<s>
Carrier	B-Application
Grade	I-Application
Linux	I-Application
(	O
CGL	O
)	O
is	O
a	O
set	O
of	O
specifications	O
which	O
detail	O
standards	O
of	O
availability	O
,	O
scalability	B-Architecture
,	O
manageability	O
,	O
and	O
service	O
response	O
characteristics	O
which	O
must	O
be	O
met	O
in	O
order	O
for	O
Linux	O
kernel-based	O
operating	O
system	O
to	O
be	O
considered	O
"	O
carrier	O
grade	O
"	O
(	O
i.e.	O
</s>
<s>
The	O
term	O
is	O
particularly	O
applicable	O
as	O
telecom	O
converges	O
technically	O
with	O
data	B-Architecture
networks	I-Architecture
and	O
commercial	O
off-the-shelf	O
commoditized	B-Device
components	O
such	O
as	O
blade	B-Architecture
servers	I-Architecture
.	O
</s>
<s>
The	O
primary	O
motivation	O
behind	O
the	O
CGL	O
effort	O
is	O
to	O
present	O
an	O
open	B-Architecture
architecture	I-Architecture
alternative	O
to	O
the	O
closed	O
,	O
proprietary	B-Application
software	I-Application
on	O
proprietary	B-Device
hardware	I-Device
systems	O
that	O
are	O
currently	O
used	O
in	O
telecommunication	O
systems	O
.	O
</s>
<s>
These	O
proprietary	B-Application
systems	O
are	O
monolithic	O
(	O
hardware	O
,	O
software	O
and	O
applications	O
integrated	O
very	O
tightly	O
)	O
and	O
operate	O
well	O
as	O
a	O
unit	O
.	O
</s>
<s>
CGL	O
seeks	O
to	O
progressively	O
reduce	O
or	O
to	O
eliminate	O
this	O
dependence	O
on	O
proprietary	B-Application
systems	O
and	O
provide	O
a	O
path	O
for	O
easy	O
deployment	O
and	O
scalability	B-Architecture
by	O
utilizing	O
cheap	O
COTS	O
systems	O
to	O
assemble	O
a	O
telecommunications	O
system	O
.	O
</s>
<s>
The	O
specification	O
is	O
now	O
in	O
the	O
combined	O
Linux	B-Operating_System
Foundation	I-Operating_System
.	O
</s>
<s>
Several	O
CGL-registered	O
Linux	B-Operating_System
distributions	O
exist	O
,	O
including	O
MontaVista	B-Operating_System
,	O
Wind	O
River	O
Systems	O
and	O
Red	O
Flag	O
Linux	B-Operating_System
.	O
</s>
<s>
The	O
OSDL	O
CGLWG	O
defines	O
three	O
main	O
types	O
of	O
applications	O
that	O
carrier-grade	O
Linux	B-Operating_System
will	O
support	O
—	O
gateways	O
,	O
signaling	O
servers	O
,	O
and	O
management	O
.	O
</s>
<s>
An	O
example	O
of	O
a	O
gateway	O
application	O
is	O
a	O
media	O
gateway	O
,	O
which	O
converts	O
conventional	O
voice	O
circuits	O
using	O
TDM	B-Protocol
to	O
IP	O
packets	O
for	O
transmission	O
over	O
an	O
IP-switched	O
network	O
.	O
</s>
