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The Number One Electronic Switching System (1ESS) was the first large-scale stored program control (SPC) telephone exchange or electronic switching system in the Bell System. It was manufactured by Western Electric and first placed into service in Succasunna, New Jersey, in May 1965. The switching fabric was composed of a reed relay matrix controlled by wire spring relays which in turn were controlled by a central processing unit (CPU).

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  • Bell No. 1 ESS
  • Number One Electronic Switching System
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  • Das Bell No.1 Electronic Switching System (1ESS) ist die erste regulär eingesetzte Vermittlungsstelle für Telekommunikation, die rein speicherprogrammiert arbeitete. 1ESS wurde 1965 in Succasunna, N.J., USA erstmals in Betrieb genommen. 1ESS verwendet einen redundanten Zentralprozessor in Harvard-Architektur. Telekommunikationsdienste können seither flexibel programmiert werden. Kompatibles Nachfolgesystem war das 1ASS mit einem schnelleren Prozessor und einen kompakteren Aufbau als das Vorgängersystem. 1ASS wurde 1976 eingeführt.
  • The Number One Electronic Switching System (1ESS) was the first large-scale stored program control (SPC) telephone exchange or electronic switching system in the Bell System. It was manufactured by Western Electric and first placed into service in Succasunna, New Jersey, in May 1965. The switching fabric was composed of a reed relay matrix controlled by wire spring relays which in turn were controlled by a central processing unit (CPU).
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