Question 1: How to quickly distinguish the quality of network cables? For general household use, look at the incision to see if it is pure copper. Don't buy copper-clad aluminum.

Use scissors to cut the network cable and see if the cut is copper or aluminum.

Question 2: How to identify the quality of the network cable? Excerpted from IT168:

In the network, the network cable may be ordinary, ordinary is ordinary, but we surf the Internet every day and enjoy online games. The bloody battles all rely on this thin network cable to transmit and exchange important data.

When it comes to network cables, many people will think that there is nothing to talk about network cables, but they are only used for surfing the Internet or connecting to the Internet. Wire. In fact, when we talk about network cables, we generally refer to twisted pairs. There are generally two types of network cables: one is coaxial cable (basically eliminated), and the other is twisted pair. Twisted pair can be divided into: shielded twisted pair and unshielded twisted pair, which are used in most local area networks. Unshielded Twisted Pair (UTP-Unshielded Twisted Pair) is used as the transmission medium for wiring to form a network. The network cable is composed of a certain distance of twisted pair and an RJ45 connector. The twisted pair wire is divided into 4 pairs of 8 wires of different colors and twisted together. The function of twisting in teams is to minimize the influence of electromagnetic radiation and external electromagnetic interference. The twisted pair wire can be divided into 4 pairs according to whether it is covered with a metal mesh cover. The shielding layer is divided into shielded twisted pair (STP) and unshielded twisted pair (UTP). In the EIA/TIA-568A standard, twisted pairs are classified according to their electrical characteristics: Category 3, Category 4, and Category 5. The most commonly used lines in the network are Category 3 lines, Category 5 lines, and Category 5e.

In the network market, there are countless places selling network cables (twisted pairs). The types of network cables most users purchase are generally Category 3 cables and Category 5 cables. The third type of twisted pair is commonly used in LAN for data and voice transmission of 10Mbps Ethernet and complies with the IEEE802.3 10Base-T standard. Category 5 twisted pair currently occupies the largest LAN market, with a maximum rate of 100Mbps. Since many consumers don't know much about network cables, many merchants sell some Category 3 cables as Category 5 cables. While selling network cables, there are also varying degrees of "shortage" phenomenon. Therefore, when purchasing network cables, you must find a merchant with a good reputation.

We can also find some high-quality Category 5 unshielded twisted pairs in the market, such as Category 5 twisted pairs for 10 Gigabit networks. This Category 5 twisted pair is not a "fake" twisted pair on the market, it is a genuine Category 5 twisted pair (many businesses sell Category 3 wires as Category 5 wires). Judging from the appearance of the wire, the twisted pair wire uses hard glue with good texture and good heat resistance and cold resistance as the outer skin, so that it can survive in more severe environments without breakage and wrinkles. It uses 8 copper wires with very solid workmanship, and it is not easy to break after repeated bending, and has strong toughness. There is nothing else to say. As a network cable, it depends on its actual working performance. We connected this network cable to the network. In order to reflect the speed of the "100MB" network cable, we compared it with a 10MB Category 3 twisted pair cable and found that copying things between the two machines would be much faster ( Copying the same file in Category 5 is more than twice as fast)! Although the speed does not reach the nominal 100MB, for this speed, it is quite sufficient for surfing the Internet and connecting to large-scale LAN games such as CS World of Warcraft.

In order to make some profits, some vendors now use network cables that are only a few centimeters long or as long as more than ten centimeters. Consumers are deeply disgusted by the fact that the existing network cables are not long enough. Therefore, everyone must be careful when purchasing. It is best to wear the tape measure yourself. Many vendors make the tape measure scales themselves.

In the field of twisted pair cables, AMP's twisted pair cables have a high reputation in the market. But now many places sell fake twisted pairs as AMP. Here are some ways to identify AMP. First of all, in terms of appearance, Category 5 cables are generally marked with words like "AMP SYSTEMS CABLE...24AWG...CAT5", among which "AMP SYSTEMS CABLE" represents the AMP brand. logo, CAT5 stands for Category 5 twisted pair.

