<s>
DX	B-Device
200	I-Device
is	O
a	O
digital	B-General_Concept
switching	O
platform	O
currently	O
developed	O
by	O
Nokia	O
Networks	O
.	O
</s>
<s>
DX	B-Device
200	I-Device
is	O
a	O
versatile	O
,	O
fault-tolerant	B-General_Concept
,	O
modular	O
and	O
highly	O
scalable	B-Architecture
telephone	O
exchange	O
and	O
general	O
purpose	O
server	O
platform	O
,	O
designed	O
for	O
high	O
performance	O
,	O
high	O
availability	B-Device
applications	O
.	O
</s>
<s>
Architecture	O
of	O
DX	B-Device
200	I-Device
allows	O
live	O
migration	O
as	O
well	O
as	O
software	O
update	O
during	O
live	O
operation	O
.	O
</s>
<s>
Unlike	O
in	O
many	O
other	O
switching	O
platforms	O
,	O
DX	B-Device
200	I-Device
performs	O
live	O
software	O
update	O
without	O
code	O
patching	O
.	O
</s>
<s>
Furthermore	O
,	O
as	O
opposed	O
to	O
"	O
integration	O
guessing	O
"	O
of	O
various	O
software	O
patches	O
,	O
DX	B-Device
200	I-Device
architecture	O
makes	O
proper	O
integration	O
testing	O
of	O
software	O
components	O
possible	O
.	O
</s>
<s>
dynamically	B-General_Concept
allocated	I-General_Concept
memory	I-General_Concept
,	O
with	O
the	O
exception	O
of	O
stack	B-General_Concept
of	I-General_Concept
procedures	I-General_Concept
)	O
are	O
moved	O
from	O
the	O
old	O
to	O
the	O
new	O
computer	O
unit	O
.	O
</s>
<s>
Copying	O
data	O
does	O
not	O
require	O
any	O
programming	O
effort	O
,	O
as	O
long	O
as	O
allocation	O
of	O
data	O
is	O
done	O
using	O
TNSDL	B-Language
language	I-Language
.	O
</s>
<s>
Developing	O
software	O
for	O
DX	B-Device
200	I-Device
platform	O
is	O
rather	O
straightforward	O
for	O
any	O
well	O
educated	O
software	O
developer	O
.	O
</s>
<s>
TNSDL	B-Language
language	I-Language
,	O
which	O
plays	O
vital	O
role	O
in	O
producing	O
asynchronously	O
communicating	O
fault-tolerant	B-General_Concept
software	O
modules	O
,	O
is	O
easy	O
to	O
learn	O
.	O
</s>
<s>
Software	O
architecture	O
of	O
DX	B-Device
200	I-Device
is	O
a	O
fine	O
combination	O
of	O
highly	O
efficient	O
traditional	O
solutions	O
as	O
well	O
as	O
modern	O
actor	B-Application
model	I-Application
based	O
,	O
highly	O
concurrent	B-Architecture
design	O
.	O
</s>
<s>
DX	B-Device
200	I-Device
products	O
are	O
famous	O
for	O
availability	B-Device
exceeding	O
99.999	O
%	O
"	O
five	O
nines	O
"	O
as	O
well	O
as	O
unrivaled	O
performance	O
.	O
</s>
<s>
DX	B-Device
200	I-Device
is	O
a	O
generic	O
architecture	O
.	O
</s>
<s>
Applications	O
include	O
traditional	O
Mobile	B-Device
Switching	I-Device
Centers	I-Device
(	O
MSC	O
)	O
,	O
LTE	O
mobile	B-General_Concept
packet	I-General_Concept
switching	I-General_Concept
gateways	O
as	O
well	O
as	O
VoIP	B-Application
application	O
servers	O
.	O
</s>
<s>
Any	O
generic	O
operating	O
system	O
can	O
be	O
ported	O
to	O
DX	B-Device
200	I-Device
relatively	O
easily	O
.	O
</s>
<s>
Linux	B-Application
,	O
ChorusOS	B-Operating_System
and	O
DMX	O
are	O
the	O
most	O
frequent	O
operating	O
systems	O
used	O
on	O
DX	B-Device
200	I-Device
.	O
</s>
<s>
DMX	O
is	O
the	O
'	O
native	O
 '	O
OS	O
of	O
DX	B-Device
200	I-Device
.	O
</s>
<s>
DMX	O
has	O
microkernel	B-Operating_System
architecture	O
.	O
</s>
<s>
DX	B-Device
200	I-Device
has	O
several	O
hardware	O
flavors	O
.	O
</s>
<s>
Sub-rack	O
DX	B-Device
200	I-Device
:	O
Computer	O
units	O
are	O
built	O
up	O
