Cable is essential to connect a LAN. The common network cable in LAN mainly has twisted pair, coaxial cable, optical cable three. Twisted pair is a data transmission line composed of many pairs of wires. It is cheap, so it is widely used, such as our common telephone lines. It is used to connect to the RJ45 crystal head.
The classification of network cables
The English name of Twisted Pair is Twisted Pair. It is the most commonly used transmission medium in the integrated wiring engineering.
Twisted pair USES a pair of mutually insulated metal conductors to resist electromagnetic interference with frequencies less than 25MHz. By stringing two insulated copper wires together at a certain density, the intensity of signal interference can be reduced. Hence the name "twisted pair".
The wire pair is generally made of a pair of 22-24 wire gauge insulated copper wire twisted, practical use, twisted pair is a pair of twisted pair together in an insulated cable sheath. There are typically four pairs of twisted pair and many more in a single cable sleeve. These are what we call twisted pair cables. In twisted pair cable (also called twisted pair cable), different cable pairs have different twisted lengths. Generally, the closer the twisted wire is, the stronger its anti-interference ability will be. Compared with other transmission media, twisted pair wire is limited in transmission distance, channel length and data transmission speed, but its price is relatively low.
Type 1 wire: used primarily for voice transmission (type 1 standard used primarily for telephone cables prior to the early 1980s), unlike data transmission, has been eliminated by the standard.
Second class: the transmission bandwidth of 1MHZ, for voice transmission and the highest transmission rate of 4Mbps data transmission, commonly used in the 4Mbps specification of the Token transfer protocol, the old Token Ring, has been eliminated by the standard.
Three types of cables: the transmission bandwidth of the cable is 16MHz, which is used for voice transmission and the data transmission with the highest transmission rate of 10Mbps is mainly used for 10BASE--T, which is regarded as the lowest usage level by ANSI/ tia-568.c.
Four kinds of lines: the transmission bandwidth of this kind of cable is 20MHz, which is used for voice transmission and the data transmission with the highest transmission rate of 16Mbps is mainly used for the local area network based on token and 10base-t / 100base-t, which has been eliminated by the standard.
Five kinds of lines: this kind of cable increases the winding density and the transmission bandwidth is 100MHz, which is used for voice transmission and data transmission with the highest transmission rate of 100Mbps. It is mainly used for 100base-t and 10base-t networks, and has been replaced by super five kinds of lines.
Super five lines: with small attenuation, less crosstalk, and more near end crosstalk power and test requirements than the five lines, and with higher attenuation crosstalk ratio (ACR) and signal to noise ratio, smaller delay error, the performance is greatly improved. The maximum bandwidth of super five lines is 100MHz.
Six types of cables: the transmission bandwidth of this kind of cable is 250MHz, and the comprehensive attenuation crosstalk ratio (ps-acr) of the six types of cabling system should have a large allowance at 200MHz, which provides twice the bandwidth of super five types. The transmission performance of six cabling is much higher than that of super five cabling, which is most suitable for the application of transmission rate of 1Gbps. An important difference between the six and super five classes is that they improve performance in crosstalk and return loss, which is essential for the new generation of full-duplex high-speed network applications.
Super6 cable: super6 cable is an improved version of super6 cable, released in 2008. It is also a twisted pair cable stipulated in ANSI/ tia-568c.2 and ISO/IEC 11801 super6 /EA standard. It is mainly used in gigabit networks. The transmission frequency is 500 MHz, and the maximum transmission speed can also reach 10Gbps, which has a great improvement in external crosstalk and other aspects.
Seven types of wire: this wire is a twisted pair of wire approved by ISO/IEC 11801 class 7 /F standard in 2002, mainly for the application and development of gigabit Ethernet technology. But it is no longer an unshielded twisted pair, but a shielded twisted pair, so it can transmit at least 600 MHz at a rate of 10 Gbps.
And the twisted pair wire that buys can be done in businessman there commonly twisted pair wire and RJ45 joint, take back use become. If you are free, you can make your own, but you need to buy a pair of pliers.
To see so many model of network cables, have the time at home an Internet cable for my own hands, if you have a network cable, fiber optic cable, RJ45 crystal top requirements, please contact us.