hancock4@bbs.cpcn.com 18 Aug 2005 09:41:09 -0700

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The Western Union Technical Review had an article describing how they utilized four-wire connections for voice conference calls to suppress echos. A notable feature was that the four wires apparently went all the way to the subscriber set. Another features was that conference calls were set up automatically by dialing various codes. They used an Ericsson crossbar switch on the WU voice network. Fall 1968. The article goes into considerable technical detail. See: http://massis.lcs.mit.edu/telecom-archives/archives/technical/western-union-tech-review/22-4/p144.htm

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