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Following this, Mayo joined Bell Labs, now Alcatel-Lucent Bell Labs, (1955) where he first worked on early computers as the Triadic and Leprechaun, the Telstar satellite, ocean sonar systems and various switching systems.
Automatic number identification (ANI) on the NPA's switching systems began transmission on October 11, 1992 for some central office codes, and full conversion was achieved by January 1, 1994.
The family of IBM 1750, 2750 and 3750 Switching Systems was developed from the IBM 1800 by the IBM La Gaude Research Laboratory near Nice, France for European markets only.
Following his graduation from FAU with his bachelor of science degree in electrical engineering, he took a position at Siemens working on software development for telecommunications switching systems.