1, Category 5 cables: There are some Category 5 cables in the market. Generally, the words "CAT.5" are marked on the sheath of Category 5 cables, which is relatively easy to identify.

2. Super Category 5 network cable: The sheath of Super Category 5 network cable is marked with the words "CAT.5e".

3. Category VI network cable: The sheath of Category VI network cable is marked with the words "CAT.6".

4. Super Category 6 cables: The sheath of Super Category 6 cables is marked with the words "CAT.6A", which is commonly known as 6A cables, and most of them have a "cross skeleton".

5. Seven types of wires: Among the seven types of wires, each pair has a shielding layer, and four pairs of wires together have a common shielding layer, which is much thicker than the common network cable in appearance.

Network cable is essential for connecting local area network. There are three kinds of common network cables in LAN: twisted pair, coaxial cable and optical cable. Twisted pair is a data transmission line composed of many pairs of wires. It is characterized by its low price, so it is widely used, such as our common telephone line. It is used to connect RJ45 crystal head. It is divided into STP and UTP, and UTP is usually used. Twisted-pair cables are terminated with two standards: T568A and T568B, and there are two main connection modes of twisted-pair cables: straight cables and cross cables. The two ends of the crystal head of the straight-through cable follow T568B standard, and each group of wires of twisted pair has one-to-one correspondence at both ends, and the same color is consistent in the slots corresponding to the crystal heads at both ends. It is mainly used to connect the uplink port of the switch (or hub) to the public port of the switch (or hub), or to connect the public port of the switch to the computer network card.