<s>
Application-layer	B-Protocol
framing	I-Protocol
or	O
application-level	O
framing	O
(	O
ALF	O
)	O
is	O
a	O
method	O
of	O
allowing	O
an	O
application	B-Application
to	O
use	O
its	O
semantics	B-Application
for	O
the	O
design	O
of	O
its	O
network	O
protocols	O
.	O
</s>
<s>
The	O
application	B-Application
splits	O
the	O
data	O
into	O
useful	O
segments	O
.	O
</s>
<s>
These	O
segments	O
are	O
called	O
ADUs	O
(	O
application	B-Application
data	O
units	O
)	O
.	O
</s>
<s>
This	O
procedure	O
simplifies	O
the	O
quality	O
of	O
service	O
negotiation	O
and	O
provides	O
a	O
simpler	O
method	O
of	O
error	B-Error_Name
checking	I-Error_Name
.	O
</s>
<s>
The	O
Real-time	B-Protocol
Transport	I-Protocol
Protocol	I-Protocol
(	O
RTP	O
)	O
is	O
an	O
example	O
of	O
where	O
the	O
semantics	B-Application
of	O
the	O
real-time	O
application	B-Application
are	O
used	O
to	O
segment	O
the	O
data	O
.	O
</s>