from	O
several	O
cards	O
,	O
packed	O
together	O
as	O
sub-racks	O
.	O
</s>
<s>
Cartridge	O
DX	B-Device
200	I-Device
:	O
Computer	O
units	O
are	O
standalone	O
cards	O
.	O
</s>
<s>
ATCA	O
DX	B-Device
200	I-Device
:	O
Advanced	O
Telecommunications	O
Computing	O
Architecture	O
industry	O
standard	O
hardware	O
.	O
</s>
<s>
IPA2800	O
:	O
A	O
specific	O
version	O
of	O
Cartridge	O
DX	B-Device
200	I-Device
,	O
suitable	O
for	O
very	O
high	O
throughput	O
real-time	O
media	O
processing	O
and	O
transmission	O
.	O
</s>
<s>
The	O
highly	O
valuable	O
business	O
logic	O
was	O
kept	O
,	O
while	O
the	O
products	O
which	O
used	O
to	O
be	O
running	O
on	O
DX	B-Device
200	I-Device
hardware	O
variants	O
now	O
available	O
as	O
cloud	B-Architecture
solutions	O
,	O
working	O
on	O
generic	O
multi-purpose	O
hardware	O
of	O
various	O
vendors	O
.	O
</s>
<s>
The	O
first	O
generation	O
of	O
such	O
products	O
used	O
virtual	O
machines	O
in	O
place	O
of	O
DX	B-Device
200	I-Device
computer	O
units	O
.	O
</s>
<s>
That	O
software	O
architecture	O
supports	O
virtual	B-General_Concept
environments	I-General_Concept
like	O
Linux	B-Application
's	O
KVM	B-Application
or	O
VMware	O
products	O
.	O
</s>
<s>
The	O
next	O
generation	O
,	O
in	O
line	O
with	O
leading	O
industry	O
trends	O
,	O
is	O
based	O
on	O
Linux	B-Application
,	O
uses	O
software	B-Application
containers	I-Application
,	O
focused	O
on	O
microservices	O
,	O
dynamic	O
service	O
discovery	O
and	O
orchestration	B-Application
.	O
</s>
<s>
In	O
place	O
of	O
live	O
migration	O
offered	O
by	O
TNSDL	B-Language
language	I-Language
session	O
data	O
are	O
stored	O
in	O
distributed	O
database	O
.	O
</s>
<s>
While	O
live	O
migration	O
happened	O
from	O
a	O
certain	O
computer	O
to	O
another	O
one	O
,	O
in	O
the	O
new	O
architecture	O
those	O
sessions	O
may	O
be	O
moved	O
to	O
different	O
containers	B-Application
,	O
thus	O
allowing	O
scaling	B-Architecture
in	O
(	O
reducing	O
the	O
number	O
of	O
containers	B-Application
and	O
VMs	O
)	O
in	O
the	O
system	O
.	O
</s>
<s>
JSON	B-General_Concept
)	O
instead	O
of	O
binary	O
structures	O
allows	O
more	O
relaxed	O
version	O
updates	O
.	O
</s>
<s>
After	O
the	O
first	O
installation	O
in	O
1982	O
,	O
the	O
DX	B-Device
200	I-Device
captured	O
a	O
50%	O
share	O
of	O
the	O
Finnish	O
fixed	B-Application
line	I-Application
exchange	O
market	O
.	O
</s>
<s>
By	O
1987	O
the	O
installation	O
base	O
had	O
grown	O
to	O
400,000	O
subscriber	B-Architecture
lines	I-Architecture
.	O
</s>
<s>
Core	O
network	O
components	O
were	O
based	O
on	O
DX	B-Device
200	I-Device
platform	O
.	O
</s>
<s>
In	O
2005	O
,	O
DX	B-Device
200	I-Device
based	O
VoIP	B-Application
server	O
was	O
provided	O
to	O
Finnish	O
operator	O
Saunalahti	O
,	O
providing	O
state	O
of	O
the	O
art	O
fixed-mobile	O
convergence	O
solution	O
.	O
</s>
<s>
This	O
is	O
a	O
prime	O
example	O
on	O
how	O
well	O
DX	B-Device
200	I-Device
is	O
suitable	O
for	O
internet	O
server	O
development	O
and	O
the	O
overall	O
flexibility	O
of	O
the	O
whole	O
DX	B-Device
200	I-Device
platform	O
.	O
</s>
<s>
In	O
2013	O
,	O
NSN	O
showed	O
its	O
truly	O
operational	O
telco	O
cloud	B-Architecture
solution	O
.	O
</s>
<s>
That	O
actually	O
marks	O
the	O
end	O
of	O
the	O
traditional	O
DX200	B-Device
hardware	O
product	O
line	O
.	O
</s>
