The Open APN defines the architecture of network infrastructure that creates direct optical communication paths among communication endpoints and enables end-to-end communication with deterministic performance.

Part-I of this series of documents describes introduction with needs and goals, services, and high-level architecture of Open APN.

Part-II describes Control and Management plane, and User plane references of Open APN. This part shows detailed information of Open APN including functions, network design, and operation.

Part-III provides Annexes. Each Annex provides a detailed description of Open APN Functional Architecture with focusing on a specific aspect, as well as additional information.

This series of documents supersedes Open APN Functional Architecture Release 2.