L5 System: Transmission Networks and Magnetic Components

The development of transmission networks and magnetic components for the L5 system represents the largest network development project of its type ever undertaken within the Bell System. Over 200 different coded designs of networks, requiring in excess of 40 man-years of effort, were required to meet the frequency-selective and signal-shaping requirements of the system. Despite this effort, neither systems requirements nor systems schedules could have been met without significant contributions from allied technologies. This article identifies those technologies and describes design techniques that have advanced the state-of-the-art capabilities in transmission network and magnetic component design.