# 3rd task 01.08.22 the OAI itself consisted of DU and CU if you look at the following figure:
###### tags: `Internship 2nd level`


**Resources:**
- [OAI 5G Standalone Mode](https://www.youtube.com/watch?v=2ScsJfnvLd0)
- [NSA and SA developments](https://www.youtube.com/watch?v=hSEANp5x0k8)
- [OAI 5G RAN PROJECT GROUP](https://openairinterface.org/oai-5g-ran-project/)
- [TESTING_5GSA_setup.md](https://gitlab.eurecom.fr/oai/openairinterface5g/-/blob/develop/doc/TESTING_5GSA_setup.md)
- [What is CU and DU in 5G](https://www.5gworldpro.com/5g-knowledge/what-is-cu-and-du-in-5g.html)

# The sketch to compare the architecture of OAI gNB (CU/DU mode) versus O-RAN gNB.


OAI gNB uses Fronthaul compare to O-RAN gNB which uses Fronthaul O-FH. Both of them uses own logical nodes which also different, you can see it on the scetch.
Another comparison is FlexRIC. FlexRIC integrate with OAI’s 5G cellular radio stack. For O-RAN, FlexRIC E2-agent compatibility with the O-RAN RIC.
Meanwhile, they both uses F1 interfaces , which includes F1-C - control plane and F1-U - user plane, for connection CU to DU for OAI and O-CU to O-DU for O-RAN