in the connection between the optical transceiver and the terminal box, and is applied in some fields such as a fiber-optic communication system, a fiber access network, an optical fiber data transmission, and a local area network.
Optical fiber jumpers (also known as fiber optic connectors) are connectors that are attached to both ends of the cable.
It is used to realize the optical path active connection; the plug at one end is called the pigtail. Optical Fiber Patch Cord/Cable is similar to Coaxial Cable except that there is no mesh shield. The center is the glass core of light transmission. In a multimode fiber, the core has a diameter of 50 μm to 65 μm, which is roughly equivalent to the thickness of a human hair. The single mode fiber core has a diameter of 8 μm to 10 μm. The outer periphery of the core is surrounded by a glass envelope having a lower index of refraction than the core to retain the fiber within the core. Next to it is a thin plastic jacket to protect the envelope.
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Jiangsu QiSheng Cable Co., Ltd. , https://www.shuaihe-cable.com