In order to facilitate an accelerated development and deployment of the ADaaS concept, MUAC offers the OpenATM service definition describing an open service interface that can be implemented in various multi-vendor scenarios. The current operational MUAC FDPS-CWP interface has been used as a starting point; based on good engineering practices its implementation already accommodates an interface between a data centre and an OPS room using different technologies and manufactured by different suppliers. Additionally, its interface design rationale has not changed since its inception, but has proven in practice that a continuous and flexible extension of its payload contents is possible; thereby not only demonstrating the feasibility to define services, but also demonstrate its maturity and the many aspects needed for commissioning of such services (e.g. performance, safety, security, etc.).