<s>
A	O
registered	B-Protocol
jack	I-Protocol
(	O
RJ	O
)	O
is	O
a	O
standardized	O
telecommunication	O
network	B-Protocol
interface	I-Protocol
for	O
connecting	O
voice	O
and	O
data	O
equipment	O
to	O
a	O
service	O
provided	O
by	O
a	O
local	O
exchange	O
carrier	O
or	O
long	O
distance	O
carrier	O
.	O
</s>
<s>
Registered	B-Protocol
jack	I-Protocol
connections	O
began	O
to	O
see	O
use	O
after	O
their	O
invention	O
in	O
1973	O
by	O
Bell	O
Labs	O
.	O
</s>
<s>
Accordingly	O
,	O
registered	B-Protocol
jacks	I-Protocol
are	O
primarily	O
named	O
by	O
the	O
letters	O
RJ	O
,	O
followed	O
by	O
two	O
digits	O
that	O
express	O
the	O
type	O
.	O
</s>
<s>
The	O
connectors	O
used	O
for	O
registered	B-Protocol
jack	I-Protocol
installations	O
are	O
primarily	O
the	O
modular	B-Architecture
connector	I-Architecture
and	O
the	O
50-pin	O
miniature	B-Protocol
ribbon	I-Protocol
connector	I-Protocol
.	O
</s>
<s>
For	O
example	O
,	O
RJ11	O
uses	O
a	O
six-position	O
two-conductor	O
connector	O
(	O
6P2C	O
)	O
,	O
RJ14	O
uses	O
a	O
six-position	O
four-conductor	O
(	O
6P4C	O
)	O
modular	B-Architecture
jack	I-Architecture
,	O
while	O
RJ21	O
uses	O
a	O
25-pair	O
(	O
50-pin	O
)	O
miniature	B-Protocol
ribbon	I-Protocol
connector	I-Protocol
.	O
</s>
<s>
The	O
registered	B-Protocol
jack	I-Protocol
designations	O
originated	O
in	O
the	O
standardization	O
process	O
of	O
telephone	O
connections	O
in	O
the	O
Bell	O
System	O
in	O
the	O
United	O
States	O
,	O
and	O
describe	O
application	O
circuits	O
and	O
not	O
just	O
the	O
physical	O
geometry	O
of	O
the	O
connectors	O
.	O
</s>
<s>
The	O
same	O
modular	B-Architecture
connector	I-Architecture
type	O
may	O
be	O
used	O
for	O
different	O
registered	B-Protocol
jack	I-Protocol
applications	O
.	O
</s>
<s>
Modular	B-Architecture
connectors	I-Architecture
were	O
developed	O
to	O
replace	O
older	O
telephone	O
installation	O
methods	O
that	O
used	O
hardwired	O
cords	O
or	O
bulkier	O
varieties	O
of	O
telephone	B-Protocol
plugs	I-Protocol
.	O
</s>
<s>
Strictly	O
,	O
Registered	B-Protocol
Jack	I-Protocol
refers	O
to	O
both	O
the	O
female	O
physical	O
connector	O
(	O
modular	B-Architecture
connector	I-Architecture
)	O
and	O
specific	O
wiring	O
patterns	O
,	O
but	O
the	O
term	O
is	O
often	O
used	O
loosely	O
to	O
refer	O
to	O
modular	B-Architecture
connectors	I-Architecture
regardless	O
of	O
wiring	O
,	O
gender	O
,	O
or	O
use	O
,	O
commonly	O
for	O
telephone	O
line	O
connections	O
,	O
but	O
also	O
for	O
Ethernet	B-Protocol
over	I-Protocol
twisted	I-Protocol
pair	I-Protocol
,	O
resulting	O
in	O
confusion	O
over	O
the	O
various	O
connection	O
standards	O
and	O
applications	O
.	O
</s>
<s>
The	O
RJ	O
standards	O
designations	O
only	O
pertain	O
to	O
the	O
wiring	O
of	O
the	O
(	O
female	O
)	O
jacks	O
,	O
hence	O
the	O
name	O
Registered	B-Protocol
Jack	I-Protocol
.	O
</s>
<s>
It	O
is	O
commonplace	O
