Access control systems get their orders from a central server to allow or limit Entry and exit of personnel. In this case, all systems get the same order form main server.
The traffic control gate is one solution that can store information received from the server in its internal memory. In This method, when some issues occurred as power outage or interruption of the network and failure to connect to the server the gate can manage traffic with pre-stored information.
These types of gateways control all stages of the request for traffic until the full state of the person's traffic is complete, and if there was any problem, they send a report to the central server.