A method and system for managing performance data of communication lines, such as digital subscriber lines, is disclosed. The method includes receiving from a remote user device an identifier for a particular communications line at a web server; initiating a real-time performance analysis of the line at a network end of the line; receiving real-time performance data and converting the real time performance data to analyzed data; receiving field performance data from the user device; and converting at least one of the field performance data and the real-time performance data from a web-based format to a mainframe format; and sending the converted data to a mainframe for storage corresponding to a file associated with the identifier.