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The '''Common Network Interface (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]],<ref>[http://www.patentstorm.us/patents/5592466/description.html US Patent 5592466 - Network interconnect backup]</ref> offices, and most of the wireline [[5ESS]]<ref>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
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