This diagram shows the following, in interconnected sections from left to right:
An Email network, encompassing: External storage devices; RAC storage for Email, Files and UltraSearch; infrastructure RAC for Portal and Directory; infrastructure non-RAC for Single Sign-On; clustered database servers for Email and Files; a middle tier for Web Cache; a middle tier for Web protocols; a middle tier for Email protocols and services, and Portal and Wireless services; a middle tier for Files protocols and services, and Portal, Wireless and UltraSearch services; a middle tier for Calendar, Portal and Wireless services; and a middle tier dedicated to Portal, Wireless and UltraSearch services. This network is shown to be accessible by land lines, mobile phones and fax through PBX and a CT server.
An intranet, linked to the Email network across a load balancer and encompassing clients for IMAP4, POP3, MAPI and the Web. The intranet can be connected to using PPP dialup and a Radius server.
A Demilitarized Zone, linked to the intranet across a firewall and encompassing: an SMTP gateway linked to External SMTP servers through another firewall; Web Cache, linked to external Web clients through another firewall.