n-user

In the ISO Open Systems Interconnection–Reference Model (OSI–RM), an n+1 entity that uses the services of the n-layer, and below, to communicate with another n+1 entity. Note: If n identifies a specific or a reference level, the n+1 layer is the layer above the n layer and the n-1 layer is the layer below the n layer. Thus, the n+2 layer is two layers above the n layer.