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SSII was an unusual web architecture in which all of the "N-tiers" were implemented on a single laptop. |
The goal of the SSII project was to create a laptop-based data collection and display platform with an easy-to-use web interface. This laptop was used to monitor sensors connected to a packet-radio network as part of a mobile security system. Being mobile, it needed to be easily reconfigurable for new areas, new sensors, and new users, so everything can be configured from a browser-based interface, including positioning "push-pins" for known map features. There were many other features to this system, like saving the collected data for later replay and customizable filtering and alarm thresholds.
This solution was somewhat unique for a web-based architecture. Even though there was limited computing power available on the laptop, we were still able to build a multi-tier web architecture onto this single platform. We did have to compromise by using less than "enterprise-level" products, most of them from Microsoft, with our solution being built on Win 95. We used IE 4 as the user interface and MS Access as the database. The bulk of the processing was done by the Personal Web Server (PWS) with Active Server Pages, HTML & Javascript. We also wrote some Visual Basic to perform the data collection -- which was the business layer in this "web" application.The diagram at the left is a systems-level diagram for the SSII laptop.
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