Low-level architecture focuses on specifying the processes and standards you use to build your portal solution, and specifying the actual hardware and software components of the solution, including:
The Portal Server complex of servers.
Network connectivity, describing how the portal complex attaches to the “outside world.” Within this topic, you need to take into account security issues, protocols, speeds, and connections to other applications or remote sites.
Information architecture, including user interfaces, content presentation and organization, data sources, and feeds.
Access Manager architecture, including the strategy and design of organizations, suborganizations, roles, groups, and users, which is critical to long-term success.
Integration strategy, including how the portal acts as an integration point for consolidating and integrating various information, and bringing people together in new ways.