Network Operator Network Operator – an operator of an electronics communications network or part thereof. An association or organization of such network operators also falls within this category. As defined by Network Functions Virtualization (NFV) ETSI Industry Specification Group (ISG) in the Network Functions Virtualisation (NFV); Terminology for Main Concepts in NFV For more information check out: What is NFV? Which is better NFV or SDN? Why SDN or NFV Now? Who is ETSI?