,	O
but	O
not	O
strictly	O
correct	O
,	O
to	O
refer	O
to	O
the	O
unwired	O
connectors	O
or	O
the	O
(	O
male	O
)	O
plugs	B-Protocol
by	O
these	O
names	O
.	O
</s>
<s>
The	O
nomenclature	O
for	O
modular	B-Architecture
connectors	I-Architecture
is	O
based	O
on	O
the	O
number	O
of	O
contact	B-Protocol
positions	O
and	O
the	O
number	O
of	O
wires	O
connected	O
.	O
</s>
<s>
6P	O
indicates	O
a	O
six-position	O
modular	B-Architecture
plug	I-Architecture
or	O
jack	O
.	O
</s>
<s>
A	O
six-position	O
modular	B-Architecture
plug	I-Architecture
with	O
conductors	O
in	O
only	O
the	O
middle	O
two	O
positions	O
is	O
designated	O
6P2C	O
;	O
6P4C	O
has	O
four	O
conductors	O
in	O
the	O
middle	O
positions	O
,	O
and	O
6P6C	O
has	O
all	O
six	O
equipped	O
.	O
</s>
<s>
Registration	O
interfaces	O
were	O
created	O
by	O
the	O
Bell	O
System	O
under	O
a	O
Federal	O
Communications	O
Commission	O
order	O
for	O
the	O
standard	O
interconnection	B-Architecture
between	O
telephone	O
company	O
equipment	O
and	O
customer	O
premises	O
equipment	O
.	O
</s>
<s>
These	O
interfaces	O
used	O
newly	O
standardized	O
jacks	O
and	O
plugs	B-Protocol
,	O
primarily	O
based	O
on	O
miniature	O
modular	B-Architecture
connectors	I-Architecture
.	O
</s>
<s>
The	O
wired	O
communications	O
provider	O
(	O
telephone	O
company	O
)	O
is	O
responsible	O
for	O
delivery	O
of	O
services	O
to	O
a	O
minimum	O
(	O
or	O
main	O
)	O
point	O
of	O
entry	O
(	O
MPOE	B-Architecture
)	O
.	O
</s>
<s>
The	O
MPOE	B-Architecture
is	O
a	O
utility	O
box	O
,	O
usually	O
containing	O
surge	O
protective	O
circuitry	O
,	O
which	O
connects	O
the	O
wiring	O
on	O
the	O
customer	O
's	O
property	O
to	O
the	O
communication	O
provider	O
's	O
network	O
.	O
</s>
<s>
Customers	O
are	O
responsible	O
for	O
all	O
jacks	O
,	O
wiring	O
,	O
and	O
equipment	O
on	O
their	O
side	O
of	O
the	O
MPOE	B-Architecture
.	O
</s>
<s>
In	O
the	O
Bell	O
System	O
,	O
following	O
the	O
Communications	O
Act	O
of	O
1934	O
,	O
the	O
telephone	O
companies	O
owned	O
all	O
telecommunications	O
equipment	O
and	O
they	O
did	O
not	O
allow	O
interconnection	B-Architecture
of	O
third-party	O
equipment	O
.	O
</s>
<s>
The	O
legal	O
case	O
Hush-A-Phone	O
v	O
.	O
United	O
States	O
(	O
1956	O
)	O
and	O
the	O
Federal	O
Communications	O
Commission	O
's	O
(	O
FCC	O
)	O
Carterfone	O
(	O
1968	O
)	O
decision	O
brought	O
changes	O
to	O
this	O
policy	O
,	O
and	O
required	O
the	O
Bell	O
System	O
to	O
allow	O
some	O
interconnection	B-Architecture
,	O
culminating	O
in	O
the	O
development	O
of	O
registered	O
interfaces	O
using	O
new	O
types	O
of	O
miniature	O
connectors	O
.	O
</s>
<s>
Registered	B-Protocol
jacks	I-Protocol
replaced	O
the	O
use	O
of	O
protective	O
couplers	O
provided	O
exclusively	O
by	O
the	O
telephone	O
company	O
.	O
</s>
<s>
The	O
new	O
modular	B-Architecture
connectors	I-Architecture
were	O
much	O
