Questions · Access control
Who really decides whether the door opens?
The controller on the wall, inside the protected area. The reader only reads the credential and passes it on; the server is where the people, the permissions and the log exist, but it is not in the path of the decision.
That is what makes the doors carry on working when the network goes down: the controller has its copy of who may pass and on what schedule downloaded, it decides in tenths of a second and stores the events until the line comes back. It is also the reason the controller never goes on the outside face of the door: whoever reaches it, opens it.
There is a variant worth knowing about: standalone or intelligent readers, which carry the list inside and decide themselves. They fit small installations and stray doors, and they have two costs. One, that the electronics doing the deciding is on the insecure side, within reach of a screwdriver, unless the manufacturer has separated that part. And two, that the list has to be maintained at every door, which works fine with six doors and terribly with sixty.
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A written answer is enough to decide whether it interests you. To know whether it works at your site you have to see it on a real scene, with the image as it is and, on top of it, what the system understands from it. That is on the IRIS Neural website, which is the group's product.