<s>
The	O
Open	B-Protocol
Control	I-Protocol
Architecture	I-Protocol
(	O
OCA	O
)	O
is	O
a	O
communications	O
protocol	O
architecture	O
for	O
control	O
,	O
monitoring	O
,	O
and	O
connection	O
management	O
of	O
networked	O
audio	O
and	O
video	O
devices	O
.	O
</s>
<s>
The	O
official	O
specification	O
of	O
OCA	O
is	O
the	O
Audio	O
Engineering	O
Society	O
(	O
AES	O
)	O
standard	O
known	O
as	O
AES70-2015	O
,	O
or	O
just	O
AES70	B-Protocol
.	O
</s>
<s>
AES70	B-Protocol
is	O
an	O
open	O
standard	O
that	O
may	O
be	O
used	O
freely	O
,	O
without	O
licenses	O
,	O
fees	O
,	O
or	O
organization	O
memberships	O
.	O
</s>
<s>
AES70	B-Protocol
is	O
intended	O
to	O
support	O
media	O
networks	O
that	O
combine	O
devices	O
from	O
diverse	O
manufacturers	O
.	O
</s>
<s>
Targeted	O
for	O
professional	O
applications	O
,	O
AES70	B-Protocol
is	O
suitable	O
for	O
media	O
networks	O
of	O
2	O
to	O
10,000	O
devices	O
,	O
including	O
networks	O
with	O
mission-critical	O
and/or	O
life-safety	O
roles	O
.	O
</s>
<s>
AES70	B-Protocol
is	O
for	O
device	O
control	O
,	O
monitoring	O
,	O
and	O
connection	O
management	O
only	O
.	O
</s>
<s>
However	O
,	O
AES70	B-Protocol
is	O
designed	O
to	O
work	O
with	O
virtually	O
any	O
media	O
transport	O
scheme	O
,	O
as	O
the	O
application	O
requires	O
.	O
</s>
<s>
AES70	B-Protocol
's	O
parts	O
are	O
separable	O
and	O
may	O
be	O
used	O
independently	O
.	O
</s>
<s>
For	O
example	O
,	O
a	O
device	O
may	O
implement	O
AES70	B-Protocol
connection	O
management	O
,	O
but	O
use	O
other	O
means	O
for	O
operational	O
control	O
and	O
monitoring	O
.	O
</s>
<s>
AES70	B-Protocol
is	O
termed	O
an	O
"	O
architecture	O
"	O
because	O
it	O
provides	O
the	O
basis	O
for	O
definition	O
of	O
multiple	O
control	O
protocols	O
.	O
</s>
<s>
An	O
AES70	B-Protocol
application	O
will	O
use	O
whichever	O
AES70	B-Protocol
protocol	O
is	O
appropriate	O
for	O
the	O
communications	O
method	O
available	O
.	O
</s>
<s>
OCA	O
,	O
the	O
architecture	O
of	O
AES70	B-Protocol
,	O
was	O
developed	O
by	O
the	O
OCA	O
Alliance	O
,	O
trade	O
association	O
,	O
beginning	O
in	O
2011	O
.	O
</s>
<s>
AES70	B-Protocol
,	O
the	O
formal	O
standard	O
,	O
was	O
published	O
on	O
January	O
4	O
,	O
2016	O
.	O
</s>
<s>
Today	O
,	O
the	O
OCA	O
Alliance	O
works	O
to	O
develop	O
and	O
enhance	O
the	O
functionality	O
of	O
AES70	B-Protocol
and	O
to	O
promote	O
AES70	B-Protocol
's	O
adoption	O
throughout	O
the	O
professional	O
media	O
systems	O
industry	O
.	O
</s>
<s>
The	O
Alliance	O
promotes	O
understanding	O
and	O
adoption	O
of	O
AES70	B-Protocol
,	O
facilitates	O
the	O
creation	O
of	O
AES70	B-Protocol
implementations	O
and	O
related	O
tools	O
and	O
technologies	O
,	O
and	O
develops	O
future	O
functional	O
enhancements	O
of	O
the	O
AES70	B-Protocol
standard	O
.	O
</s>
<s>
AES70	B-Protocol
defines	O
the	O
control	O
interface	O
that	O
a	O
media	O
device	O
presents	O
to	O
a	O
network	O
to	O
which	O
it	O
is	O
connected	O
.	O
</s>
<s>
Thus	O
,	O
AES70	B-Protocol
is	O
concerned	O
with	O
the	O
representation	O
of	O
device	O
functions	O
in	O
a	O
systematic	O
way	O
,	O
and	O
with	O
the	O
control	O
and	O
monitoring	O
of	O
