What is Domain in video surveillance systerm

In a video surveillance system, a domain is a physical domain, for example, a campus surveillance system of an enterprise or a social security surveillance system of a city. A domain specifies an independent organization unit. There is a unique authentication and registration management server in a domain. The server is responsible for unified device registration, user login authentication, and direct or indirect camera and surveillance service management. For example, the surveillance platforms of p*** departments in city B and city C are two domains. The management server is called the master server. Servers that are managed by the master server are called slave servers.