According to statistics, in the cause of network fault, more than 90% of the problem of failure due to cable link, but the problem is not only with visual or multimeter can be detected in the shortest possible time. How to grasp the quality of these medium to ensure the unobstructed transfer information? In the process of the construction of network, it is important to note that the cable use formal test instrument for testing.
In general, the card won't easily strike, mostly set and hardware connection errors caused by the network fault. In checking the network failure, can generally from the network Settings of system (mainly check the IP address, DNS and gateway is wrong or missing, etc.), then check the physical connection. Specific failure will be a lot of, such as twisted-pair cable connectors are in good condition, twisted pair to see if there is fault, a hub of slot would work (in a slot to try).
Twisted-pair cabling is easier to appear in the process of network "tong" and "no" line sequence problem. Many users often appear one kind is used in wiring error one-to-one connection method, when the connection distance is short, the system will not appear on the connection failure. But when the connection distance is longer, the network is busy, or running at a high speed is easy... , its core is to let two pin 3 and 6 for the same ground to (in T568A or T568B standards to link). A user's server and switch distance from 5 meters to 60 meters, under the same link method but no matter how to also connection impassability, why? In Ethernet, general is the use of two pairs of twisted pair, arranged in the position of the 1, 2, 3, 6, if you use not two on line, but the will to use the original line used separately, can form series wound crosstalk (SplitPair error refers to the lineup without the installation in the correct line, the resulting transmission performance failure), has a larger effect on network performance. 10 m network environment is not obvious, 100 m if large flow or long distance under the network environment, networks would be unable to connect to. The above phenomenon, it is for this reason, as a result of 3, 6, unused matching line, in the case of short distance is not problems, but once the distance is longer, the fault is generated. Only need to do the RJ45 head in line sequence again after, can everything is back to normal. In addition, there are several twisted-pair cable manufacturers in order to better than twisted-pair performance standards, in the four pairs of twisted-pair cable have two pairs of entangled degree is higher than the other two for some, ha ha, of course, is the standard of orange, orange, white and green, green, white, so it is best they do 1, 2, 3 and 6.
So, in the process of network construction, integrated wiring, after the completion of testing twisted-pair cable. Structured cabling unshielded twisted pair test can be divided into conduction testing and certification testing. Conduction test pay attention to the connection performance of structured cabling, don't care about the electrical characteristics of structured cabling, can guarantee the complete of each connection is correct. And certification test refers to the structured cabling system in accordance with the standards for testing, to determine whether the structured cabling all meet the design requirements.
Usually structured cabling channel performance depends not only on the construction technology of the wiring, also depends on the cables and related connection hardware quality, must do so on structured cabling certification test, also known as the five types of test certification. Through testing, we can make sure that the installation of connection cables, hardware and the process can meet the design requirements, the tests included joint performance testing and electrical performance test. Cable installation is a predominantly installation process work, because no one can work completely and correctly, to ensure that the cable installation meet the requirements of performance and quality, we must develop a link test. In the absence of testing tools, connection work some errors may occur. Common connection errors are cable label wrong, connection open circuit and short circuit, etc.
Certification test does not improve integrated wiring channel performance, just make sure that the installation of connection cables, hardware and the process can meet the design requirements. Only use can satisfy the specific requirements of test equipment and in accordance with the corresponding test methods for testing, the results are valid. For example, using five types of Pentascanner5 type tester tests. Method is: use tester connection on both ends of the jump line first, then according to this test, and then press F1 showed test results, the final print test results.
Some problems in the testing process basically has the following several aspects:
Near end crosstalk is not through the cause of the problem may be the proximal connection problems, or because the string, external interference, the remote connection cable short circuit, link and connection hardware performance problems, is not the same kind of product, and the termination of the cable quality problems and so on.
Wiring diagram is not through the cause of the problem could be open circuit, short circuit at the ends of the joint, cross or broken, or because the jumper error, etc.
Attenuation is not through the cause of the problem may be the cable is too long or the temperature is too high, or join point problem, may also be a link cable and the connection of hardware performance problems, or are not the same kind of product, it is also possible that the termination of the cable quality issues, etc.
Length is not through the cause of the problem may be the cable is too long, open circuit or short circuit, or equipment attachment and presidents have long jumper.
Tester breakdown the cause of the problem may be the tester is not start (can be used to replace the battery or charging method) to solve the problem, the tester can't work or remote calibration, tester is set to not correct cable types, the structure of the tester is set to the wrong link, automatic tester cannot store the test results and the tester can't print storage automatic test results, etc.