Test situation of wire and cable in integrated wiring system

The installation of the LAN starts from the cable, which is the most basic part of the network. According to statistics, about 50% of the network failure and cable-related. It can be seen that the quality of cable itself and the quality of cable installation directly affect the healthy operation of the network. In addition, many cabling systems are carried out in the construction, and cables are laid through pipes, floors or carpets to each room. When the network is running, it is difficult or impossible to repair the cable when it is found that the fault is caused by the cable. Even the cost of fixing it is quite expensive. The best way is to eliminate the cable from the installation. Currently the most widely used cable is coaxial cable and unshielded twisted pair (commonly known as UTP). According to the speed at which the signal can be transmitted, the UTP is divided into three or four or five categories. Most of the current users for future upgrades to high-speed network considerations (such as 100MHz Ethernet, ATM, etc.), most of the installation of UTP five lines. So how to detect the installation of the cable is qualified, it can support the future of high-speed network, the user's investment can be protected is a key issue, which is the importance of cable testing. Cable testing can generally be divided into two parts: cable verification Test and cable certification test.

1. Cable Verification Test

The verification test for the cable is the basic installation of the test cable. Verification test is in the construction process during the construction side of the test, the purpose is to solve the integrated wiring installation, the correctness of the line, for example, the cable has no open or short circuit, UTP Cable at both ends of the relevant provisions of the correct connection, coaxial cable terminal matching resistance is good connection, cable direction and so on. One of the special errors noted here is string winding. The so-called string-winding is to separate the original two pairs of lines and then to form a new round pair. Because the end and end connectivity of the fault is good, so the multimeter is not found. Only a cable tester with a dedicated line (such as a fluke 620/dspl00) can be checked out. A string-winding fault is not easy to find because it does not perform well when the network is running at low speeds or when traffic is low, and it has a huge impact when the network is busy or running at a high speed. This is because a string wrap can cause very large near-end crosstalk (NEXT). The verification test of cable requires convenient and fast use of test instruments. For example Fluke620, it can complete a variety of tests without requiring a remote unit, providing great convenience to users. More Wonderful content: http://www.bianceng.cn/Network/zhbx/

2. Cable Certification Test

Integrated wiring certification test is the most important part of all test work, also known as completion test. The performance of the integrated wiring system depends not only on the design of the integrated wiring scheme, but also on the quality of the equipment selected in the project. Certification test is to test the level of engineering design and project quality of the overall level, for the integrated wiring system must require certification testing. Certification testing is usually divided into two types: self-authentication test and third party authentication test.

Self-test by the construction side of their own organization, in accordance with the design and construction plan for each link to test the project to ensure that each link is in line with the standard requirements. If the final compliance link is found, it should be modified until the test is qualified, at the same time compiled into an accurate link file, write the test report Kat.

Because the integrated wiring system is a complex computer network basic transmission media, the project quality will directly affect whether the computer network can be opened according to the requirements, whether the use of quality assurance. Five types of Gigabit Ethernet support, Super Five and six types of twisted-pair integrated cabling system, and the extensive use of optical fiber to the desktop, so that the requirements of construction technology more and more stringent, this not only requires wiring construction side to provide wiring system of the self-certification test, but also commissioned a third party to the system for acceptance testing, To ensure the quality of wiring construction. This is the integrated wiring system acceptance of quality management of standardized practices.