Common-network interface ring
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, offices, and most of the wireline 5ESS offices.
- US Patent 5592466 – Network interconnect backup
- "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