Total Network Data System: Theoretical and engineering foundations

The Total Network Data System (TNDS) is a coordinated family of computer-based systems that collect and process network measurements to aid the engineers, administrators, and managers of the Bell System network in efficiently meeting service objectives. This paper describes these service objectives, the nature of telephone traffic and traffic measurements, and the theories and engineering assumptions underlying the use of these measurements in the design and administration of the trunk network and switching systems.