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Planning high-speed digital services in the Bell system

High-speed digital transport has been an integral part of the Bell Network since the introduction of T1 facilities in the early 1960s. Since that time a growing percentage of short- and long-haul digital facilities have been integrated into the network via various technologies such as digital radio, coax, and fiber. More recently, customer needs for data communications have required the extension of high-speed digital transport to the customer premises.
 This paper discusses the growth of high-speed digital services. We describe the customer applications that led to the requirement for such transport, the technological environment, and finally some near-term and longer-term plans for high-speed transport capabilities.