those	O
functions	O
via	O
a	O
well-defined	O
family	O
of	O
protocols	O
.	O
</s>
<s>
In	O
AES70-compliant	O
networks	O
,	O
controllers	O
use	O
AES70	B-Protocol
protocols	O
to	O
communicate	O
with	O
the	O
devices	O
they	O
control	O
.	O
</s>
<s>
AES70	B-Protocol
defines	O
the	O
control	O
protocol	O
used	O
between	O
controllers	O
and	O
devices	O
;	O
its	O
scope	O
does	O
not	O
extend	O
to	O
cover	O
the	O
design	O
or	O
construction	O
of	O
controllers	O
or	O
their	O
user	O
interfaces	O
.	O
</s>
<s>
AES70	B-Protocol
is	O
intended	O
to	O
be	O
used	O
for	O
professional	O
applications	O
.	O
</s>
<s>
The	O
AES70	B-Protocol
Device	O
Model	O
is	O
the	O
canonical	O
description	O
of	O
the	O
control	O
interface	O
that	O
an	O
AES70-compliant	O
device	O
presents	O
to	O
the	O
network	O
.	O
</s>
<s>
The	O
AES70	B-Protocol
Device	O
Model	O
is	O
object-oriented	O
.	O
</s>
<s>
Using	O
an	O
AES70	B-Protocol
protocol	O
,	O
controllers	O
may	O
access	O
the	O
properties	O
of	O
these	O
objects	O
to	O
perform	O
control	O
,	O
monitoring	O
,	O
and	O
connection	O
management	O
operations	O
.	O
</s>
<s>
If	O
a	O
device	O
correctly	O
implements	O
an	O
AES70	B-Protocol
protocol	O
,	O
it	O
is	O
AES70-compliant	O
.	O
</s>
<s>
AES70	B-Protocol
does	O
not	O
define	O
how	O
that	O
may	O
or	O
should	O
be	O
accomplished	O
.	O
</s>
<s>
Generally	O
speaking	O
,	O
the	O
AES70	B-Protocol
device	O
model	O
tends	O
to	O
differ	O
from	O
device	O
models	O
in	O
other	O
control	O
architectures	O
.	O
</s>
<s>
AES70	B-Protocol
does	O
not	O
presume	O
a	O
hierarchical	O
device	O
structure	O
.	O
</s>
<s>
AES70	B-Protocol
does	O
not	O
predefine	O
specific	O
processing	O
configurations	O
,	O
signal	O
processing	O
modules	O
,	O
device	O
types	O
,	O
or	O
device	O
families	O
.	O
</s>
<s>
AES70	B-Protocol
does	O
not	O
define	O
controller	O
user	O
interfaces	O
or	O
user	O
interface	O
elements	O
.	O
</s>
<s>
AES70	B-Protocol
has	O
strong	O
support	O
for	O
dynamically	O
reconfigurable	O
devices	O
.	O
</s>
<s>
AES70	B-Protocol
offers	O
a	O
strong	O
and	O
transport-agnostic	O
model	O
for	O
connection	O
management	O
.	O
</s>
<s>
AES70	B-Protocol
's	O
repertoire	O
of	O
management	O
and	O
housekeeping	O
functions	O
is	O
relatively	O
rich	O
.	O
</s>
<s>
The	O
AES70	B-Protocol
Class	O
Structure	O
defines	O
a	O
set	O
of	O
classes	O
(	O
"	O
OCA	O
Classes	O
"	O
)	O
that	O
devices	O
may	O
use	O
to	O
instantiate	O
OCA	O
objects	O
.	O
</s>
<s>
As	O
noted	O
above	O
,	O
the	O
AES70	B-Protocol
architecture	O
supports	O
multiple	O
protocols	O
,	O
depending	O
on	O
the	O
nature	O
of	O
the	O
network	O
medium	O
used	O
.	O
</s>
<s>
At	O
present	O
,	O
AES70	B-Protocol
defines	O
one	O
protocol	O
,	O
named	O
OCP.1	O
.	O
</s>
<s>
OCP.1	O
is	O
the	O
AES70	B-Protocol
protocol	O
for	O
TCP/IP	O
networks	O
.	O
</s>
<s>
Future	O
plans	O
include	O
OCP.2	O
,	O
a	O
byte-serial	O
version	O
for	O
USB	B-Protocol
networks	O
,	O
Bluetooth	O
connections	O
,	O
and	O
point-to-point	O
links	O
,	O
and	O
OCP.3	O
,	O
a	O
text	O
version	O
in	O
JSON	B-General_Concept
.	O
</s>
<s>
Each	O
AES70	B-Protocol
protocol	O
defines	O
three	O
kinds	O
of	O
messages	O