These data are usually printed on the surface of the twisted pair. Buyers must pay attention to the clarity of the font. If the font is blurry and easy to erase, it may be a counterfeit twisted pair. Then check whether it is easy to bend. Due to the convenience of wiring, twisted pairs are generally easier to bend. Then it depends on the toughness of the copper core wire. The flexibility of the copper wire of a good twisted pair is relatively good. Finally, we need to look at the flame retardancy of the skin. You can put it in a fire to observe. Flame-retardant twisted pairs will become soft when heated and will not burn immediately. And all network cabling is concentrated in air-conditioned offices...>>

Question 3: How to judge the quality of network cables? 1. Look at the markings on the outer sheath of the cable. The markings on the inferior network cables are blurry and unclear, which makes you feel that they are not of high quality.

2. Peel off the sheath and look at the wire pairs inside. The color printing of the genuine wire pairs is clear. , and the color of the wire pair of inferior wire is likely to be blurred or even discolored;

3. Untie the wire pair and fold the wire core at an angle to observe whether there is a big recovery in the wire core. If so, this The wire is not easy to use. I guess the copper core is so thin that it is made of plastic. A good network cable can be bent

at will and is not easy to break.

Generally, it can be basically identified through these three points plus comparison with genuine network cables.

Question 4: Are there good or bad network cables? Network cables are the most inconspicuous and most easily overlooked component of a computer network. When building a network, most people will pay attention to switches, routers, network cards and other equipment, but generally they are not too picky about network cables, or they are more willing to buy cheap products.

However, as the scale of the network expands, the demand for network cables continues to increase, and the profits brought by network cables are gradually valued by counterfeiters. Judging from the network cable products of several brands such as AMP, Lucent AVAYA, Simon, and IBDN currently on the market, almost every company is facing the encroachment of fake products on the market. It can be said that it is a mixed bag and it is difficult to distinguish the genuine from the fake.

Take the Category 5e twisted-pair network cables that are widely sold on the market as an example. The price per meter ranges from 1 yuan to more than ten yuan. Of course, there are many cheap fakes, and high-priced ones. There is no guarantee that the quality will be good, leaving buyers at a loss.

1. Test the speed of the network cable

Testing the transmission speed of the network cable is the most effective way to identify the authenticity of the quality of the network cable; during the test, in order to be closer to the actual use environment, while reducing the external environment For the interference link, the author recommends using a dual-machine direct connection method. At the same time, in order to ensure the accuracy of the test, try to use a high-quality brand network card to ensure that no hardware bottleneck occurs during the test; at the same time, the computer system must be clean, tidy, and running fast, otherwise the running speed of the computer itself will affect the network cable transmission speed. In addition, when connecting network cables, try to use good quality crystal connectors and ensure that the wire connectors are standardized. Only in this way can the impact of external factors on the transmission speed of the network cable be reduced to a minimum.

2. Check the flexibility of the network cable

Good-quality network cables are designed with the convenience of wiring in mind and should be as flexible as possible. No matter how they are bent, they are convenient and not easy to bend. Been broken. At present, in order to obtain high sales profits, many profiteers on the market add other cheap metal components to the originally pure copper quality network cables. In this way, the cost of the network cables will be reduced, but the quality and performance of the network cables themselves will not be the same. Similarly, the phenomenon shown is that the texture of the network cable is no longer so soft, and the transmission speed of the network cable is also greatly reduced. If such a network cable is repeatedly bent during the wiring process, the copper cable inside the network cable may be broken. Of course, if you find that the network cable is too soft, you should also be aware that it may be a fake product.

3. Test the flammability of network cables

Generally speaking, the materials that make up network cables must be resistant to combustion. Otherwise, if there is a fire or something, the losses will be heavy. Therefore, when choosing a network cable, you must check the flammability of the cable's outer sheath to identify the authenticity.

During the specific test, you can first use scissors to cut the outer sheath of a network cable about 2 cm long, and then use a lighter to burn the outer sheath. The outer sheath of a genuine network cable will gradually melt and deform under the barbecue of fireworks, but the outer sheath will certainly not change on its own. If it is found that the outer sheath of the network cable cannot withstand the test of fire and burns at a moment's notice, then no matter how high the transmission speed of the network cable is, you should give up the choice. After all, such a network cable is very unsafe in the wiring project. Using it will leave A huge safety hazard. The author once found a piece of genuine network cable and a fake network cable, and lit them with a lighter at the same time. I found that after 6 seconds, the genuine network cable just emitted white smoke and gradually melted and deformed over time, while the fake network cable burned out in less than 2 seconds. It was easily ignited and produced a large amount of black smoke.

