Tech Website

The OCA Alliance offers a public technical website for OCA product designers and developers at https://ocaalliance.github.io/

AES70 StandardS DOCUMENTS

The public standard specification of OCA is the AES70 standard, published by the Audio Engineering Society, or AES.  The standard is in three documents that are available from the AES Standards office, as follows:

  1. AES70 Framework

Also known as OCF, this specification describes the overall architecture of AES70 and describes its mechanisms.  OCF is published as this AES document (click to go to the AES download page):

AES70-1-2015:  AES standard for Audio applications of networks – Open Control Architecture – Part 1: Framework

  1. AES70 Class Structure

Also known as OCC, this specification describes the object-oriented class structure that defines the functional repertoire (connection management, control, and monitoring) of AES70.  OCC is published as this AES document (click to go to the AES download page):

AES70-2-2015:  AES standard for Audio applications of networks – Open Control Architecture – Part 2: Class structure

Also download Annex A in either of two forms (see below for explanation):

www.aes.org/standards/models/AES70-2-AnnexA-151112-class-structure-1.eap
or
www.aes.org/standards/models/AES70-2-AnnexA-151112-class-structure-1.xmi

  1. AES70 Protocols

Also known as OCP.1, OCP.2, etcetera, these specifications describe protocols that implement OCA control over various types of networks.

In AES70-2015, only one protocol — OCP.1 — is defined.  It is for TCP/IP networks.  Future updates to the standard will define additional protocols.  OCP.1 is published as this AES document (click to go to the AES download page):

AES70-3-2015: AES standard for Audio applications of networks – Open Control Architecture – Part 3: Protocol for TCP/IP Networks

Also download Annex B in either of two forms (see below for explanation):

www.aes.org/standards/models/AES70-3-AnnexB-151112-tcpip-protocol-1.eap
or
www.aes.org/standards/models/AES70-3-AnnexB-151112-tcpip-protocol-1.xmi

Annex UML format

The two annexes listed above are Universal Modeling Language (UML) specifications.  AES70-2 Annex A is particularly important, as it contains the entire specification of the AES70 Class Structure.

The UML files are in two forms:

  • The *.eap files are master files from a UML tool named Enterprise Architect from Sparx Systems. The usual version of the tool costs US$240, but Sparx Systems offers a free viewer, download link here.  There is also a 30-day free trial version of the full package — see the download page here.
  • The *.xmi files are master files in XMI 2.1, a standard format for representation of UML information. XML stands for “XML Metadata Interchange”.  XMI files can be opened by most UML editors, including free ones. See this Wikipedia article for more information.

DOWNLOADS

  1. Oca Microdemo

The OCA Microdemo is a demonstration product developed by OCA Alliance members. Its primary purpose is to prove that OCA can run well in lightweight hardware environments.  The MicroDemo meets minimum requirements for AES70 compliance, and provides a small set of OCA-controlled application functions as well.s

The custom software, finished schematic diagrams, and PC board layouts, for the MicroDemo are publicly available at no charge, on commercially appropriate licensing terms.

Download it here: ocaalliance.com/oca-microdemo-download/

  1. js javascript library

oca.js is a javascript library that supports OCA.  It can be used for building web-based OCA device controllers.  It’s an open-source component developed by OCA Alliance member deusO (aka DeutscheSoft), and is available via te GitHub here:

https://github.com/DeutscheSoft/OCA.js/tree/master

  1. Alliance member downloads

Other OCA downloads are available to Alliance members.  These are mainly software development tools.  Alliance membership information is here:

ocaalliance.com/membership/

Other Resources

  1. OCA Alliance Home

Trade association promoting and evolving AES70.

  1. AES70 in the AES Journal

Comprehensive description of OCA features and mechanisms.

  1. AES SC-02-12, Working Group on Audio Applications of Networks

The AES standards working group responsible for AES70.

Anyone can participate in this group; AES membership is not needed.
A membership application form is
here, or you can just attend a meeting at an AES Convention to join.

Within SC-02-12, the specific task group responsible for AES70 is SC-02-12-L

The AES working group responsible for AES70.

Anyone can participate in this group; AES membership is not needed.
A membership application form is
here, or you can just attend a meeting at an AES Convention to join.