Tang Daibing:
Guangdong wisdom security expert library expert
Qualified Internal Auditor of Enterprise Intellectual Property Management System
Chief technical expert of joint research and development of Wuhan University of Engineering
Participated in the declaration of various science and technology projects in Guangdong Province and Guangzhou City
Hubei Province Enterprise Intellectual Property Management System Demonstration Enterprise Reporter
Participated in the declaration of “High-tech Enterprise Certification†in Guangdong Province and Hubei Province and was approved
Participated in the "White Paper on Application Technology of Indoor Intelligent Wiring System in Buildings" of the Ministry of Housing and Urban-Rural Development
Participated in the technical preparation of many standards such as the GA/T1297-2016 "Security Cable" standard of the Ministry of Public Security
Quality Management System and Environmental Management System Certificate
Wire and cable product testing advanced skills professional qualification certificate
20 authorized utility model patent inventors
7 invention patent applicants
Person in charge of qualified quality of wire and cable "production license"
The integrated wiring system test is divided into cable transmission link verification test and cable transmission channel certification test from the engineering point of view. The verification test is carried out by the construction personnel during the construction process to ensure the connection of each component completed. Correctness, this test only pays attention to the connection performance of integrated wiring; certification test refers to the item-by-item inspection of the wiring system according to certain standards to confirm whether the wiring can meet the design requirements. The verification test only pays attention to the connection performance of the integrated wiring. It is mainly to confirm the installation process of the construction workers wearing the cables and connecting the related hardware. The common faults are connection short circuit, open connection, twisted pair wiring diagram error and so on. The certification test pays attention to both the connection performance test and the electrical performance test. The certification test is actually the inspection of the entire integrated wiring project. Through the certification test to confirm whether the installed cable and related connection hardware and installation process meet the design requirements and relevant standards, it is necessary to use the instrument that meets the specific requirements and follow the corresponding test methods to ensure the test results are valid.
Integrated wiring system link test diagram
Integrated wiring system channel test diagram
Guangzhou Yuhong Company has more than 20 sets of domestic and imported advanced digital control digital cable production equipment. The digital communication cable is designed, produced and inspected in accordance with YD/T1019-2013 (polyethylene for digital communication). Insulation level to cable and cable) standard requirements, at the same time, the company to meet the technical requirements of GB/T50312-2016, TIA/EIA-568B.2 for the performance of digital communication cable after construction, purchase the US FLUKE company model is DTX- Two sets of 1800 test instruments, which are currently the most advanced test equipment in the industry, can comprehensively test and analyze the construction connectivity of the integrated wiring system and the effective state of the electrical performance of the system.
System test key technical requirements:
After the end of a wiring project, there is a very important link that is “testingâ€. The test of the integrated wiring system is not only testing a section of cable, but testing the entire connection line, including modules, cables, patch panels, jumpers, and so on. In the integrated wiring system acceptance procedure, the test report has a very important weight. It not only determines whether the integrated wiring system is finally acceptable, but also can feed back the electrical performance of the entire link.
In the system acceptance, the analysis of the test report is very important, the most important thing is to understand the meaning of the instrument related test, the following describes the FLUKE test instrument DTX-1800 key test parameter definition.
1, Insertion Loss: Insertion loss refers to the loss of load power that occurs somewhere in the transmission system due to the insertion of components or devices. It represents the power and insertion received on the load before the component or device is inserted. After the ratio of the power received in the same load in dB, the smaller the insertion loss value, the better.
As shown in the figure, the greater the distance between the test result and the limit value (red line) in the figure, the better. When approaching the critical point of the limit value, the FLUKE test instrument corresponding item will be displayed!
2. Near-end crosstalk (NEXT): is the most important criterion for evaluating performance. A high-speed network is synchronized when transmitting and receiving data, and NEXT is an interference signal generated when transmission and reception are performed simultaneously. The NEXT unit is dB, which represents the ratio between the transmitted signal and the crosstalk signal. Therefore, the larger the test value of the near-end crosstalk, the better.
The larger the distance between the test result and the limit value (red line) in the figure, the better. When approaching the critical point of the limit value, the FLUKE test instrument corresponding item will be displayed!
3, near-end crosstalk attenuation power and (PSNEXT): is calculated by the formula on the basis of the NEXT effect of each pair of lines from the other three pairs of lines, the unit is dB, the same is the larger the test value, the better. .
The larger the distance between the test result and the limit value (red line) in the figure, the better. When approaching the critical point of the limit value, the FLUKE test instrument corresponding item will be displayed!
4. Attenuation crosstalk ratio (ACR): Actually, the difference between the signal from the far-end attenuation and the crosstalk noise, the unit is dB, and the difference is the greater the ACR value.
The larger the distance between the test result and the limit value (red line) in the figure, the better. When approaching the critical point of the limit value, the FLUKE test instrument corresponding item will be displayed!
5, return loss (RL): also known as reflection loss. It is the reflection of the cable link due to impedance mismatch, which is the reflection of a pair of wires themselves. The mismatch occurs mainly in the connector, but it may also occur in the cable where the characteristic impedance changes, so the quality of the construction is the key to improving the return loss. The unit is dB, and the larger the return loss test value, the better.
The larger the distance between the test result and the limit value (red line) in the figure, the better. When approaching the critical point of the limit value, the FLUKE test instrument corresponding item will be displayed!
Indicators that should be followed by the test report:
The important performance indicators we should focus on in the engineering test report are insertion loss, near-end crosstalk, and return loss. Insertion loss and near-end crosstalk are the two main indicators of system transmission. The passage of insertion loss is equivalent to the difference between expressway and ordinary highway. The test is the expressway, otherwise it is the ordinary highway. Is the margin of insertion loss larger the better? No, the insertion loss indicator reaches the standard, which is the expressway, and the margin does not affect the quality of the expressway. However, the near-end crosstalk is different. The near-end crosstalk is equivalent to the lane of the expressway. The larger the margin, the more lanes, and the more vehicles there are, the faster the speed. Therefore, in ensuring the insertion loss, the return loss is passed, and the worst-case crosstalk of the near-end crosstalk is an important criterion for selecting the system.
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