<s>
The	O
Network	B-Algorithm
Abstraction	I-Algorithm
Layer	I-Algorithm
(	O
NAL	O
)	O
is	O
a	O
part	O
of	O
the	O
H.264/AVC	B-Application
and	O
HEVC	B-Algorithm
video	O
coding	O
standards	O
.	O
</s>
<s>
Moreover	O
,	O
other	O
transmission	O
media	O
such	O
as	O
cable	B-Device
modem	I-Device
,	O
xDSL	O
,	O
or	O
UMTS	B-Protocol
offer	O
much	O
lower	O
data	O
rates	O
than	O
broadcast	O
channels	O
,	O
and	O
enhanced	O
coding	O
efficiency	O
can	O
enable	O
the	O
transmission	O
of	O
more	O
video	O
channels	O
or	O
higher	O
quality	O
video	O
representations	O
within	O
existing	O
digital	O
transmission	O
capacities	O
.	O
</s>
<s>
Video	O
coding	O
for	O
telecommunication	O
applications	O
has	O
diversified	O
from	O
ISDN	B-Protocol
and	O
T1/E1	O
service	O
to	O
embrace	O
PSTN	O
,	O
mobile	O
wireless	O
networks	O
,	O
and	O
LAN/Internet	O
network	O
delivery	O
.	O
</s>
<s>
The	O
H.264/AVC	B-Application
and	O
HEVC	B-Algorithm
standards	O
are	O
designed	O
for	O
technical	O
solutions	O
including	O
areas	O
like	O
broadcasting	O
(	O
over	O
cable	O
,	O
satellite	B-Application
,	O
cable	B-Device
modem	I-Device
,	O
DSL	O
,	O
terrestrial	O
,	O
etc	O
.	O
)	O
</s>
<s>
RTP/IP	O
for	O
any	O
kind	O
of	O
real-time	O
wire-line	O
and	O
wireless	O
Internet	O
services	O
.	O
</s>
<s>
MPEG-2	B-Algorithm
systems	O
for	O
broadcasting	O
services	O
,	O
etc	O
.	O
</s>
<s>
The	O
first	O
byte	O
of	O
each	O
H.264/AVC	B-Application
NAL	O
unit	O
is	O
a	O
header	O
byte	O
that	O
contains	O
an	O
indication	O
of	O
the	O
type	O
of	O
data	O
in	O
the	O
NAL	O
unit	O
.	O
</s>
<s>
For	O
HEVC	B-Algorithm
the	O
header	O
was	O
extended	O
to	O
two	O
bytes	O
.	O
</s>
<s>
For	O
use	O
in	O
such	O
systems	O
,	O
the	O
H.264/AVC	B-Application
and	O
HEVC	B-Algorithm
specifications	O
define	O
a	O
byte	O
stream	O
format	O
.	O
</s>
<s>
In	O
other	O
systems	O
(	O
e.g.	O
,	O
IP/RTP	O
systems	O
)	O
,	O
the	O
coded	O
data	O
is	O
carried	O
in	O
packets	O
that	O
are	O
framed	O
by	O
the	O
system	O
transport	O
protocol	O
,	O
and	O
identification	O
of	O
the	O
boundaries	O
of	O
NAL	O
units	O
within	O
the	O
packets	O
can	O
be	O
established	O
without	O
use	O
of	O
start	O
code	O
prefix	O
patterns	O
.	O
</s>
