An information technology architecture is a detailed description of the various information processing assets needed to meet business objectives, the rules that govern them, and the information associated with them. It affects three levels within an organization, including the server, middleware, and client.
Preliminary research was directed at exploring diagrams of IT architecture. Though options were extremely limited, only IT diagrams were obtained at various platforms (links provided in the reference sections).
Here are some basic guide references showing IT architecture design diagrams:
Weblinks showing some architecture templates: