This site recreates the hardware device as a virtual machine. Each demo explores a different facet of classic exchange switching systems. 

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Some of the recorded dialog may ask you to press physical control buttons ("D" buttons, others). These controls are for in-person demos only. For this website, all control is done using the on-page control buttons. The buttons you will see in the videos are not responsive in this setting. This will be clear once you try a demo. 

 

Some dialog mentions a "Companion Booklet" and its contents are mostly recreated on the Motivation and Systems pages herein. Select a demo below and give it a try!