Network Software is depicted in Figure below, additionally reflecting the O-RAN functional partitioning into O-RU (Radio Unit), O-DU (Distributed Unit),  and O-CU (Centralized Unit) and RIC (RAN Intelligent Controller).

Network Software is a central part of cloud-native, virtualized networking solutions.The Network Software consists of the following product groups:

1. gNodeB, being part of the Software-Defined RAN (SD-RAN), is a 3GPP-compliant implementation of the 5G-NR base station.
2. eNodeB, being part of the Software-Defined RAN (SD-RAN), is a 3GPP-compliant implementation of the 4G LTE base station.
3. RIC (RAN Intelligent Controller (RIC), is a proprietary implementation of an O-RAN compliant radio access network SDN controller. It is accompanied by a library of applications realizing chosen telecom functions (xAPPs).
4. Core is a basic 3GPP compliant core network functionality covering both 4G, as well as 5G (Non-stand Alone and Stand Alone).
5. MANO is a Management and Orchestration software aligned with ETSI NFV (Network Function Virtualization) concept.

All network functionalities are provided as a set of Virtual Network Functions (VNFs). They are not only disaggregated at the level of hardware-software separation but also are highly granularized so that can be easily used independently. Such freedom implemented from the start, allows IS-Wireless Network Software to support any possible split and use of any computing resources. This is depicted in the figure below, which also summarizes the roles of software modules. gNodeB and eNodeB are composed of 3GPP Stack and Virtualization Component (VC). 3GPP Stack is a 3GPP compliant implementation of 4G and 5G protocols stack. VC provides a set of libraries for managing computationally intense, Real-Time VNFs of the RAN protocols. 3GPP Stack and VC implementing 4G LTE correspond to eNodeB, while 3GPP Stack and VC implementing 5G-NR correspond to gNodeB.