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Each of a subsystem's components resides in one of the three main tiers, and can be identified by one or
more Java Interfaces that they implement.
6.2.5 OPEN-O

OPEN-O is a Linux Foundation Collaborative Project aiming to build an open source, carrier grade
orchestration platform. The primary goal of OPEN-O is to establish an open framework to orchestrate end-
to-end composite services across legacy networks, along with emerging SDN/NFV infrastructure. Operators
can significantly improve service agility and velocity to increase revenues through OPEN-O, while
simultaneously reducing the overall costs.

Figure 6.2.5-1 – OPEN-O Architecture

The OPEN-O has proposed an architecture which is aligned with the ETSI NFV Architecture Framework and
Management and Orchestration (MANO). OPEN-O consists of a hierarchy of 3 orchestration modules:
• Global Service-O-(GS-O): service-level functional block that enables end-to-end service composition
and delivery.
• NFV-O: Responsible for NFV orchestration for diverse Virtualized Network Functions (VNFs) across
a wide range of VNF Managers (VNFMs) and Virtual Infrastructure Managers (VIMs).

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