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Building Intercom System Details Main Components: · Outdoor Main Unit (or Door Station): Used for communication with visitors and controlling access. · Indoor Extension (or Indoor Unit): Used for receiving visitor information and internal communication. · Power Supply: Provides the necessary power for the system. · Controller (if any): Coordinates the operation of various components. · Access Controller (if any): Controls door locks or electromagnetic locks. Wiring Plan Planning the Wiring Path: · Path Selection: Determine the wiring path from the main unit to each extension, avoiding crossing cables and high-current cables to prevent interference.