<s>
A	O
dock	B-Operating_System
connector	I-Operating_System
is	O
a	O
connector	O
used	O
to	O
attach	O
a	O
mobile	O
electronic	O
device	O
simultaneously	O
to	O
multiple	O
external	O
resources	O
.	O
</s>
<s>
The	O
dock	B-Operating_System
connector	I-Operating_System
will	O
typically	O
carry	O
a	O
variety	O
of	O
signals	O
and	O
power	O
,	O
through	O
a	O
single	O
connector	O
,	O
to	O
simplify	O
the	O
process	O
of	O
docking	O
the	O
mobile	B-Application
device	I-Application
.	O
</s>
<s>
A	O
dock	B-Operating_System
connector	I-Operating_System
may	O
be	O
embedded	O
in	O
a	O
mechanical	O
fixture	O
used	O
to	O
support	O
or	O
align	O
the	O
mobile	B-Application
device	I-Application
or	O
may	O
be	O
at	O
the	O
end	O
of	O
a	O
cable	O
.	O
</s>
<s>
The	O
dock	B-Operating_System
connector	I-Operating_System
was	O
originally	O
associated	O
with	O
laptops	B-Device
,	O
but	O
other	O
mobile	B-Application
devices	I-Application
use	O
the	O
concept	O
.	O
</s>
<s>
Classic	O
docking	O
connectors	O
for	O
laptop	B-Device
computers	I-Device
are	O
usually	O
embedded	O
into	O
a	O
mechanical	O
docking	B-Device
station	I-Device
and	O
port	B-Device
replicator	I-Device
devices	O
that	O
supports	O
and	O
aligns	O
the	O
laptop	B-Device
and	O
sports	O
various	O
single-function	O
ports	O
and	O
a	O
power	O
source	O
that	O
are	O
aggregated	O
into	O
the	O
docking	O
connector	O
.	O
</s>
<s>
Docking	O
connectors	O
would	O
carry	O
interfaces	O
such	O
as	O
keyboard	B-Device
,	O
serial	B-Protocol
,	O
parallel	B-Device
,	O
and	O
video	B-Protocol
ports	I-Protocol
from	O
the	O
laptop	B-Device
and	O
supply	O
power	O
to	O
it	O
.	O
</s>
<s>
Current	O
docking	O
connection	O
options	O
usually	O
can	O
be	O
defined	O
as	O
a	O
USB-C	O
port	O
with	O
optional	O
additional	O
functionality	O
.	O
</s>
<s>
Many	O
mobile	B-Application
devices	I-Application
feature	O
a	O
dock	B-Operating_System
connector	I-Operating_System
.	O
</s>
<s>
Dock	B-Operating_System
connectors	I-Operating_System
can	O
be	O
used	O
to	O
interface	O
with	O
accessories	O
such	O
as	O
external	O
speakers	O
,	O
including	O
stereo	O
systems	O
and	O
clock	O
radios	O
.	O
</s>
<s>
Automotive	O
accessories	O
for	O
mobile	B-Application
devices	I-Application
include	O
charging	O
cradles	O
,	O
FM	O
transmitters	O
for	O
playing	O
audio	O
through	O
the	O
car	O
's	O
speakers	O
,	O
and	O
GPS	O
receivers	O
.	O
</s>
<s>
There	O
are	O
dock	B-Operating_System
connector	I-Operating_System
cables	O
that	O
offer	O
additional	O
capabilities	O
such	O
as	O
direct	O
integration	O
with	O
the	O
car	O
's	O
audio	O
system	O
and	O
controls	O
.	O
</s>
<s>
Apple	O
's	O
proprietary	O
30-pin	O
connector	O
was	O
common	O
to	O
most	O
Apple	O
mobile	B-Application
devices	I-Application
(	O
iPhone	B-Operating_System
(	O
1st	B-Operating_System
generation	I-Operating_System
)	O
,	O
3G	B-Operating_System
,	O
3GS	B-Operating_System
,	O
4	B-Operating_System
,	O
4S	B-Operating_System
)	O
,	O
1st	O
through	O
4th	O
generation	O
iPod	B-Device
Touch	I-Device
,	O
iPad	B-Device
,	O
iPad	B-Operating_System
2	I-Operating_System
,	O
and	O
iPad	B-Operating_System
3rd	I-Operating_System
gen	I-Operating_System
)	O
from	O
its	O
introduction	O
with	O
the	O
3rd	O
generation	O
iPod	B-Operating_System
classic	I-Operating_System
in	O
2003	O
until	O
the	O
Lightning	B-Architecture
connector	I-Architecture
was	O
released	O
