Testing of the integrated wiring system of the intelligent community
The integrated wiring system project is the basic channel for information transmission in the intelligent community. It is a very important engineering link to conduct strict engineering testing and engineering acceptance of its entire transmission channel to ensure the quality of the project and protect the investment benefits of the owner. It is also important to verify the wiring project safety measures. Test data is an important part of project acceptance, and has a guiding role in maintenance, repair, management, future capacity expansion, and system upgrade. 1. Development and standards of integrated wiring The overall development process of integrated wiring in China can roughly go through four stages: The first stage is the introduction, digestion and absorption, preliminary engineering application stage, which is reflected from 1993 to 1995. The second stage is the stage of widespread promotion and application, focusing on project quality, which is reflected in 1995-1997. The third stage is reflected in the exploration and innovative application stage, which is reflected in 1997-2000. The fourth stage is reflected from 2000 to the present. Due to the development of communication networks and the emergence of Category 5 and Category 6 cables, related standards TIA / EIA-568-B and ISO / IEC11801: 2000 have appeared one after another, and high-speed Ethernet is widely used. With the increase of domestic intelligent projects, the construction quality of wiring projects is becoming more and more important. The Ministry of Construction, referring to international and domestic standards, issued the "Code for Acceptance of Intelligent Building Engineering Quality" GB50339-2003 in 2003 as a testing agency A basis for it, it clearly stipulates the detection content and acceptance rules of the integrated wiring system. This standard is formulated with reference to the American standard-ANSI / EIA / TIA-568A and international standards (such as TSB67), which is only applicable to Category 5 cabling projects. It is not involved in Category 5e, Category 6 and Category 7 and therefore Category 5 , Category 6 and Category 7 shall be implemented with reference to international standards. On the other hand, for Category 5 and above integrated wiring used in high-speed broadband occasions such as Gigabit Ethernet and ATM, the accuracy requirements of electrical performance test methods and test instruments should meet the requirements of YD / T1013-1999 "General test method for electrical characteristics of wiring systems". In actual testing, it should be carried out in accordance with national standards and with reference to international standards and American standards. International standards mainly include ANSI / EIA / TIA-568B "Commercial Building Communication Cable Wiring System Standard", ANSI / EIA / TIA-568BB.3 Optical Fiber Wiring Component Standard, and ISO / IECI1801: 2000+ "Information Technology-User Building Synthesis "Wiring", the international standard defines Category 6 and Category 7 cable standards; the Category 5 / Class D cabling system is redefined as Category 5+ to ensure that the Category 5 / Class D cabling system can operate on Gigabit Ethernet, and also defines The laboratory and field test comparison methods are clarified, and the field test method is clarified. The cable test method of the jumper work area refers to the test process and the accuracy requirements of the corresponding test instruments. The current testing standards for the integrated wiring system used in China are as follows: "Code for Quality Acceptance of Intelligent Building Engineering" GB50339-2003 "General Test Method for Electrical Characteristics of Integrated Wiring System" YD / T1013-1999 "Commercial Building Communication Cable Wiring System Standard" ANSI / EIA / TIA-568B "Fiber Optic Cabling Components Standard" ANSI / EIA / TIA-568BB.3 "Information Technology—Comprehensive Cabling of User Buildings" ISO / IECI1801: 2000+ Second, the test project of the integrated wiring system The test of the integrated wiring system can be divided into three categories: verification test, qualification test and certification test. The selection of test equipment is basically these three types, although there will be some overlap in function between them, but the test equipment used for each type of test has its own specific purpose 1. Verification test The verification test is that during the construction process and before acceptance, the builder performs a construction connectivity test on the transmission link that is laid. The test focuses on testing the connectivity of the transmission link, discovering problems in a timely manner and predicting the link parameters after construction Make sure the quality of the project is in order to pass the acceptance. For example, after completing each floor, test the horizontal line and the information socket. Verify that the test instrument has the most basic connectivity test function (such as wiring diagram test) to solve whether the cable connection is correct, and test the performance of the cable and connected parts, including open circuit and short circuit. Some test instruments have additional functions to test cable length or locate faults. The verification test equipment should be used in the field environment with easy operation. According to the cable tester used (such as DSP40000) or single-ended cable tester (such as F620) for on-demand testing and stage construction test, the specification indicates that there are two basic connection and channel test connection methods. The test connection diagram can be connected according to the basic link test connection method. Single-ended test only connects to the host of the tester and does not need to be connected to the remote unit of the tester. The basic link refers to the fixed link part of the wiring project, including the longest 90m horizontal cable and a connection point at each end. The channel test connection mode is used to test the end-to-end link, including the overall channel performance of the user terminal connection line. 2. Identification test The qualification tester not only has the functions of the verification tester, but also needs to be enhanced. One of the most important capabilities of the identification tester is to determine the amount of network information that the tested link can carry. The TIA-570-B standard stipulates that link identification determines the network application technology (such as 100Base-Tx, FireWire, etc.) that the wiring system can support by testing the link. For example, there are two links but they do not know their transmission capabilities. Both link A and link B have passed the wiring diagram verification test; however, the qualification test will tell you that link A can only support up to 10Base-T, link B It can support Gigabit Ethernet. The identification tester can generate a test report, which can be used for document filing and management when installing the wiring system. A unique capability of this type of tester is that it can diagnose common cable faults that can cause the transmission capacity of the wiring system to be limited. This function is far beyond the basic connectivity test of the verification tester. The function of the qualification tester is between that of the verification tester and the certification tester. Compared with the verification tester is much more powerful, their design purpose is that the operator needs less training to determine whether the wiring system can "work"? If not, what is the reason? But in any case, they are incomparable in function with the certification tester, and it is impossible to replace the certification tester.
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