Among the many network devices, network cable is another unusual gadgets, but a. .Usually you may be concerned about the cat, routing, switches and even how the quality of the network card, and for "a dollar a meter, give away crystal head, buy a computer would send" a network cable not care about a lot of friends. .However, the cable network's most critical information in a medium position, if it's low quality, we buy even the best equipment is useless. .Today we come together to talk about the topic of cable, hoping to buy for everyone, making the network cable to provide some reference. .

Cable classification and buy

broad network cable, including coaxial cable, telephone lines, fiber optic and .twisted pair. .According to the IEEE Ethernet standard developed using the ordinary local area network star topology is most suitable for use twisted pair. .Twisted pair using rubber as housing materials, and contains within 4 to 8 different colors of plastic quality copper wire. .Each two-wire twisted weave together according to certain rules, as a core pair. .It consists of unshielded twisted pair (UTP) and shielded twisted pair (STP). .Shielded twisted pair (STP) costs are high, in theory, can better shield the electromagnetic interference signal, but due to its high environmental requirements network construction, in practice we often find that shielded twisted pair (STP) not as good as non-shielded .twisted pair (UTP). .Starting from the cost and maintainability, and now most of the LAN are using unshielded twisted pair (UTP), we usually purchase this cable is unshielded twisted pair (UTP). .

shielded twisted pair (STP)

unshielded twisted pair (UTP)

internationally accepted standard EIA/TIA-568 cable into the twisted-pair Category 3, 4 .category, Category 5, 5e, Category 6, Category 7, 6 species. .Category 3, 4 classes suitable for older 10Mbps standard twisted-pair network, Category 5 is the standard 100Mbps network products, Cat 5e can be applied to 1000Mbps network. .And Category 5, 5e and so compatible with low-level network. .

cable category to indicate

We recommend that you buy over Category 5 cable .facilitate the future use 1000Mbps network. .However, there are many on the market today use Category 3 or Category 4 Category 5 cable and ultra-fake Category 5 cable, there are some counterfeit appears. .They generally have to distinguish between the following several ways:

1, the quality of packaging. .Twisted pair on the market are sold into the boxes, each box is 300 meters. .Twisted pair of genuine good packaging materials and printing cartons should have a relatively clear, but in most cases outside of the carton has a security label. .

2, twisted shell of the work. .Twisted pair of insulated leather should be printed on the origin, performance standards, product type, line length and other information. .Five lines of the logo is "cat5", the identity of UTP cable is "cat5e", six lines of the logo is "cat6". .The skin on the printed "CAT5", "5E" and other products containing capital letters the word is often more suspicious. .If you look suspicious twisted hard paint the surface of printed words was likely to put them out of the color of paint. .

3, twisted-pair can be easily bent. .Informal vendors in the production of cable will need to take into account the cable bent, twisted pair in the manufacture of them will make the skin more pliable and can stretch. .Production of low-quality line of profiteers often cut corners to save costs, and consequences of doing so is difficult to recover after cable bending. .To a network cable to the fold, if it can pop up the status quo is that it is authentic. .

4, whether there is flame retardant jacket. .To ensure safety, twisted pair is the ordinary flame-point non-flammable. .Good fire with a lighter point directly into the skin, a good cable under the skin will gradually melt deformation in the grill, but will not ignite to. .

5, twisted-pair twisted way. .Not only good-quality twisted-pair cable for each mode are twisted counterclockwise, but also between the four pairs twisted counterclockwise manner. .Average strand twisted around the wire length as the density, the general line of super category 5 twisted than Category 5 cable density, Category 5 cable stranding density is larger than the three categories. .Stranded off-line density, will look more loose. .

6, SMIC twisted pair line color. .If we peel the outer layer of rubber twisted pair, we can see the inside of 4 to 8 cores, they are white orange, orange, white and green, green, white, blue, blue, white, brown and brown. .Category 3 line only four cores, only the part of the core wire coloring to it disguised as 8-core cable Category 5 cable. .So, fake wire line will be forced to paint fade. .

7, home measured. .In the home PC to PC through the "My Network Places" to copy files, three types of lines can be achieved as the fastest LAN rate is 20Mbps (2.5MBps), so long as the copy rate is greater than 2.5MBps can prove that the network cable is to support 100Mbps .the network. .

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