in	O
late	O
2012	O
.	O
</s>
<s>
Originally	O
,	O
the	O
Apple	O
dock	B-Operating_System
connector	I-Operating_System
carried	O
USB	B-Protocol
,	O
FireWire	B-Protocol
,	O
some	O
controls	O
and	O
line-level	O
audio	O
outputs	O
.	O
</s>
<s>
As	O
the	O
iPod	B-Operating_System
changed	O
,	O
so	O
did	O
the	O
signals	O
in	O
the	O
dock	B-Operating_System
connector	I-Operating_System
.	O
</s>
<s>
Video	B-Protocol
was	O
added	O
to	O
the	O
connector	O
.	O
</s>
<s>
FireWire	B-Protocol
was	O
phased	O
out	O
of	O
the	O
iPods	B-Operating_System
,	O
which	O
led	O
to	O
a	O
discontinuity	O
in	O
usage	O
of	O
the	O
dock	B-Operating_System
connector	I-Operating_System
.	O
</s>
<s>
As	O
a	O
result	O
of	O
the	O
popularity	O
of	O
Apple	O
's	O
iPod	B-Operating_System
and	O
iPhone	B-Operating_System
devices	O
using	O
the	O
connector	O
,	O
a	O
cottage	O
industry	O
was	O
created	O
of	O
third-party	O
devices	O
that	O
could	O
connect	O
to	O
the	O
interface	O
.	O
</s>
<s>
With	O
the	O
discontinuation	O
of	O
the	O
sixth-generation	O
160	O
GB	O
iPod	B-Operating_System
Classic	I-Operating_System
and	O
the	O
iPhone	B-Operating_System
4S	I-Operating_System
,	O
the	O
last	O
Apple	O
products	O
to	O
feature	O
the	O
original	O
30-pin	O
connector	O
,	O
the	O
connector	O
was	O
discontinued	O
in	O
September	O
2014	O
but	O
the	O
production	O
of	O
30-pin	O
connectors	O
in	O
India	O
and	O
developing	O
markets	O
still	O
continued	O
until	O
February	O
2016	O
.	O
</s>
<s>
Apple	O
introduced	O
an	O
8-pin	O
dock	B-Operating_System
connector	I-Operating_System
,	O
named	O
Lightning	B-Architecture
,	O
on	O
September	O
12	O
,	O
2012	O
,	O
as	O
replacement	O
of	O
the	O
30-pin	O
dock	B-Operating_System
connector	I-Operating_System
.	O
</s>
<s>
The	O
iPhone	B-Operating_System
5	I-Operating_System
and	O
later	O
,	O
the	O
fifth	O
-	O
to	O
seventh-generation	O
iPod	B-Device
touch	I-Device
,	O
seventh-generation	O
iPod	B-Device
nano	I-Device
,	O
first	O
-	O
to	O
sixth-generation	O
iPad	B-Device
mini	I-Device
,	O
the	O
fourth	O
-	O
to	O
ninth-generation	O
iPad	B-Device
,	O
the	O
first	O
-	O
to	O
third-generation	O
iPad	B-Operating_System
Air	I-Operating_System
,	O
and	O
the	O
first	O
-	O
and	O
second-generation	O
of	O
the	O
iPad	B-Device
Pro	I-Device
used	O
the	O
Lightning	B-Architecture
connector	I-Architecture
,	O
as	O
do	O
several	O
Apple	O
accessories	O
.	O
</s>
<s>
Apple	B-Architecture
Lightning	I-Architecture
connector	O
pins	O
can	O
be	O
accessed	O
from	O
both	O
sides	O
of	O
the	O
connector	O
allowing	O
reversibility	O
.	O
</s>
<s>
The	O
Samsung	B-Device
Galaxy	I-Device
Tab	I-Device
and	O
Galaxy	B-Application
Note	I-Application
30-pin	O
dock/charging	O
connector	O
is	O
very	O
similar	O
to	O
–	O
although	O
not	O
identical	O
with	O
–	O
the	O
non-proprietary	O
PDMI	B-Protocol
connector	I-Protocol
.	O
</s>
<s>
The	O
2007	O
updated	O
version	O
has	O
only	O
20	O
pins	O
but	O
added	O
composite	O
video	B-Protocol
output	O
support	O
among	O
other	O
changes	O
.	O
</s>
<s>
The	O
Portable	O
Digital	O
Media	O
Interface	O
(	O
PDMI	B-Protocol
)	O
is	O
a	O
30-pin	O
interconnection	O
standard	O
for	O
portable	O
media	O
players	O
.	O
</s>
<s>
The	O
WM-PORT	O
is	O
a	O
22-pin	O
dock	B-Operating_System
connector	I-Operating_System
from	O
Sony	O
,	O
used	O
for	O
the	O
majority	O
of	O
Walkman	O
digital	O
media	O
players	O
since	O
2006	O
.	O
</s>