smaller	O
and	O
cheaper	O
to	O
produce	O
than	O
the	O
earlier	O
,	O
bulkier	O
connectors	O
that	O
were	O
used	O
in	O
the	O
Bell	O
System	O
since	O
the	O
1930s	O
.	O
</s>
<s>
The	O
Bell	O
System	O
issued	O
specifications	O
for	O
the	O
modular	B-Architecture
connectors	I-Architecture
and	O
their	O
wiring	O
as	O
Universal	O
Service	O
Order	O
Codes	O
(	O
USOC	O
)	O
,	O
which	O
were	O
the	O
only	O
standards	O
at	O
the	O
time	O
.	O
</s>
<s>
Large	O
customers	O
of	O
telephone	O
services	O
commonly	O
use	O
the	O
USOC	O
to	O
specify	O
the	O
interconnection	B-Architecture
type	O
and	O
,	O
when	O
necessary	O
,	O
pin-assignments	O
,	O
when	O
placing	O
service	O
orders	O
with	O
a	O
network	O
provider	O
.	O
</s>
<s>
When	O
the	O
U.S.	O
telephone	O
industry	O
was	O
reformed	O
to	O
foster	O
competition	O
in	O
the	O
1980s	O
,	O
the	O
connection	O
specifications	O
became	O
federal	O
law	O
,	O
ordered	O
by	O
the	O
FCC	O
and	O
codified	O
in	O
the	O
Code	O
of	O
Federal	O
Regulations	O
(	O
CFR	O
)	O
,	O
Title	O
47	O
CFR	O
Part	O
68	O
,	O
Subpart	O
F	O
,	O
FCC	O
47	O
CFR	O
Part	O
68	O
Connection	O
of	O
Terminal	O
Equipment	O
to	O
the	O
Telephone	O
Network	O
,	O
Section	O
68.502	O
superseded	O
by	O
T1.TR5-1999	O
superseded	O
by	O
T1.TR5-1999	O
.	O
</s>
<s>
TIA-968-A	O
,	O
the	O
current	O
version	O
of	O
that	O
standard	O
,	O
details	O
the	O
physical	O
aspects	O
of	O
modular	B-Architecture
connectors	I-Architecture
,	O
but	O
not	O
the	O
wiring	O
.	O
</s>
<s>
Instead	O
,	O
TIA-968-A	O
incorporates	O
the	O
standard	O
T1.TR5-1999	O
,	O
"	O
Network	O
and	O
Customer	O
Installation	O
Interface	O
Connector	O
Wiring	O
Configuration	O
Catalog	O
"	O
,	O
T1.TR5-1999	O
Network	O
and	O
Customer	O
Installation	O
Interface	O
Connector	O
Wiring	O
Configuration	O
Catalog	O
by	O
reference	O
.	O
</s>
<s>
A	O
registered	B-Protocol
jack	I-Protocol
name	O
,	O
such	O
as	O
RJ11	O
,	O
still	O
identifies	O
both	O
the	O
physical	O
connectors	O
and	O
the	O
wiring	O
(	O
pinout	O
)	O
for	O
each	O
application	O
.	O
</s>
<s>
The	O
most	O
widely	O
implemented	O
registered	B-Protocol
jack	I-Protocol
in	O
telecommunications	O
is	O
the	O
RJ11	O
.	O
</s>
<s>
This	O
is	O
a	O
modular	B-Architecture
connector	I-Architecture
wired	O
for	O
one	O
telephone	O
line	O
,	O
using	O
the	O
center	O
two	O
contacts	O
of	O
six	O
available	O
positions	O
.	O
</s>
<s>
RJ61	O
is	O
a	O
similar	O
registered	B-Protocol
jack	I-Protocol
for	O
four	O
lines	O
,	O
but	O
uses	O
an	O
8P8C	O
connector	O
.	O
</s>
<s>
The	O
RJ45S	O
jack	O
is	O
rarely	O
used	O
in	O
telephone	O
applications	O
but	O
a	O
standard	O
version	O
of	O
the	O
8P8C	O
modular	B-Architecture
connector	I-Architecture
used	O
by	O
RJ45S	O
is	O
used	O
in	O
Ethernet	O
networks	O
and	O
the	O
connector	O
is	O
often	O
referred	O
to	O
as	O
RJ45	O
in	O
this	O
context	O
.	O
</s>
<s>
+	O
Officially	O
recognized	O
