Common-network interface ring

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The common-network interface ring (CNI ring) provides common-channel signaling (CCS) functionality on several Alcatel-Lucent SS7 products. It was introduced by Western Electric in the early 1980s but is still used today in all 1AESS and 4ESS,[1] offices, and most of the wireline 5ESS offices.[2]

It was designed and manufactured at the combined Bell LabsWECo location in Columbus Ohio.


  1. ^ US Patent 5592466 – Network interconnect backup
  2. ^ "Common channel signaling in the AT&T US 5ESS switch" Brown, R.B., Jr.; Holmes, C.V.; Lanoux, M.D.; Marciani, T.P. Proceedings of the IEEE, Volume 80, Issue 4, Apr 1992, pp. 618–627