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Why do residential access control need the signal support of face recognition?

Face recognition access control system and access control need to be connected through the network. According to Taobao's query, the face recognition access control system is that the controller and the management center transmit data through the local area network and connect with the gateway through the network. The access control system transmits the recognized face information to the gateway through the network, and the gateway controls the opening of the gateway according to the verification result. Without signal support, the gateway cannot be opened.