<s>
The	O
Program	B-Device
and	I-Device
System	I-Device
Information	I-Device
Protocol	I-Device
(	O
PSIP	B-Device
)	O
is	O
the	O
MPEG	O
(	O
Moving	O
Picture	O
Experts	O
Group	O
,	O
a	O
video	O
and	O
audio	O
industry	O
group	O
)	O
and	O
privately	O
defined	O
program-specific	O
information	O
originally	O
defined	O
by	O
General	O
Instrument	O
for	O
the	O
DigiCipher	B-Device
2	I-Device
system	O
and	O
later	O
extended	O
for	O
the	O
ATSC	B-Device
digital	O
television	O
system	O
for	O
carrying	O
metadata	O
about	O
each	O
channel	O
in	O
the	O
broadcast	B-Operating_System
MPEG	O
transport	O
stream	O
of	O
a	O
television	O
station	O
and	O
for	O
publishing	O
information	O
about	O
television	O
programs	O
so	O
that	O
viewers	O
can	O
select	O
what	O
to	O
watch	O
by	O
title	O
and	O
description	O
.	O
</s>
<s>
PSIP	B-Device
defines	O
virtual	B-Protocol
channels	I-Protocol
and	O
content	O
ratings	O
,	O
as	O
well	O
as	O
electronic	B-Device
program	I-Device
guides	I-Device
with	O
titles	O
and	O
(	O
optionally	O
)	O
descriptions	O
to	O
be	O
decoded	O
and	O
displayed	O
by	O
the	O
ATSC	B-Device
tuner	I-Device
.	O
</s>
<s>
PSIP	B-Device
can	O
also	O
send	O
:	O
</s>
<s>
PSIP	B-Device
is	O
defined	O
in	O
ATSC	B-Device
standard	I-Device
A/65	B-Device
,	O
the	O
most	O
recent	O
revision	O
of	O
which	O
is	O
A/65:2013	O
,	O
published	O
in	O
2013	O
.	O
</s>
<s>
A/69	B-Device
is	O
a	O
recommended	O
practice	O
for	O
implementing	O
PSIP	B-Device
in	O
a	O
television	O
station	O
.	O
</s>
<s>
PSIP	B-Device
also	O
supersedes	O
the	O
A/55	O
and	O
A/56	O
protocol	O
methods	O
of	O
delivering	O
program	B-Device
guide	I-Device
information	O
(	O
which	O
the	O
ATSC	B-Device
has	O
deleted	O
)	O
.	O
</s>
<s>
TV	B-Device
Guide	I-Device
On	I-Device
Screen	I-Device
is	O
a	O
different	O
,	O
proprietary	O
system	O
provided	O
by	O
datacasting	O
on	O
a	O
single	O
station	O
,	O
while	O
PSIP	B-Device
is	O
required	O
,	O
at	O
least	O
in	O
the	O
United	O
States	O
,	O
to	O
be	O
sent	O
by	O
every	O
digital	O
television	O
station	O
.	O
</s>
<s>
PSIP	B-Device
information	O
may	O
be	O
passed	O
through	O
the	O
airchain	O
using	O
proprietary	O
protocols	O
or	O
through	O
use	O
of	O
the	O
Programming	O
Metadata	O
Communication	O
Protocol	O
metadata	O
scheme	O
.	O
</s>
<s>
PMCP	O
,	O
defined	O
in	O
the	O
Advanced	O
Television	O
Systems	O
Committee	O
's	O
A/76B	O
,	O
provides	O
ATSC	B-Device
broadcasters	O
with	O
a	O
standardized	O
means	O
to	O
exchange	O
system	O
information	O
(	O
SI	O
)	O
among	O
systems	O
that	O
create	O
and	O
manage	O
these	O
data	O
elements	O
.	O
</s>
<s>
These	O
systems	O
can	O
be	O
outside	O
Program	O
listing	O
services	O
,	O
program	O
management	O
systems	O
,	O
traffic	O
(	O
commercial	O
and	O
program	O
scheduling	O
)	O
and	O
broadcast	B-Operating_System
automation	O
systems	O
,	O
which	O
all	O
contribute	O
a	O
portion	O
of	O
the	O
PSIP	B-Device
data	O
to	O
a	O
PSIP	B-Device
Generator	O
.	O
</s>
<s>
At	O
the	O
heart	O
of	O
PMCP	O
is	O
an	O
XML	B-Protocol
Schema	O
(	O
actually	O
a	O
collection	O
of	O
XML	B-Protocol
Schema	O
Definition	O
files	O
)	O
,	O
which	O
provide	O
a	O
standardized	O
structure	O
into	O
which	O
PSI	O
and	O
PSIP-related	O
data	O
may	O
be	O
exchanged	O
.	O
</s>
<s>
PMCP	O
was	O
first	O
published	O
as	O
A/76	O
in	O
November	O
2004	O
,	O
and	O
enjoys	O
adoption	O
from	O
a	O
variety	O
of	O
broadcast	B-Operating_System
equipment	O
and	O
system	O
vendors	O
.	O
</s>
<s>
ATSC	B-Device
A/76a	O
extended	O
PMCP	O
to	O
include	O
metadata	O
necessary	O
for	O
proper	O
signaling	O
of	O
ACAP	O
data	B-Operating_System
broadcast	I-Operating_System
elements	O
,	O
and	O
A/76B	O
,	O
was	O
released	O
in	O
2007	O
,	O
fixed	O
some	O
errors	O
and	O
made	O
the	O
schema	O
usable	O
with	O
the	O
related	O
SMPTE	O
S2021	O
(	O
BXF	O
)	O
schema	O
.	O
</s>
<s>
Data	O
pointers	O
to	O
other	O
PSIP	B-Device
tables	O
.	O
</s>
<s>
Defines	O
each	O
virtual	B-Protocol
channel	I-Protocol
and	O
enables	O
to	O
be	O
associated	O
with	O
the	O
channel	O
.	O
</s>
<s>
Assigns	O
numbers	O
to	O
each	O
virtual	B-Protocol
channel	I-Protocol
and	O
enables	O
to	O
be	O
associated	O
with	O
the	O
channel	O
.	O
</s>
<s>
Titles	O
and	O
program	B-Device
guide	I-Device
data	O
.	O
</s>
<s>
The	O
DCC	O
function	O
lets	O
broadcasters	O
tell	O
a	O
digital	O
television	O
receiver	B-Device
where	O
to	O
change	O
,	O
based	O
upon	O
the	O
viewer	O
's	O
settings	O
.	O
</s>
<s>
Implementation	O
of	O
the	O
DCC	O
feature	O
is	O
entirely	O
optional	O
,	O
and	O
depends	O
on	O
development	O
of	O
receiver	B-Device
and	O
decoder	O
technology	O
.	O
</s>
<s>
For	O
example	O
,	O
a	O
digital	B-Application
video	I-Application
recorder	I-Application
could	O
record	O
commercial	O
broadcast	B-Operating_System
at	O
other	O
times	O
for	O
later	O
replay	O
,	O
so	O
that	O
many	O
more	O
different	O
commercials	O
could	O
be	O
shown	O
in	O
different	O
parts	O
of	O
a	O
large	O
metro	O
area	O
than	O
can	O
actually	O
be	O
transmitted	O
at	O
once	O
.	O
</s>
