Tier 3: The Enterprise Information Services Layer
The third tier in our logical architecture is the enterprise information services or data services layer. This layer of the architecture is the most varied and the one about which we can say the least. It is here where portals and other Web-based applications meet the rest of an organization's information infrastructure. Some of the systems found in this tier include the following:
Relational databases
ERP systems
CRM systems
Sales force automation systems
Document management systems
E-mail systems
Legacy applications
The application server tier is primarily responsible for interfacing with these enterprise components, and together both of these tiers are responsible for transactional integrity and ...
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