,	O
as	O
follows	O
:	O
</s>
<s>
The	O
AES70	B-Protocol
control	O
repertoire	O
covers	O
control	O
,	O
monitoring	O
,	O
and	O
connection	O
management	O
of	O
audio	O
devices	O
.	O
</s>
<s>
AES70	B-Protocol
includes	O
features	O
that	O
allow	O
manufacturers	O
to	O
extend	O
the	O
OCA	O
class	O
structure	O
to	O
address	O
functions	O
not	O
in	O
the	O
standard	O
repertoire	O
.	O
</s>
<s>
Table	O
1	O
summarizes	O
the	O
AES70-2015	O
control	O
repertoire	O
.	O
</s>
<s>
Although	O
AES70	B-Protocol
does	O
not	O
itself	O
provide	O
media	O
transport	O
functions	O
,	O
it	O
is	O
designed	O
to	O
interface	O
with	O
modern	O
media	O
transport	O
standards	O
to	O
control	O
signal	O
routing	O
and	O
other	O
connection	O
setup	O
functions	O
,	O
and	O
to	O
interface	O
with	O
network	O
directory/discovery	O
services	O
.	O
</s>
<s>
In	O
this	O
capacity	O
,	O
AES70	B-Protocol
provides	O
a	O
useful	O
level	O
of	O
abstraction	O
for	O
applications	O
,	O
allowing	O
controllers	O
and	O
devices	O
to	O
use	O
one	O
common	O
software	O
model	O
for	O
managing	O
stream	O
connections	O
of	O
various	O
transport	O
architectures	O
.	O
</s>
<s>
The	O
OCA	O
Alliance	O
defines	O
recommended	O
practices	O
for	O
interfacing	O
AES70	B-Protocol
with	O
various	O
well-known	O
media	O
transport	O
architectures	O
.	O
</s>
<s>
The	O
specification	O
for	O
interfacing	O
AES70	B-Protocol
with	O
a	O
given	O
media	O
transport	O
scheme	O
is	O
called	O
an	O
AES70	B-Protocol
Adaptation	O
.	O
</s>
<s>
AES70	B-Protocol
includes	O
an	O
architectural	O
solution	O
to	O
the	O
problems	O
of	O
control	O
grouping	O
,	O
i.e.	O
</s>
<s>
The	O
AES70	B-Protocol
grouping	O
mechanism	O
provides	O
a	O
basis	O
for	O
such	O
management	O
,	O
for	O
one	O
or	O
many	O
devices	O
.	O
</s>
<s>
AES70	B-Protocol
includes	O
a	O
powerful	O
and	O
general	O
mechanism	O
for	O
applying	O
,	O
storing	O
,	O
recalling	O
,	O
uploading	O
,	O
and	O
downloading	O
sets	O
of	O
operating	O
parameter	O
values	O
.	O
</s>
<s>
AES70	B-Protocol
includes	O
complete	O
support	O
for	O
managing	O
the	O
configurations	O
of	O
reconfigurable	O
DSP	O
devices	O
,	O
i.e.	O
</s>
<s>
For	O
such	O
devices	O
,	O
AES70	B-Protocol
supports	O
creation	O
,	O
configuration	O
,	O
and	O
deletion	O
of	O
signal	O
processing	O
elements	O
and	O
the	O
internal	O
signal	O
paths	O
that	O
connect	O
them	O
.	O
</s>
<s>
AES70	B-Protocol
is	O
designed	O
to	O
support	O
proprietary	O
extensions	O
with	O
maximum	O
compatibility	O
.	O
</s>
<s>
AES70	B-Protocol
devices	O
and	O
controllers	O
will	O
continue	O
to	O
interoperate	O
as	O
AES70	B-Protocol
evolves	O
over	O
the	O
years	O
.	O
</s>
<s>
AES70	B-Protocol
protocols	O
offer	O
encryption	O
and	O
authentication	O
options	O
that	O
allow	O
the	O
construction	O
of	O
secure	O
control	O
and	O
monitoring	O
networks	O
.	O
</s>
<s>
Completely	O
secure	O
media	O
networks	O
will	O
require	O
encryption	O
of	O
transmitted	O
program	O
content	O
as	O
well	O
;	O
the	O
mechanisms	O
for	O
such	O
encryption	O
lie	O
outside	O
the	O
scope	O
of	O
OCAAES70	O
although	O
AES70	B-Protocol
may	O
be	O
used	O
to	O
configure	O
and	O
control	O
them	O
.	O
</s>
<s>
