<s>
Digital	B-Protocol
Multiplex	I-Protocol
System	I-Protocol
(	O
DMS	O
)	O
is	O
the	O
name	O
shared	O
among	O
several	O
different	O
telephony	O
product	O
lines	O
from	O
Nortel	O
Networks	O
for	O
wireline	O
and	O
wireless	O
operators	O
.	O
</s>
<s>
Among	O
them	O
are	O
the	O
DMS-1	O
(	O
originally	O
named	O
the	O
DMS-256	O
)	O
Rural/Urban	O
digital	B-Application
loop	I-Application
carrier	I-Application
,	O
the	O
DMS-10	B-Protocol
telephone	O
switch	O
,	O
the	O
DMS	O
SuperNode	O
family	O
of	O
telephone	O
switches	O
(	O
DMS-100	B-Protocol
,	O
DMS-200	B-Protocol
,	O
DMS-250	B-Protocol
,	O
DMS-300	O
,	O
DMS-500	O
,	O
DMS-GSP	O
,	O
DMS-MSC	O
,	O
DMS-MTX	O
)	O
,	O
and	O
the	O
S/DMS	O
optical	O
transmission	O
system	O
.	O
</s>
<s>
Exploratory	O
development	O
on	O
the	O
technology	O
began	O
at	O
Northern	O
Telecom	O
's	O
Bell	O
Northern	O
Research	O
Labs	O
in	O
Ottawa	O
,	O
Ontario	B-Architecture
in	O
1971	O
.	O
</s>
<s>
The	O
first	O
Class	B-Device
5	I-Device
switch	O
,	O
the	O
DMS-10	B-Protocol
,	O
began	O
service	O
on	O
21	O
October	O
1977	O
in	O
Fort	O
White	O
,	O
Florida	O
and	O
the	O
first	O
toll	B-Device
switch	I-Device
(	O
Class	O
4	O
)	O
,	O
the	O
DMS-200	B-Protocol
,	O
entered	O
service	O
in	O
1979	O
in	O
Ottawa	O
.	O
</s>
<s>
The	O
DMS-10	B-Protocol
was	O
the	O
first	O
commercially	O
successful	O
Class	B-Device
5	I-Device
digital	O
switch	O
in	O
the	O
North	O
American	O
market	O
and	O
had	O
a	O
profound	O
impact	O
on	O
the	O
industry	O
.	O
</s>
<s>
On	O
October	O
16	O
,	O
2006	O
,	O
Nortel	O
received	O
a	O
special	O
recognition	O
award	O
from	O
Canada	O
's	O
Telecommunications	O
Hall	O
of	O
Fame	O
for	O
its	O
role	O
in	O
pioneering	O
digital	O
communications	O
with	O
the	O
Digital	B-Protocol
Multiplex	I-Protocol
System	I-Protocol
.	O
</s>
<s>
The	O
product	O
was	O
intended	O
as	O
a	O
successor	O
for	O
Nortel	O
's	O
first	O
electronic	O
switch	O
,	O
the	O
SP1	B-Device
,	O
and	O
was	O
to	O
be	O
called	O
the	O
SP2	O
.	O
</s>
<s>
However	O
the	O
DMS	O
acronym	O
was	O
mellifluous	O
and	O
was	O
eventually	O
(	O
1975	O
)	O
adopted	O
as	O
the	O
designation	O
for	O
the	O
DMS-10	B-Protocol
and	O
DMS-100	B-Protocol
family	O
of	O
products	O
,	O
with	O
the	O
"	O
S	O
"	O
standing	O
for	O
"	O
system	O
"	O
rather	O
than	O
"	O
switch	O
"	O
.	O
</s>
<s>
The	O
DMS-10	B-Protocol
is	O
widely	O
used	O
by	O
rural	O
wireline	O
providers	O
.	O
</s>
<s>
DMS-100	B-Protocol
and	O
200	O
switches	O
are	O
widely	O
deployed	O
throughout	O
the	O
U.S.	O
and	O
Canada	O
by	O
Regional	O
Bell	O
Operating	O
Companies	O
,	O
Bell	O
Canada	O
and	O
independent	O
telephone	O
companies	O
as	O
well	O
as	O
the	O
US	O
Military	O
.	O
</s>
<s>
The	O
DMS-250	B-Protocol
is	O
the	O
backbone	O
of	O
a	O
number	O
of	O
carriers	O
 '	O
long-distance	O
networks	O
.	O
</s>
<s>
The	O
DMS-300	O
is	O
an	O
international	O
gateway	O
switch	O
,	O
and	O
the	O
DMS-500	O
is	O
commonly	O
deployed	O
by	O
competitive	O
local	O
exchange	O
carriers	O
because	O
it	O
combines	O
DMS-100	B-Protocol
and	O
250	O
capabilities	O
.	O
</s>
