Classification of network cables: 1. Category 5 cable, used for voice transmission and data transmission with a maximum transmission rate of 100Mbps; 2. Category 5e cable, with a maximum bandwidth of 100MHz, mainly used for Gigabit Ethernet. It has the characteristics of small attenuation and less crosstalk; 3. Category 6 cable, also known as "Gigabit network cable", is mainly used in Gigabit networks; 4. Category 6 super cable, with a transmission frequency of 500MHz, is mainly used in 10 Gigabit networks ; 5. Category 7 cable is a shielded twisted pair, mainly used in 10 Gigabit network, with a transmission rate of up to 10Gbps.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
Network cables are cables that connect computers to computers, and computers to other network devices. Network cables are generally made of metal or glass and are used to transmit information within a network.
Classification of network cables:
1. Category 5 cable
The transmission bandwidth is 100MHz, used for voice transmission and data with a maximum transmission rate of 100Mbps Transmission, mainly used in 100BASE-T and 10BASE-T networks, has been replaced by Category 5e cables.
2. Category 5e lines
have small attenuation and less crosstalk. The maximum bandwidth of Category 5e lines is 100MHz. Mainly used for Gigabit Ethernet.
3. Category 6 cable
The transmission bandwidth of this type of cable is 250MHz. The transmission performance of Category 6 wiring is much higher than the Category 5e standard. It is most suitable for applications with a transmission rate of 1Gbps. .
Supports Gigabit networks, often referred to as "Gigabit network cables"; Category 6 cables provide a comprehensive attenuation to crosstalk ratio of 200MHz and an overall bandwidth of 250MHz; Category 6 cables are mainly used in Gigabit networks, The transmission performance is much higher than the standard of Category 5e network cable.
4. Category 6e cable
The Category 6e cable is an improved version of Category 6 cable and is mainly used in 10 Gigabit networks. The transmission frequency is 500MHz, and the maximum transmission speed can also reach 10Gbps.
Compared with Category 6 lines, it has been greatly improved in crosstalk, attenuation, signal-to-noise ratio, etc.
5. Category 7 line
It is mainly designed to adapt to the application and development of 10 Gigabit Ethernet technology. But it is no longer an unshielded twisted pair, but a shielded twisted pair, so its transmission frequency can reach at least 600MHz and the transmission rate can reach 10Gbps.
Category 7 cable is a shielded twisted pair, mainly used in 10 Gigabit network, with a transmission rate of up to 10Gbps; in Category 7 cable, each pair has a shielding layer, and the four pairs of cables are combined There is also a common shielding layer, which looks much thicker than common network cables.
Quality Identification
There are more fake twisted pairs on the market now than real ones, and there are also fake twisted pairs on the fake lines. The same markings as the real line. In addition to fake wires, there are many cases in the market where Category 3 wires are used to impersonate Category 5 wires and Category 5e wires. The following is the identification method of network cables:
1. The cables in Category 3 cables are two to four, and the cables in Category 5 are four to eight.
2. The outer rubber of real thread is not easy to burn, while most of the outer rubber of false thread is flammable.
3. The outer rubber of the fake thread will become soft at higher temperatures (above 40℃), but it really won’t.
4. The copper core material inside the real wire is relatively pure, soft, tough and not easy to be broken.
5. The twisting direction of the network cable is counterclockwise instead of clockwise. Clockwise winding will have an impact on speed and transmission distance.
6. The number of turns when the wires in the network cable are wound in pairs is different, because if the number of turns is the same, the transmission signals between the two pairs of wires will interfere with each other, shortening the transmission distance.
7. There is a layer of metal mesh and insulation material between the conductors and the rubber of the shielded twisted pair, and the outside of the crystal head is also wrapped in metal.
8. If possible, you can find a 100-meter twisted pair and use the "Network Monitor" in Windows to test it on the spot. Category 5 lines can reach 100Mbps, while category 3 lines can only reach 10Mbps.
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