Our “network architectures” for access control are optimized differently than for HVAC. We are much more database oriented, and that, too, has provided a better synergy with the IT department. We have controllers with databases for “Who goes where, when.” These controller databases are downloaded from a server and operate locally, even if the server halfway around the world is down or otherwise unavailable.
However, we have a separate database in the server that contains lots of text (names, departments, vehicles, phone numbers, etc.), images (photos, signatures, and logos), biometric templates, and video (time-stamped digital video recorder clips). Sure, we download some sophisticated application logic (control sequences) into our controllers for local control, and we absolutely need operators to respond to alarms and manually unlock doors in real time. But most of what we do is about “data,” very secure data.