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Definition - What does Network-to-Network Interface (NNI) mean? A network-to-network interface (NNI) is a physical interface that connects two or more networks and defines inter signaling and management processes. It enables the linking of networks using signaling, Internet Protocol (IP) or Asynchronous Transfer Mode (ATM) networks. A network-to-network interface is also known as a network node interface (NNI).
The âNâ stands for âNegativeâ and the âPâ stands for âPositiveâ. With respect to sensors, an NPN device is one that can switch the negative side of the circuit while a PNP device switches the positive side.PN and PNP are technical terms for the type of transistor used to switch the output. The type of transistor determines the direction of current flow. For additional information about NPN-PNP devices, connections, and working with PLCâs check out the following from the Industrial Electrical and Maintenance forum.