Considerations for integrated wiring Testing

Integrated Cabling system testing is a commonplace issue, because of its position in the integrated wiring system, we still need to deeply analyze the problems in the actual operation, which is very important to testers, and also an important part of the integrated wiring system scheme.

More than 5 and 6 types of integrated cabling system is currently in the 1000-point system, the most used in the integrated wiring system, widely used in office buildings, campus Network, Park network, all kinds of intelligent buildings and intelligent residential wiring system, and even in automated production systems and industrial Ethernet has also begun to be a large number of uses. As a result of the users of various applications of the actual data bandwidth is not high, unless the quality is really very poor system, most of the normal quality problems of the system and even serious quality problems are generally hidden deep, usually in a few years or even more than 10 years will be exposed, and this time long past the quality of retrospective, Most users can only use redundant links and ad hoc tinkering to maintain a large bandwidth application after the upgrade, or simply scrap the original system and reconfigure the cabling system test to solve the legacy problems. Early replacement of the system will result in budget losses, as the rewiring takes time, many users are more interested in lost business hours and related profits.

Selection of test standard for integrated cabling system

The Small Network General Choice 5 Class line system, the construction staff after the laying completion generally will make a pass test (to see whether the 8 LEDs on the pass-and-break tester are lit), or on the side of the construction side carries on the small batch to pass the test, if no question can "the completion". At present, all such applications only in 10M Ethernet can be fully supported (3 line can be satisfied), so, users often can not find the wiring system hidden quality problems, because only to do the pass test is not able to determine whether the network cabling system to meet the requirements of the 5-class system. Even if there is a serious quality problem, it will not be exposed immediately. More than a few years later on a number of large bandwidth applications, will find problems, and high-definition format large bandwidth video applications are not yet popular, but also because the Internet bandwidth expansion speed relative to the needs of the network user's growth rate is rather slow, The lag of the construction of metropolitan area network restricts the popularization speed of the local high speed bandwidth video application. On the basis of optimistic estimates, the user himself found that the wiring system has serious quality problems in the fastest time will be 3-5 years later.

For medium or large network or some of the high reliability requirements of small and medium-sized networks, its planners generally have a number of integrated cabling system quality testing knowledge, and some users are even familiar with such as GB gb50312-2007 such a comprehensive cabling quality testing standards. Because of the complexity of its own network structure, although not all, but some users of the bandwidth consumption will be relatively large, such as VOD privileged users, especially the data centralized users, because the quality of the data center requirements, the application speed, only testing through the break is not guaranteed that the link will be able to achieve the requirements of these applications.

More Wonderful content: http://www.bianceng.cn/Network/zhbx/

So, does the small network and the common user link do not need to do the quality acceptance test? Of course not, the problem with small users is that they are in a very passive position in a quality assurance system, because does not understand the quality inspection acceptance standard, how to accept the comprehensive wiring system generally is "passively" listens to the system integrator and the engineering contractor (Party B), installs the engineering business opinion, as long as the cable link is connected, That means the link quality is qualified.

Whether small network users or large and medium-sized network users, in fact, as long as a simple grasp of the integrated wiring system testing standards and testing methods and adhere to the completion of the network quality testing, you can easily control the construction quality wiring system. Because the test instrument can automatically according to the standard acceptance test, judge whether the test result is qualified, therefore the user does not need to understand the standard parameter kind, the definition, the standards request and so on detailed question.

Domestic popular acceptance of the general wiring system testing of the "universal Standard" has three: tia568b (2002), Gb50312-2007, ISO11801 (2002), the use of the proportion of 90%, 5%, 4%, a total of about 99%. Other 1% users may use such " Application-Standard "for testing.

Selection of "third party test"

According to a survey conducted by Fluke Company, 30% of the networks in the 5-class system (500~1500 cabling link) still have a simple connectivity test and do not choose to test by acceptance testing standards. However, 93% of the 6 types of systems in medium and large networks have selected acceptance tests. The test results in the acceptance test often lead to some "interpretative controversy".

For example, a 105m-long 6-Class link, the test results show "qualified", but the first Party data center technicians from the intuitive feeling that this link is only about 70 meters, it is impossible to have 105m, and then asked for a test, the results show the length of 73m, Party A further suspects that the test report provided by party B has problems, then asked the third party to sampling, the results found that the test results length and parameters of 87% are not on the number (party B is based on the length of the cable link calculation, collection of installation costs), the passing rate is not provided by party B 99%, but 92%, Party A requires that all links in the system be integrated into the cabling system test again.

After the completion of the installation of party B will generally provide a copy of all cable links of the Self-Test report, some party a will be the Self-Test report as acceptance report of the test data into the acceptance document. But because the test report is an electronic version, some party a will have doubts about the authenticity of such test reports, so they chose a third party test. Third-party testing can be a partial sampling, or it can be entirely entrusted to a third party independent acceptance testing. In order to ensure the accuracy of the data, GB gb50312-2007 the proportion of sampling generally not less than 15%, less than 100 according to 100 starting test. Wiring system is qualified to judge the method is: if the qualified rate of sampling object is not less than 99%, then infer all wiring system qualified. If the sampling pass rate is below 99%, it needs to be tested all the time and not just sampling, once to judge the final true pass rate.

Some users will not only entrust a third party to carry out sampling or full inspection, but also require a third party to help put forward the unqualified link rectification opinions and measures, and guide party B to troubleshoot and repair, until the final Test acceptance pass. The third party at this time is not only the identity of the acceptance tester, to some extent, the third party is also tied to party B's interests, which seems to be easy for party A, but the third party's "neutrality" will be seriously weakened, and caused a large number of mass accident concealment events.