Network Cable: A medium used to carry information from one Network device (such as a computer) to another. It is the basic building block of a Network. In our common local area network, the use of network cable is also a variety of types, there are cat5e network cable, cat6 network cable, cat7 network cable and cat8 network cable. In general, a typical LAN does not use many different kinds of cables to connect network devices. In a large network or wide area network, different types of cable are used to connect different types of networks together. In many kinds of network cable, the specific network cable should be selected according to the network structure, network structure standard and transmission speed.
The cable produced by the network cable manufacturer is Twisted Pair, which can be divided into two types: Shelded Twisted Pair (STP/SSTP/SFTP) and Unshelded Twisted Pair (UTP). The so-called shielding refers to the outside of the signal line inside the network cable is wrapped in a layer of metal mesh or aluminum foil, outside the shielding layer is the insulation skin, the shielding layer can effectively isolate the interference of external electromagnetic signals.
UTP is a kind of network cable that can be used with high frequency in local area network. The wire is wrapped in a plastic insulated sheath with eight signal wires, two of which are wound together to form a total of four pairs, hence the name twisted-pair.
So the transmission speed test of network cable is an effective means to identify the quality of network cable. In order to be closer to the actual use environment and reduce external interference, the author suggests using the method of double machine direct connection. At the same time, in order to ensure the accuracy of the test, try to use good quality brand network card, to ensure that the test will not occur hardware bottleneck phenomenon; At the same time, it is also necessary to ensure that the computer system is clean, tidy and fast, otherwise the running speed of the computer itself will affect the transmission speed of the network cable. In addition, when connecting the network cable, try to use good quality crystal head, also want to ensure that the line head is done standard, only in this way can the influence of external factors on the transmission speed of the network cable be reduced to a relatively small degree.
Network wire material is aluminum and oxygen - free copper. Super Class 5 Unshielded Twisted Pair is a kind of cable after some performance improvements of the existing five types of shielded Twisted Pair. Many performance parameters, such as near-end crosstalk, attenuation crosstalk ratio, return loss, etc., have been improved, but its transmission bandwidth is still 100MHz. Super Class 5 unshielded twisted pair wires can also provide transmission bandwidth of up to 1,000 Mb/s, but often require the support of expensive special equipment. Therefore, it is usually only used for 100Mb/s Fast Ethernet to connect the desktop switch to the computer. If you are not going to upgrade your network to Gigabit Ethernet at a later date, you might as well use Class 5 Twisted-Pair in horizontal wiring.
