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The first system actually used at Bell Labs was BESYS-2. The system was resident on magnetic tape , and occupied the lowest 64 (36-bit) words and the highest 4K words of memory. The upper 4K words held the resident portion of the monitor, and could be partially swapped to magnetic drum to free up additional core for the user program if needed.
In Bell System telephone exchanges, particularly the 5XB switches, information from the marker told the sender that the call required ANI, and stored the calling equipment number in reed relay packs in the sender. The sender used the transverter connector (TVC) to seize a transverter (TV), which was a bay of a few hundred flat spring relays ...
AT&T Information Systems (ATTIS), originally known as American Bell, was the fully separate subsidiary of American Telephone & Telegraph Company (AT&T) which focused on computer technology ventures and telephone sales, and other unregulated business. It was one of the three core units of AT&T formed after the breakup of the Bell System.
AT&T Computer Systems (abbreviated AT&T-CS) was the home of the UNIX System V operating system, originally developed in the Bell Labs Research Division. The important System V Interface Definition (SVID) was written, attempting to standardize the various flavors of Unix , and define the official interfaces which made up a Unix operating system.
A typical volume of Bell System Practices from the 1970s. The Bell System Practices (BSPs) is a compilation of technical publications which describes the best methods of engineering, constructing, installing, and maintaining the telephone plant of the Bell System under direction of AT&T and Bell Telephone Laboratories. [1]
The Bell System Technical Journal was published by AT&T in New York City through its Information Department, on behalf of Western Electric Company and the Associated Companies of the Bell System. [1] The first issue was released in July 1922, under the editorship of R. W. King and an eight-member editorial board.
The Fall of the Bell System A Study in Prices and Politics (1987) Watzinger, Martin, and Monika Schnitzer. "The breakup of the Bell System and its impact on US innovation." (2022). online; White, Lawrence J. "US telephone deregulation: lessons to be learned, mistakes to be avoided." Japan and the World Economy 12.2 (2000): 173-183. online}
The purpose of this OSS and communications application was to transport customer billing information from switching systems to a centralized computer that serves as a repository for billing data. Nearly all wireline and wireless telecommunications companies utilize similar technologies today to transport near-real-time billing information.