No. 4 ESS: Prologue

  title={No. 4 ESS: Prologue},
  author={A. E. Spencer},
  journal={The Bell System Technical Journal},
  • A. Spencer
  • Published 1 September 1977
  • History
  • The Bell System Technical Journal
No. 4 ESS, a high-capacity, toll and tandem switching system, is the largest single system development ever undertaken by the Bell System. It is also the vehicle by which electronic switching was first introduced into the Bell System long distance telecommunications network. During 1976, four No. 4 ESS offices were placed in service the first in Chicago in January, the second in Kansas City in July, and the third and fourth in Jacksonville and Dallas in December. 
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