The evil minibar billing system

A few years ago, in the not too distant past (mid-1990s), I went on digital switch training that was certified by Bell Labs. A digital switch is an ISDN based switch that aggregates and distributes basic and primary rate telecommunication interfaces. It was the replacement for analogue and was in demand for video conferencing equipment. 

Read the article here on LinkedIn's Pulse.

https://www.linkedin.com/pulse/my-top-10-posts-pulse-ronald-bartels/

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