AES70	B-Protocol
defines	O
primitives	O
that	O
allow	O
reliable	O
update	O
of	O
device	O
firmware	O
over	O
the	O
network	O
.	O
</s>
<s>
AES70	B-Protocol
is	O
an	O
open	O
and	O
license-free	O
standard	O
.	O
</s>
<s>
Although	O
AES70	B-Protocol
is	O
nurtured	O
and	O
promoted	O
by	O
the	O
OCA	O
Alliance	O
,	O
membership	O
in	O
the	O
Alliance	O
is	O
not	O
required	O
in	O
order	O
to	O
use	O
AES70	B-Protocol
.	O
</s>
<s>
AES70	B-Protocol
documents	O
are	O
available	O
from	O
the	O
Audio	O
Engineering	O
Society	O
(	O
AES	O
)	O
Standards	O
Store	O
.	O
</s>
<s>
Also	O
known	O
as	O
OCF	O
,	O
this	O
specification	O
describes	O
the	O
overall	O
architecture	O
of	O
AES70	B-Protocol
and	O
describes	O
its	O
mechanisms	O
.	O
</s>
<s>
OCF	O
is	O
published	O
in	O
a	O
document	O
named	O
AES-1-2015	O
:	O
AES	O
standard	O
for	O
Audio	O
applications	O
of	O
networks	O
-	O
Open	B-Protocol
Control	I-Protocol
Architecture	I-Protocol
-	O
Part	O
1	O
:	O
Framework	O
.	O
</s>
<s>
Also	O
known	O
as	O
OCC	O
,	O
this	O
specification	O
describes	O
the	O
object-oriented	O
class	O
structure	O
that	O
defines	O
the	O
functional	O
repertoire	O
(	O
connection	O
management	O
,	O
control	O
,	O
and	O
monitoring	O
)	O
of	O
AES70	B-Protocol
.	O
</s>
<s>
In	O
AES70-2015	O
,	O
only	O
one	O
protocol	O
--	O
OCP.1	O
--	O
is	O
defined	O
.	O
</s>
<s>
It	O
is	O
for	O
TCP/IP	O
networks	O
.	O
</s>
<s>
The	O
*	O
.xmi	B-Language
files	O
are	O
master	O
files	O
in	O
XMI	O
2.1	O
,	O
a	O
standard	O
format	O
for	O
representation	O
of	O
UML	O
information	O
.	O
</s>
<s>
XMI	O
stands	O
for	O
"	O
XML	B-Language
Metadata	I-Language
Interchange	I-Language
"	O
.	O
</s>
<s>
See	O
XML	B-Language
Metadata	I-Language
Interchange	I-Language
for	O
more	O
information	O
.	O
</s>
<s>
With	O
the	O
publication	O
of	O
the	O
AES70	B-Protocol
standard	O
in	O
2016	O
,	O
the	O
Alliance	O
's	O
purposes	O
have	O
evolved	O
,	O
and	O
are	O
now	O
:	O
</s>
<s>
Promoting	O
the	O
adoption	O
of	O
AES70	B-Protocol
through	O
marketing	O
,	O
education	O
and	O
training	O
.	O
</s>
<s>
Developing	O
documents	O
and	O
tools	O
that	O
complement	O
the	O
AES70	B-Protocol
standard	O
,	O
by	O
providing	O
useful	O
advice	O
and	O
materials	O
to	O
developers	O
of	O
AES70-compliant	O
products	O
and	O
to	O
end	O
users	O
of	O
AES70	B-Protocol
systems	O
.	O
</s>
<s>
Working	O
with	O
other	O
standards	O
groups	O
to	O
ensure	O
the	O
optimum	O
blending	O
of	O
AES70	B-Protocol
with	O
other	O
industry	O
media	O
networking	O
standards	O
,	O
especially	O
those	O
related	O
to	O
media	O
program	O
transfer	O
.	O
</s>
<s>
Developing	O
recommended	O
enhancements	O
to	O
the	O
AES70	B-Protocol
standard	O
.	O
</s>
<s>
Alliance	O
members	O
are	O
large	O
and	O
small	O
companies	O
who	O
desire	O
to	O
steer	O
the	O
evolution	O
of	O
AES70	B-Protocol
,	O
and	O
to	O
benefit	O
from	O
the	O
exchange	O
of	O
technology	O
and	O
business	O
information	O
that	O
a	O
trade	O
association	O
can	O
provide	O
.	O
</s>
<s>
A	O
number	O
of	O
development	O
tools	O
/	O
open	O
source	O
code	O
is	O
available	O
which	O
helps	O
in	O
start	O
developing	O
AES70	B-Protocol
compatible	O
products	O
.	O
</s>
