Research On And Implementation Of Ethernet Cable Test For IP Network Tester

In recent years, with the popularity of Internet growing quickly, the requirement on the quality of network has been becoming more and more rigorous. So, it is more and more important to research on the performance measurement of Internet. Internet services provider and the users urgently need a measurement device to monitor the network status and locate the position of network fault.Firstly, the design of the hardware platform of the embedded probe based on the DNMAI is described in detail. Secondly, the method to build basic probe software platform is given, with which a special bootloader, the embedded Linux operating system and cramfs file system are developed. Thirdly, the cable test module of the probe is designed, with the emphasis on the technology of detecting the location of the fault point in the network cable based on TDR(Time Domain Reflectometry). Fourthly, based on the analysis of transmission line theory and characteristics of the electromagnetic wave in the twisted line, a method is proposed with which a wider pulse with more energy is sent to the end, and the cable fault location module is implemented. The test results show the method is available. Finally, the whole paper is summarized and some problems that worth considering are pointed out.