<s>
Government	B-General_Concept
Secure	I-General_Concept
Intranet	I-General_Concept
(	O
GSi	O
)	O
was	O
a	O
United	O
Kingdom	O
government	O
wide	O
area	O
network	O
,	O
whose	O
main	O
purpose	O
was	O
to	O
enable	O
connected	O
organisations	O
to	O
communicate	O
electronically	O
and	O
securely	O
at	O
low	O
protective	O
marking	O
levels	O
.	O
</s>
<s>
GSi	O
was	O
designed	O
as	O
an	O
accredited	O
,	O
dual	O
link	O
connected	O
Internet	B-Protocol
Protocol	I-Protocol
backbone	O
,	O
it	O
imposed	O
no	O
restrictions	O
on	O
what	O
type	O
of	O
traffic	O
it	O
carried	O
;	O
any	O
restrictions	O
were	O
considered	O
a	O
policy	O
decision	O
for	O
each	O
connecting	O
department	O
.	O
</s>
<s>
GSi	O
used	O
SMTP	B-Protocol
as	O
mail	O
transport	O
protocol	O
,	O
and	O
the	O
conversion	O
from	O
the	O
then	O
prevalent	O
X.400	B-Protocol
email	O
facilities	O
to	O
SMTP	B-Protocol
proved	O
for	O
many	O
departments	O
an	O
improvement	O
in	O
reliability	O
and	O
speed	O
.	O
</s>
<s>
In	O
the	O
case	O
of	O
X.400	B-Protocol
,	O
this	O
conversion	O
also	O
cut	O
email	O
costs	O
substantially	O
as	O
X.400	B-Protocol
message	O
conversions	O
were	O
still	O
chargeable	O
even	O
if	O
the	O
conversion	O
failed	O
due	O
to	O
message	O
size	O
.	O
</s>
<s>
GCF	O
is	O
intended	O
to	O
facilitate	O
the	O
migration	O
to	O
the	O
Public	B-General_Concept
Services	I-General_Concept
Network	I-General_Concept
.	O
</s>
<s>
Scottish	O
local	O
authorities	O
have	O
already	O
established	O
a	O
similar	O
network	O
known	O
as	O
the	O
Government	B-General_Concept
Secure	I-General_Concept
Extranet	I-General_Concept
(	O
GSX	O
)	O
.	O
</s>
<s>
As	O
both	O
GCSX	O
and	O
the	O
Police	O
National	O
Network	O
(	O
PNN	O
)	O
are	O
both	O
connected	O
to	O
the	O
wider	O
Government	B-General_Concept
Secure	I-General_Concept
Intranet	I-General_Concept
(	O
GSi	O
)	O
,	O
data	O
can	O
be	O
transferred	O
securely	O
between	O
local	O
authorities	O
and	O
the	O
Police	O
.	O
</s>
<s>
The	O
Public	B-General_Concept
Services	I-General_Concept
Network	I-General_Concept
is	O
a	O
UK	O
Government	O
programme	O
that	O
unified	O
the	O
provision	O
of	O
network	O
infrastructure	O
across	O
the	O
United	O
Kingdom	O
public	O
sector	O
into	O
an	O
interconnected	O
"	O
network	O
of	O
networks	O
"	O
.	O
</s>
<s>
Centrally	O
procured	O
public	B-General_Concept
sector	I-General_Concept
networks	I-General_Concept
migrated	O
across	O
to	O
the	O
PSN	O
framework	O
as	O
they	O
reached	O
the	O
end	O
of	O
their	O
contract	O
terms	O
,	O
either	O
through	O
an	O
interim	O
framework	O
or	O
directly	O
.	O
</s>
<s>
The	O
Government	B-General_Concept
Secure	I-General_Concept
Intranet	I-General_Concept
(	O
GSi	O
)	O
contracts	O
expired	O
in	O
September	O
2011	O
,	O
running	O
on	O
to	O
12	O
February	O
2012	O
and	O
were	O
replaced	O
by	O
the	O
transitional	O
Government	B-General_Concept
Secure	I-General_Concept
Intranet	I-General_Concept
Convergence	O
Framework	O
(	O
GCF	O
)	O
.	O
</s>
