In security monitoring, videoconferencing or related industries, the range of applications for network cables is becoming wider and more frequent. With the habit of modern people buying products, they will go online to check prices. Once Ali, or Taobao or any other discovery network cable, the price difference is still quite large, everyone will be very tangled and would like to understand why the same equipment With such a big difference in price, some people may choose cheap prices for temporary savings, and some may choose to use them at ease and choose expensive ones. Then how do we properly choose a good network cable, preferably at a more favorable price.
1, the classification of network cable
The standard of the three types of cable is “CAT3â€, with a bandwidth of 10M. It is suitable for 10M network and has basically been eliminated. The standard of Category 5 cable is “CAT5â€, and the bandwidth is 100M. It is suitable for networks below 100M; Super Category 5 cable. The standard is "CAT5E" with a bandwidth of 155M, which is currently the mainstream product; the standard for Category 6 cable is "CAT6", and the bandwidth is 250M. It is used to set up Gigabit network and is the trend of future development.
2, the determination method
Twisted pair test in a high temperature environment, look at 35 degrees Celsius to 40 degrees Celsius, the rubber outside the cable will not become soft, really the cable will not be soft, false is not necessarily; Copper wires are generally used in twisted-pair cables as cores, which are relatively soft, and some unscrupulous manufacturers add other metal elements to the copper in order to reduce costs during production. The wires are hard and difficult to bend. Easy to break; also, really outside the network cable is also flame-retardant, and some of the fake is not flame retardant, does not meet the safety standards, try to buy.
These tricks alone are still far from being able to deal with all counterfeit network cables. Some counterfeiters use the cores of the three types of cables to put on the outer skin of the five types of lines. This method of counterfeiting is very subtle and difficult to distinguish with the naked eye. This type of false network cable can also reach the transmission speed of the Category 5 cable within a short distance. However, when the distance is long, there will be problems such as slow transmission speed, loss of transmitted data packets, or simply no signal detection.
For this feature, you can take a piece of network cable to test: Take a hundred meters of network cable to connect the computer network, use the "System Monitor" in Windows 98 or "Network Monitor" in Windows 2000 to test it yourself, if the test speed reaches 100Mbps, This indicates that it is a Category 5 twisted pair. If it is only 10 Mbps, it means that the cable used is a Category 3 conductor.
This method can not only correctly distinguish between Category 3 and Category 5 cables, but also can be used to test whether the twisting degree of each pair of conductors in a twisted pair cable is in line with the standard. At the same time, it can also measure whether the metal media in the conductor is qualified. It should be noted that the length of the twisted pair should be a standard length of 100 meters when the network speed test is performed, otherwise the measured data has no practical significance.
1, the classification of network cable
The standard of the three types of cable is “CAT3â€, with a bandwidth of 10M. It is suitable for 10M network and has basically been eliminated. The standard of Category 5 cable is “CAT5â€, and the bandwidth is 100M. It is suitable for networks below 100M; Super Category 5 cable. The standard is "CAT5E" with a bandwidth of 155M, which is currently the mainstream product; the standard for Category 6 cable is "CAT6", and the bandwidth is 250M. It is used to set up Gigabit network and is the trend of future development.
2, the determination method
Twisted pair test in a high temperature environment, look at 35 degrees Celsius to 40 degrees Celsius, the rubber outside the cable will not become soft, really the cable will not be soft, false is not necessarily; Copper wires are generally used in twisted-pair cables as cores, which are relatively soft, and some unscrupulous manufacturers add other metal elements to the copper in order to reduce costs during production. The wires are hard and difficult to bend. Easy to break; also, really outside the network cable is also flame-retardant, and some of the fake is not flame retardant, does not meet the safety standards, try to buy.
These tricks alone are still far from being able to deal with all counterfeit network cables. Some counterfeiters use the cores of the three types of cables to put on the outer skin of the five types of lines. This method of counterfeiting is very subtle and difficult to distinguish with the naked eye. This type of false network cable can also reach the transmission speed of the Category 5 cable within a short distance. However, when the distance is long, there will be problems such as slow transmission speed, loss of transmitted data packets, or simply no signal detection.
For this feature, you can take a piece of network cable to test: Take a hundred meters of network cable to connect the computer network, use the "System Monitor" in Windows 98 or "Network Monitor" in Windows 2000 to test it yourself, if the test speed reaches 100Mbps, This indicates that it is a Category 5 twisted pair. If it is only 10 Mbps, it means that the cable used is a Category 3 conductor.
This method can not only correctly distinguish between Category 3 and Category 5 cables, but also can be used to test whether the twisting degree of each pair of conductors in a twisted pair cable is in line with the standard. At the same time, it can also measure whether the metal media in the conductor is qualified. It should be noted that the length of the twisted pair should be a standard length of 100 meters when the network speed test is performed, otherwise the measured data has no practical significance.
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