基于TDR的ADSL线缆断点测试仪设计

Design of a test instrument for measuring ADSL cable breakpoint based on TDR

介绍一种基于时域脉冲回波(TDR)原理的ADSL线缆断点测试系统。该系统设计以STC单片机为控制核心,以FPGA为测试主体发射接收脉冲,采集脉冲往返线缆时间,实现ADSL线缆断点位置的测量。在分析现有测试产品的基础上,首先阐述设计理论,然后介绍系统总体设计框图、硬件实现、软件测试流程以及系统实际测试结果。实验结果表明该测试仪能够快速准确测试出断点位置,并且只需适当剪切,便可作为内嵌模块应用于其他仪表。

The testing system for measuring ADSL cable breakpoint based on TDR （time domain reflection） is introduced. The system uses STC-MCU as a control core,and FPGA as test main body to transmit and receive pulse,and collects the trip time of pulse in ADSL cable,so that the system realizes the ADSL cable breakpoint measurement.On the basis of analyzing the actuality of the instrument products ,the main design theory is illuminated ,and then the system design diagram, the hardware implementation,the software test flow and the actual test results are introduced.The experiments show that the tester is able to test breakpoint quickly and accurately.Only sheared appropriately, the system design is used in other instruments as an embedded module.