what is ethernet cable?

The "Network Cable" in the Internet has a metal isolation film inside the twisted pair of STP, which can reduce electromagnetic interference during data transmission, so its stability is high. But there is no such metal film in UTP, so its stability is poor, but its advantage is that it is cheap. The price of UTP twisted-pair cable is generally about 1 meter and 1 yuan, while STP twisted-pair cable may be cheaper, a few yuan 1 meter, and the more expensive one may be more than ten yuan for 1 meter. The purchased twisted-pair cable can generally be done at the merchant’s place and the twisted-pair cable and RJ45 connector can be used.If you are free, you can also make your own, but you need to buy a pliers. There are a total of eight twisted-pair wires. The wiring rule for eight wires is that 1236 wires are useful and 4578 wires are idle. ++Coaxial++ cable is a cable with a central copper conductor wrapped in layers of insulated wires. It is characterized by good anti-interference ability, stable data transmission, and low price. It is also widely used, such as closed-circuit television lines. Coaxial thin cables are generally sold at a few yuan per meter in the market, which is not too expensive. The coaxial cable is used to connect with the BNC connector. The coaxial cable sold on the market is generally a finished product that has been connected with the BNC connector. You can directly choose the optical cable. It is the most advanced network cable at present, but its price is more expensive. , Rarely used in household occasions. It is composed of many hair-thin glass fibers plus an insulating sleeve.Because it relies on light wave transmission, its characteristics are excellent anti-electromagnetic interference, strong confidentiality, high speed, large transmission capacity, etc.++ The English name of the twisted pair is Twist-Pair. It is a commonly used transmission medium in integrated wiring engineering. Twisted pair wire uses a pair of mutually insulated metal wires twisted with each other to resist a part of external electromagnetic interference. Twisting two insulated copper wires with each other at a certain density can reduce the degree of signal interference. The radio waves radiated by each wire during transmission will be cancelled by the radio waves emitted by the other wire. The name "twisted pair" also comes from this.

The finished network cable, the twisted pair wire is generally formed by two 22-28 insulated copper wires twisted with each other. In actual use, the twisted pair wire is wrapped in an insulated cable sleeve by multiple pairs of twisted pairs. There are typically four pairs of twisted-pair wires, and there are more pairs of twisted-pair wires placed in a cable sleeve. This is what we call twisted pair cable. In a twisted pair cable (also called a twisted pair cable), different pairs have different twist lengths. Generally speaking, the twist length is within 38.1cm to 14cm, which is twisted in a counterclockwise direction. The twisted length of the adjacent wire pair is above 12.7cm. Generally, the denser the twisted wire, the stronger the anti-interference ability. Compared with other transmission media, the twisted pair has the same transmission distance, channel width and data transmission speed. Subject to certain restrictions, but the price is relatively low.