<s>
Examples	O
of	O
services	O
that	O
need	O
adaptations	O
are	O
Gigabit	O
Ethernet	O
,	O
IP	B-Protocol
,	O
Frame	B-Protocol
Relay	I-Protocol
,	O
SONET/SDH	B-Protocol
,	O
UMTS/Wireless	O
,	O
etc	O
.	O
</s>
<s>
The	O
main	O
services	O
provided	O
by	O
AAL	B-Protocol
(	O
ATM	B-Protocol
Adaptation	I-Protocol
Layer	I-Protocol
)	O
are	O
:	O
</s>
<s>
The	O
following	O
ATM	B-Protocol
Adaptation	I-Protocol
Layer	I-Protocol
protocols	O
(	O
AALs	B-Protocol
)	O
have	O
been	O
defined	O
by	O
the	O
ITU-T	O
.	O
</s>
<s>
AAL	B-Protocol
Type	O
0	O
(	O
also	O
referred	O
as	O
raw	O
cells	O
)	O
consists	O
of	O
48	O
bytes	O
of	O
payload	O
without	O
any	O
reservation	O
for	O
special	O
fields	O
.	O
</s>
<s>
AAL	B-Protocol
Type	I-Protocol
1	I-Protocol
supports	O
constant	O
bit	O
rate	O
(	O
CBR	O
)	O
,	O
synchronous	O
,	O
connection	O
oriented	O
traffic	O
.	O
</s>
<s>
AAL	B-Protocol
Type	I-Protocol
2	I-Protocol
supports	O
time-dependent	O
Variable	O
Bit	O
Rate	O
(	O
VBR-RT	O
)	O
of	O
connection-oriented	O
,	O
synchronous	O
traffic	O
.	O
</s>
<s>
Examples	O
include	O
Voice	B-Application
over	I-Application
ATM	I-Application
.	O
</s>
<s>
AAL2	B-Protocol
is	O
also	O
widely	O
used	O
in	O
wireless	O
applications	O
due	O
to	O
the	O
capability	O
of	O
multiplexing	O
voice	O
packets	O
from	O
different	O
users	O
on	O
a	O
single	O
ATM	O
connection	O
.	O
</s>
<s>
AAL	B-Protocol
Type	O
3/4	O
supports	O
VBR	O
,	O
data	O
traffic	O
,	O
connection-oriented	O
,	O
asynchronous	O
traffic	O
(	O
e.g.	O
</s>
<s>
Examples	O
include	O
Frame	B-Protocol
Relay	I-Protocol
and	O
X.25	O
.	O
</s>
<s>
AAL	B-Protocol
Type	I-Protocol
5	I-Protocol
is	O
similar	O
to	O
AAL	B-Protocol
3/4	O
with	O
a	O
simplified	O
information	O
header	O
scheme	O
.	O
</s>
<s>
This	O
AAL	B-Protocol
assumes	O
that	O
the	O
data	O
is	O
sequential	O
from	O
the	O
end	O
user	O
and	O
uses	O
the	O
Payload	O
Type	O
Indicator	O
(	O
PTI	O
)	O
bit	O
to	O
indicate	O
the	O
last	O
cell	O
in	O
a	O
transmission	O
.	O
</s>
<s>
Examples	O
of	O
services	O
that	O
use	O
AAL	B-Protocol
5	O
are	O
classic	O
IP	B-Protocol
over	O
ATM	O
,	O
Ethernet	O
Over	O
ATM	O
,	O
SMDS	O
,	O
and	O
LAN	O
Emulation	O
(	O
LANE	O
)	O
.	O
</s>
<s>
AAL	B-Protocol
5	O
is	O
a	O
widely	O
used	O
ATM	B-Protocol
adaptation	I-Protocol
layer	I-Protocol
protocol	O
.	O
</s>
<s>
AAL	B-Protocol
5	O
was	O
introduced	O
to	O
:	O
</s>
<s>
The	O
AAL	B-Protocol
5	O
was	O
designed	O
to	O
accommodate	O
the	O
same	O
variable	O
bit	O
rate	O
,	O
connection-oriented	O
asynchronous	O
traffic	O
or	O
connectionless	O
packet	O
data	O
supported	O
by	O
AAL	B-Protocol
3/4	O
,	O
but	O
without	O
the	O
segment	O
tracking	O
and	O
error	O
correction	O
requirements	O
.	O
</s>
