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- NC (Normally Closed): An action where the relay remains closed in normal status but opens when the device operates. The current flows through the connected circuit because the relay remained closed earlier.
- NO (Normally Open): An action where the relay remains open in normal status but closes when the device operates. The current does not flow through the circuit because the relay remained open earlier.
- NVR(Network Video Record): A function that records and monitors videos of access points using cameras or video devices installed on the network, and manages events that occur.
- Noise: The electrical signals that obscure or make it difficult to identify signals.