<s>
An	O
ATM	B-Protocol
Adaptation	I-Protocol
layer	I-Protocol
1	I-Protocol
or	O
AAL1	B-Protocol
is	O
used	O
for	O
transmitting	O
Class	O
A	O
network	O
traffic	O
,	O
that	O
is	O
,	O
real-time	O
,	O
constant	O
bit	O
rate	O
,	O
connection	B-Protocol
oriented	I-Protocol
traffic	O
(	O
example	O
-	O
uncompressed	O
audio	O
and	O
video	O
)	O
.	O
</s>
<s>
For	O
this	O
traffic	O
,	O
error	B-Error_Name
detection	I-Error_Name
protocols	O
cannot	O
be	O
used	O
since	O
timeouts	O
and	O
retransmission	O
causes	O
delay	O
but	O
the	O
missing	O
cells	O
are	O
reported	O
to	O
the	O
application	O
,	O
that	O
must	O
take	O
its	O
own	O
action	O
to	O
recover	O
from	O
them	O
.	O
</s>