types	O
of	O
registered	B-Protocol
jacks	I-Protocol
Code	O
Connector	O
Usage	O
RJA1X	O
225A	O
adapter	O
Connector	O
for	O
a	O
modular	B-Architecture
plug	I-Architecture
to	O
a	O
four-prong	O
jack	O
RJA2X	O
267A	O
adapter	O
Connector	O
for	O
splitting	O
one	O
modular	B-Architecture
jack	I-Architecture
to	O
two	O
modular	B-Architecture
jacks	I-Architecture
RJA3X	O
224A	O
adapter	O
Connector	O
for	O
adapting	O
a	O
modular	B-Architecture
plug	I-Architecture
to	O
a	O
12-prong	O
jack	O
RJ2MB	O
50-pin	O
2	O
–	O
12	O
telephone	O
lines	O
with	O
make-busy	O
arrangement	O
RJ11( 	O
C/W	O
)	O
6P2C	O
Establishes	O
a	O
bridged	O
connection	O
for	O
one	O
telephone	O
line	O
(	O
6P4C	O
if	O
power	O
on	O
second	O
pair	O
)	O
RJ12( 	O
C/W	O
)	O
6P6C	O
Establishes	O
a	O
bridged	O
connection	O
for	O
one	O
telephone	O
line	O
with	O
key	O
telephone	O
system	O
control	O
ahead	O
of	O
line	O
circuit	O
RJ13( 	O
C/W	O
)	O
6P4C	O
Similar	O
to	O
RJ12	O
,	O
but	O
behind	O
the	O
line	O
circuit	O
RJ14( 	O
C/W	O
)	O
6P4C	O
For	O
two	O
telephone	O
lines	O
(	O
6P6C	O
if	O
power	O
on	O
third	O
pair	O
)	O
RJ15C	O
3-pin	O
weatherproof	O
For	O
one	O
telephone	O
line	O
for	O
boats	O
in	O
marinas	O
RJ18( 	O
C/W	O
)	O
6P6C	O
For	O
one	O
telephone	O
line	O
with	O
make-busy	O
arrangement	O
RJ21X	O
50-pin	O
Multiple	O
(	O
up	O
to	O
25	O
)	O
line	O
bridged	O
T/R	O
configuration	O
RJ25( 	O
C/W	O
)	O
6P6C	O
For	O
three	O
telephone	O
lines	O
RJ26X	O
50-pin	O
For	O
multiple	O
data	O
lines	O
,	O
universal	O
RJ27X	O
50-pin	O
For	O
multiple	O
data	O
lines	O
,	O
programmed	O
RJ31X	O
8P8C	O
Allows	O
an	O
alarm	O
system	O
to	O
seize	O
the	O
telephone	O
line	O
to	O
make	O
an	O
outgoing	O
call	O
during	O
an	O
alarm	O
.	O
</s>
<s>
Jack	O
is	O
placed	O
closer	O
to	O
the	O
network	B-Protocol
interface	I-Protocol
than	O
all	O
other	O
equipment	O
.	O
</s>
<s>
RJ41S	O
8P8C	O
,	O
keyed	O
For	O
one	O
data	O
line	O
,	O
universal	O
(	O
fixed	O
loop	O
loss	O
and	O
programmed	O
)	O
RJ45S	O
8P8C	O
,	O
keyed	O
For	O
one	O
data	O
line	O
,	O
with	O
programming	O
resistor	O
RJ48C	O
8P4C	O
For	O
four-wire	O
data	O
line	O
(	O
DSX-1	O
)	O
RJ48S	O
8P4C	O
,	O
keyed	O
For	O
four-wire	O
data	O
line	O
(	O
DDS	O
)	O
RJ48X	O
8P4C	O
with	O
shorting	O
bar	O
For	O
four-wire	O
data	O
line	O
(	O
DS1	O
)	O
RJ49C	O
8P8C	O
For	O
ISDN	B-Protocol
BRI	O
via	O
NT1	O
RJ61X	O
8P8C	O
For	O
four	O
telephone	O
lines	O
RJ71C	O
50-pin	O
12-line	O
series	O
connection	O
using	O
50-pin	O
connector	O
(	O
with	O
bridging	O
adapter	O
)	O
ahead	O
of	O
customer	O
equipment	O
.	O
</s>
<s>
All	O
of	O
these	O
registered	B-Protocol
jacks	I-Protocol
are	O
described	O
as	O
containing	O
a	O
number	O
of	O
potential	O
contact	B-Protocol
positions	O
and	O
the	O
actual	O
number	O
of	O
contacts	O
installed	O
within	O
these	O
positions	O
.	O
</s>
<s>
RJ11	O
,	O
RJ14	O
,	O
and	O
RJ25	O
all	O
use	O
