Bell No. 1 ESS

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Switching center of the type 1ASS from the late 1970s

The Bell No.1 Electronic Switching System (1ESS) is the first regularly used switching center for telecommunications that was purely memory-programmed. 1ESS was first put into operation in 1965 in Succasunna, NJ , USA.

1ESS uses a redundant central processor in Harvard architecture . Since then, telecommunications services can be programmed flexibly.

The compatible successor system was the 1ASS with a faster processor and a more compact structure than the previous system. 1ASS was introduced in 1976.

The last # 1 ESS exchange in the United States of America was in Odessa (Texas) and was converted to a VoIP-based system on June 17, 2017. It was in operation for 43 years.

Individual evidence

  1. ↑ Ketchledge RW. "The No.1 Electronic Switching System" IEEE transactions on communication technology, Vol 13 No. 1, March 1965, 38-41.
  2. ↑ Tuomenoska LS, Ulrich W .: "Problems of Programming for Shared Real-Time Systems" IEEE transactions on communication technology, Vol. 15 No. 1, Feb. 1967, 5-10
  3. ↑ 1A Processor , Bell System Technical Journal, 56 (2), 119 (February 1977)
  4. ↑ Nokia OnLine Customer Support (OLCS) - 1AESS ( Memento from October 4, 2016 in the Internet Archive )