A small automatic teletypewriter switching system

Two teletypewriter selective calling line systems, the TADS (Teletypewriter Automatic Dispatch System) system1 and the 83B1 system,2 have been described in recent papers. These systems are for single multistation lines; those in service at the present time have an average of about ten stations on a line although, theoretically, if the traffic offered per station is low, there may be as many as 40 stations on a line. As soon as the required number of stations exceeds that which can be efficiently handled on one line, other lines are required, with the need for transferring messages from one line to another.