the	O
same	O
six-position	O
modular	B-Architecture
connector	I-Architecture
,	O
thus	O
are	O
physically	O
identical	O
except	O
for	O
the	O
different	O
number	O
of	O
contacts	O
(	O
two	O
,	O
four	O
and	O
six	O
respectively	O
)	O
allowing	O
connections	O
for	O
one	O
,	O
two	O
,	O
or	O
three	O
telephone	O
lines	O
respectively	O
.	O
</s>
<s>
Two	O
of	O
the	O
six	O
possible	O
contact	B-Protocol
positions	O
connect	O
tip	O
and	O
ring	O
,	O
and	O
the	O
other	O
two	O
conductors	O
are	O
unused	O
.	O
</s>
<s>
The	O
conductors	O
other	O
than	O
the	O
two	O
central	O
tip	O
and	O
ring	O
conductors	O
are	O
in	O
practice	O
variously	O
used	O
for	O
a	O
second	O
or	O
third	O
telephone	O
line	O
,	O
a	O
ground	O
for	O
selective	B-Architecture
ringers	I-Architecture
,	O
low-voltage	O
power	O
for	O
a	O
dial	O
light	O
,	O
or	O
for	O
anti-tinkle	O
circuitry	O
to	O
prevent	O
pulse	O
dialing	O
phones	O
from	O
sounding	O
the	O
bell	O
on	O
other	O
extensions	O
.	O
</s>
<s>
RJ21	O
is	O
a	O
registered	B-Protocol
jack	I-Protocol
standard	O
using	O
a	O
modular	B-Architecture
connector	I-Architecture
with	O
contacts	O
for	O
up	O
to	O
fifty	O
conductors	O
.	O
</s>
<s>
The	O
miniature	B-Protocol
ribbon	I-Protocol
connector	I-Protocol
of	O
this	O
interface	O
is	O
also	O
known	O
as	O
a	O
50-pin	O
telco	O
connector	O
,	O
CHAMP(AMP )	O
,	O
or	O
Amphenol	O
connector	O
,	O
the	O
latter	O
being	O
a	O
genericized	O
trademark	O
,	O
as	O
Amphenol	O
was	O
a	O
prominent	O
manufacturer	O
of	O
these	O
at	O
one	O
time	O
.	O
</s>
<s>
Dual	O
50-pin	O
ribbon	O
connectors	O
are	O
often	O
used	O
on	O
punch	B-Protocol
blocks	I-Protocol
to	O
create	O
a	O
breakout	B-Protocol
box	I-Protocol
for	O
private	B-Device
branch	I-Device
exchange	I-Device
(	O
PBX	O
)	O
and	O
other	O
key	O
telephone	O
systems	O
.	O
</s>
<s>
The	O
original	O
RJ45S	O
keyed	O
8P2C	O
modular	B-Architecture
connector	I-Architecture
had	O
pins	O
5	O
and	O
4	O
wired	O
for	O
tip	O
and	O
ring	O
of	O
a	O
single	O
telephone	O
line	O
,	O
and	O
pins	O
7	O
and	O
8	O
shorting	O
a	O
programming	O
resistor	O
,	O
but	O
is	O
obsolete	O
today	O
.	O
</s>
<s>
RJ48	O
is	O
a	O
registered	B-Protocol
jack	I-Protocol
.	O
</s>
<s>
It	O
is	O
used	O
for	O
T1	B-Protocol
and	O
ISDN	B-Protocol
termination	O
and	O
local	O
area	O
data	O
channels	O
or	O
subrate	O
digital	O
services	O
.	O
</s>
<s>
It	O
uses	O
the	O
eight-position	O
modular	B-Architecture
connector	I-Architecture
(	O
8P8C	O
)	O
.	O
</s>
<s>
RJ48C	O
is	O
commonly	O
used	O
for	O
T1	B-Protocol
circuits	I-Protocol
and	O
uses	O
pin	O
numbers	O
1	O
,	O
2	O
,	O
4	O
and	O
5	O
.	O
</s>
<s>
It	O
uses	O
a	O
keyed	O
variety	O
of	O
the	O
8P8C	O
modular	B-Architecture
connector	I-Architecture
.	O
</s>
<s>
RJ61	O
is	O
a	O
physical	B-Protocol
interface	I-Protocol
often	O
used	O
for	O
terminating	O
twisted	O
pair	O
type	O
cables	O
.	O
</s>
<s>
