Network Diagnostic Systems Pacific Bell  Pacific Bell has developed a set of EXSYS expert systems, running on an AT&T 3B2/600 computer, to monitor the LMOS (Loop Maintenance Operating System) front end computers which serve as a transaction manager for an IBM mainframe. The software performs three functions - monitoring, repair assistance and problem prediction.  Monitoring: The MONITOR software constantly monitors LMOS' integrity and checks for errors. If an error is detected, it announces the error to system data specialists through the public address system using synthesized voice created with a DECtalk. With MONITOR, the data specialists can perform other work and be confident that if there is a problem developing, the system will detect it and immediately call them through the public address system.  Repair: Once the problem has been detected, the CONSULTANT expert software can be used to walk support personnel through troubleshooting / repair procedures to correct the problem and prevent the system from going down. CONSULTANT has expertise in over 12 subject areas. Printed repair recommendations are provided to the user. Prior to the implementation of the software, troubleshooting had to be performed by a limited number of highly trained staff. Now, with expert system assistance, many more people can accurately determine the cause of the problem and correct it.  Prediction: In addition to the monitoring function, there is another EXSYS application named FORCASTER that checks the system files and notifies personnel of impending problems, even before they generate error messages. The expert system logs onto the network to get data and monitor for suspicious trends in file structure, resource allocation, error messages, etc., which could be warning signs of a serious problem. FORCASTER allows potential problems to be corrected before they turn into emergencies. Prior to implementation of this application, this type of monitoring was not practical.  The LMOS expert systems were developed in 11 months by a team with maximum staffing of 4. They have improved productivity and reduced down time. The system has won an award for an Innovative Use of AI.  Pacific Bell has also fielded another EXSYS application for network assistance. NetHELP is an expert system that provides assistance to the users of the Netway network. When a user is having problems with the network, they can call the expert system. The system asks the user questions about the current state of their network and suggests appropriate repair strategies. If the problem requires repair procedures not appropriate for the user, the system automatically issues a "trouble indication number" for the user to refer to and it notifies the appropriate agency to correct the problem. The system provides a 24 hour per day uniform method of correcting or reporting problems within the network. This system was so successful that Pacific Bell sold it back to Netway, the company that developed and markets the Netway network.  Copyright ©1997 MultiLogic