On-line Monitoring System For PSTN Cable Breakdown Fault

With the development in the economy, the requirement of communication is increasing rapidly. Transmission lines influence the communication effect directly. In this thesis, an on-line monitoring system is brought forward to check and measure breakdown fault of PSTN cable. With the understanding of existing measurement, the system can achieve functions, both fault-alarm and fault-location.Designing of whole monitoring system is expatiated completely in this thesis. On the central computer, VB is employed as the programming tool for manipulative software. The software can accomplish the distributed MCU's controlling and data's acquiring by using the MSComm ActiveX control. And the distributed MCU system is made up of two parts: the high and alterable speed sampling system achieved by using MCU and FPGA, and the remote alarming and data exchanging module consisted of a monolithic DTMF transceiver and a monolithic MODEM. The all above achieve the functions of distributed on-line monitoring system. The whole system is flexible, extensible and easy to be controlled. It's valuable to deal with the PSTN cable breakdown fault in time and valuable to reduce the economic loss caused by the fault.First, the measurement is introduced, then the distributed MCU system is explained in detail, including both hardware and software's design. At last the functions of the central computer are given.