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The Circuit-Switched Network Design and Analysis Model: A Chronology of Its Development and Use

The Defense Information System Agency DISA has managerial and engineering responsibility for a circuit-switched network currently known as the Defense Information System Network---Voice. This network was originally implemented in the 1960s and was known as the Automatic Voice Network. Throughout this time, DISA has used a network design and analysis model to reconfigure the network. This model was developed in the early 1970s, has been continually enhanced, and is used on a weekly basis to engineer and manage the network. Since 1975, it has been used to save the United States U.S. government approximately $1,400,000,000.00. In this paper, we present a chronology of its development, enhancement, and use.