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1. Nederlands Normalisatie-Instituut2. Network Node Interface: Used in ATM, provides 4096 virtual paths and 65,536 virtual connections within each path--equals up to 268,435,456 channels between two ATM networks, switches, or users--physically connected over a UNI.3. Network-Network Interface: The way a frame relay network interconnects so that users subscribing to different frame relay network providers can communicate.