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Centrex is a portmanteau of central exchange, a kind of telephone exchange. It provides functions similar to a PBX, but is provisioned with equipment owned by, and located at, the telephone company premises. [1] Centrex service was first installed in the early 1960s in New York's financial district by New York Telephone.
The Combined Enterprise Regional Information Exchange System (CENTRIXS) is a collection of classified coalition networks, called enclaves, that enable information sharing through the use of email and Web services, instant messaging or chat, the Common Operational Picture service, and Voice over IP.
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From the 1960s, a simulated PBX, known as Centrex, provided similar features from the central telephone exchange. A PBX differs from a key telephone system (KTS) in that users of a key system manually select their own outgoing lines on special telephone sets that control buttons for this purpose, while PBXs select the outgoing line ...
Each vertical group is divided into five vertical files of ten lines, important because class of service, or customer group identification in later Centrex offices, is shared by all ten lines in the vertical file. Staff in Centrex offices spent much time standing on ladders, rewiring the Class of Service data fields at the top of LLF.