The DDSN: On Line in the United Kingdom (9-1)

At 14:00 hours on 7 November 1988, the progressive state of worldwide network intelligence took a big, if quiet, step forward. On that date, British Telecom's Digital Derived Services Network (DDSN) cut over into live service. What began then was culminated in mid-1989 when the DDSN centralized database went `livee`, thereby initiating the first Intelligent Network (IN) service - Advanced Freephone - outside North America. This paper describes how the DDSN - an `early` IN - progressed from a product concept to a fully-deployed network.