4. Test the temperature resistance of the network cable

In the wiring project, there are very high requirements for the network cable to resist changes in external temperature. Not to mention that it can resist any environmental changes, at least the network cable cannot Be softened or cracked by freezing in high or low temperature environments. In order to ensure that the performance of network cables is not affected in high-temperature environments, the outer sheath material used in genuine network cables can withstand high temperatures up to about 50 degrees, and will not cause the network cable to be softened or deformed. If you cut off a small section of the network cable sheath and place it next to the stove for a period of time, and you find that the sheath is softer than the normal sheath, it means that the quality of the network cable is definitely not too hard.

5. Identify the marks on the outer skin of the network cable

When actually selecting a network cable, sometimes there is a lack of testing environment or conditions, and it is impossible to test the quality or material of the network cable through the above method. At this time, you may wish to identify the authenticity of the network cable by observing the logo on the outer skin of the network cable. Under normal circumstances, the network cable of a regular brand has the type mark of the network cable and the manufacturer's trademark on the outer sheath. For example, the CAT5 mark means that the network cable is a Category 5 line, and the CAT6 mark means that the network cable is a Category 6 line; if there is no mark on the outer sheath of the network cable, If not... >>

Question 5: How to distinguish the quality of network cables? If the merchant is more honest, you basically get what you pay for. If it is too cheap, don’t buy it. . When actually selecting a network cable, sometimes there is a lack of testing environment or conditions. You may wish to identify the authenticity of the network cable by observing the mark on the outer skin of the network cable. Under normal circumstances, the network cable of a regular brand has the type mark of the network cable and the manufacturer's trademark on the outer sheath. For example, the CAT5 mark means that the network cable is a Category 5 line, and the CAT6 mark means that the network cable is a Category 6 line; if there is no mark on the outer sheath of the network cable, If not, everyone should be more vigilant and find ways to create conditions to test and identify network cables according to the above methods. Of course, false marks cannot be ruled out, so look at the thickness of the network cable yourself, peel off the outer cover and compare, the thicker the better.

Question 6: Which brand of network cable is better? How to identify the quality of the network cable? Commonly used brands include Benlang, CommScope, Anpu, etc. When looking at network cables, you must first look at the copper core. Pure oxygen-free copper is the best for transmission. Now there are many copper-clad copper, copper-clad aluminum, and copper-clad iron on the market. These are cheap but No, you can tell by scratching it with a knife. It also depends on whether the material is recycled material, the twist length of the twisted pair, etc. There are many ways to identify it

Question 7: How to identify How good is the quality of the network cable? Objective parameters such as the characteristic resistance and crosstalk of the cable need to be detected by a professional line patrol instrument. Generally speaking, for CAT, a cable with a softer feel indicates a higher copper content and better transmission performance than a cable with a harder feel. The CAT insulation layer should be fire-resistant, and the CAT insulation layer should not burn when burned. The core torque of the wire should be regular and there should be no twisting of the wire core.

Question 8: How to judge the quality of the network cable? The best way is to try another one! Otherwise, you can only use instruments!

Hope you adopt it!

Question 9: How to distinguish the quality of the network cable 1. Fold the network cable 180 degrees, and then turn it back to see how the folding resistance of the outer cover is. If it is a good quality network cable, the outer cover will not bend no matter how hard it is. There will be too obvious whitening. If the bad ones are removed, you will see obvious whitening. The network cables with good outer covering are not easy to break during the comprehensive wiring construction process.

2. Whether the copper core in the cable has good toughness. In order to prevent the twisted pair from breaking during movement, in addition to the outer protective layer, the internal copper core must also have a certain degree of toughness.

3. Whether it is flame retardant. In order to avoid cable damage caused by high temperature or fire, the outermost sheath of the twisted pair should not only have good tensile properties, but also be flame retardant (you can test it by burning it with fire: if If it's genuine, the rubber will become soft when heated and won't catch fire; if it's fake, it'll burn in just one click).

Question 10: How to identify the quality of network cables? The first thing to check is whether it is a shielded cable.

Network cables include shielded cables and shielded cables. We generally use unshielded cables. Mega cable is a shielded cable

The second thing to check is whether there is a delay in the signal

You can use a line tester to detect it