Teletypewriter loop switching matrix

摘要

A system for interconnecting and switching teletypewriter or digital data signals when transmitted over any of the four universally accepted standard signal loops. The system incorporates a novel triple loop arrangement; an "IN" loop connected to a signal source, an "INTERNAL" loop to provide switching and an "OUT" loop connected to the signal destination. Each "IN" loop or "OUT" loop together with half of its associated "INTERNAL" loop is implemented in a single printed circuit card. The system can incorporate any number of "IN" and "OUT" loops and the associated "INTERNAL" loops.