It	O
uses	O
an	O
eight	O
position	O
,	O
eight	O
conductor	O
(	O
8P8C	O
)	O
modular	B-Architecture
connector	I-Architecture
.	O
</s>
<s>
T1	B-Protocol
lines	I-Protocol
use	O
another	O
wiring	O
for	O
the	O
same	O
connector	O
,	O
designated	O
RJ48	O
.	O
</s>
<s>
Ethernet	B-Protocol
over	I-Protocol
twisted	I-Protocol
pair	I-Protocol
(	O
10BASE-T	B-Protocol
,	O
100BASE-TX	B-Protocol
and	O
1000BASE-T	O
)	O
also	O
use	O
a	O
different	O
wiring	O
for	O
the	O
same	O
connector	O
,	O
either	O
T568A	O
or	O
T568B	O
.	O
</s>
<s>
The	O
labels	O
RJ9	O
,	O
RJ10	O
,	O
RJ22	O
are	O
variously	O
used	O
for	O
4P4C	O
and	O
4P2C	O
modular	B-Architecture
connectors	I-Architecture
,	O
most	O
typically	O
installed	O
on	O
telephone	O
handsets	O
and	O
their	O
cordage	O
.	O
</s>
<s>
Telephone	O
handsets	O
do	O
not	O
connect	O
directly	O
to	O
the	O
public	O
network	O
,	O
and	O
therefore	O
have	O
no	O
registered	B-Protocol
jack	I-Protocol
designation.RJ45	O
is	O
often	O
incorrectly	O
used	O
when	O
referring	O
to	O
an	O
8P8C	O
connector	O
used	O
for	O
ANSI/TIA	O
-568	O
T568A	O
and	O
T568B	O
and	O
Ethernet	O
.	O
</s>
<s>
It	O
is	O
distinct	O
from	O
the	O
official	O
RJ45S	O
and	O
ARJ45	B-Device
interfaces.RJ50	O
''	O
is	O
often	O
a	O
10P10C	O
interface	O
,	O
often	O
used	O
for	O
data	O
applications	O
.	O
</s>
<s>
The	O
micro	B-Protocol
ribbon	I-Protocol
connector	I-Protocol
,	O
first	O
made	O
by	O
Amphenol	O
,	O
that	O
is	O
used	O
in	O
the	O
RJ21	O
interface	O
,	O
has	O
also	O
been	O
used	O
to	O
connect	O
Ethernet	O
ports	O
in	O
bulk	O
from	O
a	O
switch	O
with	O
50-pin	O
ports	O
to	O
a	O
Cat-5	B-Protocol
rated	O
patch	B-Protocol
panel	I-Protocol
,	O
or	O
between	O
two	O
patch	B-Protocol
panels	I-Protocol
.	O
</s>
<s>
A	O
cable	O
with	O
a	O
50-pin	O
connector	O
on	O
one	O
end	O
can	O
support	O
six	O
fully	O
wired	O
8P8C	O
connectors	O
or	O
Ethernet	O
ports	O
on	O
a	O
patch	B-Protocol
panel	I-Protocol
with	O
one	O
spare	O
pair	O
.	O
</s>
<s>
Alternatively	O
,	O
only	O
the	O
necessary	O
pairs	O
for	O
10/100	B-Protocol
Ethernet	I-Protocol
can	O
be	O
wired	O
allowing	O
twelve	O
Ethernet	O
ports	O
with	O
a	O
single	O
spare	O
pair	O
.	O
</s>
<s>
Some	O
computer	O
printers	O
use	O
a	O
shorter	O
36-pin	O
version	O
known	O
as	O
a	O
Centronics	B-Protocol
connector	I-Protocol
.	O
</s>
<s>
The	O
8P8C	O
modular	B-Architecture
jack	I-Architecture
was	O
chosen	O
as	O
a	O
candidate	O
for	O
ISDN	B-Protocol
systems	O
.	O
</s>
<s>
Under	O
the	O
rules	O
of	O
the	O
IEEE	O
802	O
standards	O
project	O
,	O
international	O
standards	O
are	O
to	O
be	O
preferred	O
over	O
national	O
standards	O
,	O
so	O
when	O
the	O
original	O
10BASE-T	B-Protocol
twisted-pair	O
wiring	O
version	O
of	O
Ethernet	O
was	O
developed	O
,	O
this	O
modular	B-Architecture
connector	I-Architecture
was	O
chosen	O
as	O
the	O
basis	O
for	O
IEEE	O
802.3i-1990	O
.	O
</s>
