Common-network interface ring explained

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 Labs–WECo location in Columbus, Ohio.

Notes and References

  1. http://www.patentstorm.us/patents/5592466/description.html US Patent 5592466 – Network interconnect backup
  2. 10.1109/5.135384. Common channel signaling in the AT&T US 5ESS switch. 1992. Brown. R.B.. Holmes. C.V.. Lanoux. M.D.. Marciani. T.P.. Proceedings of the IEEE. 80. 4. 618–627.

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