Net3 is the name for ETC's current network control protocol system.
Net3 is based on ACN (Architecture for Control Networks). ACN is an ANSI/ESTA international standard; for more technical information see the Wikipedia article on ACN.
Net3 uses ACN for configuration, inter-product communication and error reporting. For transport of level data (DMX-style level information), Net3 uses Streaming ACN, which is a simplified subset of ACN, designed purely to transport DMX type information to simple end devices.