Abstract: In thiS work, we present the framework of an expert system that will be capable of diagnosing and predicting faults in a cable television plant. The structure of the diagnostic expert system under development comprises equipment specific and network specific parts. For the equipment specific part, there exist well established diagnosis and calibration procedures. These are captured and integrated into an equipment specific knowledge based diagnosis system with the aid of specifically designed knowledge acquisition system. The network Itself iS monitored in real time, and its status data are used to determine failure points and the likely cause of the failure.