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.. SPDX-License-Identifier: CC-BY-4.0
.. Copyright 2022 Nordix Foundation
Consumed APIs
=============
The A1 Policy Management Service consumes two ONAP APIs and the A1-P API.
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O-RAN A1 Interface for A1 Policies (A1-P)
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Southbound, the ONAP A1 Policy functions communicate with *near-RT-RIC* RAN functions using the **A1** interface, as defined by the `O-RAN Alliance <https://www.o-ran.org>`_
The *A1 Interface - Application Protocol Specification (A1-AP)* describes this interface. The specification can be viewed from the `O-RAN Alliance <https://www.o-ran.org>`_ website.
The **Kohn** ONAP A1 Policy functions implement the *A1 Policy* parts (*A1-P*) of A1-AP versions *v1.1*, *v2.0* and *v3.0*
An opensource implementation of a `near-RT-RIC <https://wiki.o-ran-sc.org/pages/viewpage.action?pageId=1179659>`_ is available from the `O-RAN Software Community <https://o-ran-sc.org>`_. It supports a pre-spec version of the A1-AP. The ONAP A1 Policy functions described here also supports this A1 version (*A1-OSC*).
An opensource implementation of an `A1 Simulator <https://wiki.o-ran-sc.org/pages/viewpage.action?pageId=3604819>`_ is also available from the `O-RAN Software Community <https://o-ran-sc.org>`_. It supports all versions of A1-AP.
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