The computer network structured integrated wiring system (SCS) is the StructuredCablingSystem, bell LABS experts after years of research based on star launched the module system topology structure, it is also the LAN construction preferred system. The system has the practical and flexible, economy, can be modular and extendable etc, can realize data communication equipment and other information management system of connected, and these equipment and external communications network connection. This structure is easy to expand, extension methods simple also, any node changes will not affect other node of the work, and easy to maintain, and has high reliability. Through the use of SCS, users can accurately ruled out the network breakdown, effectively manage and control the whole network system.

SCS is the most basic, network of the most important parts, it is to connect every server and workstations bond. As the medium, high-speed data transmission cable requirement of SCS stricter, once cable produce fault, serious when can lead to the entire network system of paralysis. Therefore, in the wiring project completion, must to the wiring system to conduct a comprehensive test. Usually, the wiring company and enterprise's technical staff for all test group, information points for conduction tests, such as the five types of testing in accordance with all information points of 20% of the spot. Acceptance by the technical personnel after responsible for the daily maintenance and management of network

Test equipment and testing standards

Before the tests, we need to choose appropriate test equipment and testing standards. Usually, we adopt internationally recognized tested the tester. For instance, in the test of copper wire, we use cable test table basic connectivity (conduction) test. Five types of line of test, we adopt Microsoft Pentascanner5 class 5 class line test instrument. Doing fiber loss aspects of the test, we adopt Microsoft's cable tester for testing. At the same time, we choose EIA 76 standards as TIA568ATSB/test basis.

Specific test method

At present, the cable network construction use basically has 3 kinds, namely the optical fiber, the shielding twisted pair shielded twisted-pair cable quotation, parameters, pictures, group and coaxial cable. Optical fiber with high transmission rate, good anti-disturbance performance and features such as long-distance transmission, mainly for the main lines. The shielded twisted-pair cable is used more widely in recent years, it's the communication medium transmission performance is good, usable switch or hub to achieve switchboard, used to close transmission. Coaxial cable is early network extensive use of transmission medium, and because it has some malpractices in less now.

1. The shielded twisted-pair cable test

From engineering point of view, structured cabling not shielded twisted-pair cable test can be divided into two kinds, one kind is conduction test, one kind is the authentication test.

In order to ensure the quality and performance of wire &cable installed to meet the requirements in construction process, by construction personnel edge construction, this method is edge test conduction test, it can guarantee the completed every connection is correct. Structured cabling conduction test notice the connection performance, not care structured cabling electrical properties.

The authentication test of structured cabling system refers to the test, in accordance with the standards to determine whether structured cabling all meet the design requirements. Usually structured cabling channel performance depends not only on the wiring still depends on the construction craft, the cable and related links hardware quality, so for structured cabling must do, also called authentication test five types of test certification. Through the test, we can confirm that the installation of the cable and related links hardware and process can meet the design requirements, this kind of test includes links performance test and electrical performance test.

(1) link validation testing

Cable installation is a mainly by installation technique work, because nobody can completely and correctly work, to ensure that cable installed to meet the quality and performance requirements, we must conduct link test. The testing tool in no circumstance, connection may appear some mistakes. Work common connection error have cable label wrong, connect the opening and short circuit, etc.

(1) the opening and short circuit in construction, because tools, wiring skills or a wall inside threading technology problems such as lack of, can produce open or short-circuit fault.

(2) the reverse connect the same pair of lines at both ends at the needle bits, such as end is for 1-2, and the other end for 2-1.

(3) to a fault on the other end of the line received other pair online, such as end is 1-2, and the other end up in 4-5.

(4) around the so-called string string around refers to the original two line again respectively composed new opening the line on the. Due to appear this kind of fault when end-to-end connectivity remain intact, so use ordinary multimeters can't check out the fault reasons only through the use of special cable tester can check out.

(2) cable transmission channels of authentication test

The authentication test does not improve integrated wiring channel performance, just confirmed the installation of the cable and related links hardware and process can meet the design requirements. Only use can satisfy the specific requirements of the testing instrument and in accordance with the corresponding test methods for testing, the results are valid.

For example, using Microsoft Pentascanner5 class 5 types of testing, tester method is: first jump line ends with tester connection, then press AutoTEST tests, then the F1 display test results that last print a test results.

The authentication test content including Length, Next (Nearendcrosstalk), Attenuation, Attenuationtocrosstalk), WireMap Acr (LoopResistance Impedance, Capacitance, and are total 9 and 5 kinds technology index. When all the test results are "PASS" (figure 1 shows) said the wiring system complies with the Category5Cable transmission technology requirements.

If the test process, problems, we can from the following several aspects analysis, then 11 trouble-shooting.

(1) the proximal crosstalk not through the fault reasons may be proximal connection problem, or because of, of external disturbance, remote connection circuit, link cables and connection hardware performance problems, not the same kind of product and cable termination quality problem, etc.

(2) not through the fault reasons may hook on both ends of the joint is a breakers, short-circuit, cross or rupture, or because jumper error, etc.

(3) not through the fault reasons may attenuation is cable is too long or temperature is too high, or connection problem, also may be link cables and connection hardware performance problems, or is not the same kind product, and perhaps the cable termination quality problem.

(4) by failure causes length is not too long, may be cable or short circuit, or equipment open jumper attachment and spend long commissioners.

(5) fault fault reasons may be tester tester don't start (can use replacement battery or charging method to solve this problem), tester can't work or cannot undertake distal calibration, tester is set to not correct cable type, tester is set to incorrect link structure, tester can't storage automatic test results and tester can't print storage automatic test results, etc.

2. The fiber optic transmission channels testing

Although fiber kinds and more, but fiber transmission system is approximately the same as the basic testing methods used by testing instruments, basically the same also.

Then on the grinding fiber or optical fiber transmission system, optical fiber property test must be carried out with optical fiber transmission channels testing standards. The basic tests included continuity and attenuation/loss, optical power input and output power, analysis the attenuation/loss and optical fiber continuity and happened to determine the parts etc. Light loss The actual test also include cable length and delay, etc. Optical fiber testing index is mainly attenuation, if attenuation within the standard for "PASS", vice for "be". If the test fiber appeared in the process of some problems, we need to examine whether correctly, optical fiber mill after whether one-to-one fiber head.

Wiring is invest for the future, so wiring must have advanced consciousness, especially emphasize wiring quality, because wiring will have a direct impact on the network can work normally. Wiring test is to ensure the normal working indispensable network, only a "threshold" by strict test, the network system will put into operation.