<s>
In	O
computer	B-Architecture
networking	I-Architecture
,	O
cell	B-Protocol
relay	I-Protocol
refers	O
to	O
a	O
method	O
of	O
statistically	B-Algorithm
multiplexing	I-Algorithm
small	O
fixed-length	O
packets	B-Protocol
,	O
called	O
"	O
cells	O
"	O
,	O
to	O
transport	O
data	O
between	O
computers	O
or	O
kinds	O
of	O
network	B-Device
equipment	I-Device
.	O
</s>
<s>
It	O
is	O
a	O
reliable	B-Protocol
,	O
connection-oriented	B-Protocol
packet	B-Protocol
switched	I-Protocol
data	O
communications	O
protocol	O
.	O
</s>
<s>
Cell	B-Protocol
relay	I-Protocol
transmission	O
rates	O
usually	O
are	O
between	O
56	O
kbit/s	O
and	O
several	O
gigabits	O
per	O
second	O
.	O
</s>
<s>
ATM	O
,	O
a	O
particularly	O
popular	O
form	O
of	O
cell	B-Protocol
relay	I-Protocol
,	O
is	O
most	O
commonly	O
used	O
for	O
home	O
DSL	O
connections	O
,	O
which	O
often	O
runs	O
between	O
128	O
kbit/s	O
and	O
1.544	O
Mbit/s	O
(	O
DS1	B-Protocol
)	O
,	O
and	O
for	O
high-speed	O
backbone	O
connections	O
(	O
OC-3	O
and	O
faster	O
)	O
.	O
</s>
<s>
Cell	B-Protocol
relay	I-Protocol
protocols	O
have	O
neither	O
flow	O
control	O
nor	O
error	B-Error_Name
correction	I-Error_Name
capability	O
,	O
are	O
information-content	O
independent	O
,	O
and	O
correspond	O
only	O
to	O
layers	O
one	O
and	O
two	O
of	O
the	O
OSI	O
Reference	O
Model	O
.	O
</s>
<s>
Cell	B-Protocol
relay	I-Protocol
can	O
be	O
used	O
for	O
delay	O
-	O
and	O
jitter-sensitive	O
traffic	O
such	O
as	O
voice	O
and	O
video	O
.	O
</s>
<s>
Cell	B-Protocol
relay	I-Protocol
systems	O
break	O
variable-length	O
user	O
packets	B-Protocol
into	O
groups	O
of	O
fixed-length	O
cells	O
,	O
that	O
add	O
addressing	O
and	O
verification	O
information	O
.	O
</s>
<s>
Frame	B-Protocol
length	O
is	O
fixed	O
in	O
networking	B-Device
hardware	I-Device
,	O
based	O
on	O
time	O
delay	O
and	O
user	O
packet-length	O
considerations	O
.	O
</s>
<s>
Cell	B-Protocol
relay	I-Protocol
systems	O
may	O
also	O
carry	O
bitstream-based	O
data	O
such	O
as	O
PDH	B-Protocol
traffic	O
,	O
by	O
breaking	O
it	O
into	O
streams	O
of	O
cells	O
,	O
with	O
a	O
lightweight	O
synchronization	O
and	O
clock	O
recovery	O
shim	O
.	O
</s>
<s>
Thus	O
cell	B-Protocol
relay	I-Protocol
systems	O
may	O
potentially	O
carry	O
any	O
combination	O
of	O
stream-based	O
and	O
packet-based	O
data	O
.	O
</s>
<s>
This	O
is	O
a	O
form	O
of	O
statistical	B-Algorithm
time	I-Algorithm
division	I-Algorithm
multiplexing	I-Algorithm
.	O
</s>
<s>
Cell	B-Protocol
relay	I-Protocol
is	O
an	O
implementation	O
of	O
fast	B-Protocol
packet-switching	I-Protocol
technology	O
that	O
is	O
used	O
in	O
connection-oriented	B-Protocol
broadband	B-Protocol
integrated	I-Protocol
services	I-Protocol
digital	I-Protocol
networks	I-Protocol
(	O
B-ISDN	B-Protocol
,	O
and	O
its	O
better-known	O
supporting	O
technology	O
ATM	O
)	O
and	O
connectionless	O
IEEE	O
802.6	O
switched	B-Protocol
multi-megabit	I-Protocol
data	I-Protocol
service	I-Protocol
(	O
SMDS	B-Protocol
)	O
.	O
</s>
<s>
Cell	B-Protocol
relay	I-Protocol
utilizes	O
data	O
cells	O
of	O
a	O
persistent	O
size	O
.	O
</s>
<s>
Frames	O
are	O
comparable	O
to	O
data	B-Protocol
packets	I-Protocol
;	O
however	O
they	O
contrast	O
from	O
cells	O
in	O
that	O
they	O
may	O
fluctuate	O
in	O
size	O
based	O
on	O
circumstances	O
.	O
</s>
<s>
Per	O
se	O
,	O
all	O
delicate	O
and	O
significant	O
transmissions	O
may	O
perhaps	O
be	O
transported	O
faster	O
via	O
fixed-sized	O
cells	O
,	O
which	O
are	O
simpler	O
to	O
transmit	O
compared	O
to	O
variable-sized	O
frames	O
or	O
packets	B-Protocol
.	O
</s>
<s>
Cell	B-Protocol
relay	I-Protocol
is	O
extremely	O
reliable	B-Protocol
for	O
transporting	O
vital	O
data	O
.	O
</s>
<s>
An	O
example	O
of	O
cell	B-Protocol
relay	I-Protocol
is	O
ATM	O
,	O
a	O
prevalent	O
form	O
utilized	O
to	O
transfer	O
a	O
cell	O
with	O
a	O
fixed	O
size	O
of	O
53	O
bytes	O
.	O
</s>
