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If you're connecting a
telephone or an analog modem
-
to your Plain Old Telephone
System, or your POTS system,
-
then you're probably
using this RJ11 connector.
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This is what we technically call
a six-position two-conductor
-
connector.
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That means there are six
places for wires inside
-
of this connector, but
we're really only using
-
two of those conductors.
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As you can see in this cable--
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that it has this RJ11
connection at the end.
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You might find some
of the RJ11 cables
-
that you're using for your
modem or your telephone actually
-
have four wires inside of them
with four different conductors.
-
That six-position four
conductor is technically
-
an RJ14 connector, but it has
exactly the same connector
-
on the end.
-
And we often use these
cables interchangeably.
-
With a separate
set of conductors
-
or separate set of wires
inside of this cable,
-
we're able to use this
single cable for dual line
-
use for someone who might have
two telephones on their desk.
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Here's the connection
that is inside
-
the modem or inside of the
device that's connecting
-
to this RJ11 connection.
-
And you can see
the two conductors
-
that are inside
of that connector
-
when you plug in the
RJ11 modular connector.
-
A connector that's a little bit
wider than an RJ11 is an RJ45.
-
This is the type of
connector you commonly
-
see associated with a
wired Ethernet connection.
-
This is an eight-position
eight-conductor connection,
-
which means we have all eight of
those connectors and all eight
-
of those wires that are being
used inside of that cable.
-
This is also similar
to a format you
-
might see called an RJ48C,
which has an eight-position four
-
conductor.
-
Those are commonly seen
with T1 or wide area network
-
connections.
-
An RS-232 connection stands
for Recommended Standard 232.
-
This is a serial connection
type that has literally
-
been around since 1969.
-
And it has been around
so long because it's
-
able to connect to so many
different kinds of devices.
-
Before there was
USB-type connectivity,
-
we commonly used RS-232
to connect our mouse
-
connections, our printers, our
networks, and other devices
-
as well.
-
These days, RS-232
is commonly used
-
as a configuration
port on a switch
-
or a router or a
firewall, and it's
-
plugging into a serial
interface on a laptop
-
or another computer.
-
The 25-pin version of RS-232 is
usually referred to as a DB25.
-
This nine-pin connection,
which is a bit more modern,
-
you'll sometimes hear
referred to as a DB9.
-
But, technically,
it's the smaller style
-
of D-subminiature interface,
which is the E side.
-
So you may see this
nine-pin connection being
-
referred to as DB9 or DE9.
-
It's really referring to
exactly the same connection.
-
A very common type of
coaxial cable connection
-
is a BNC connection.
-
The B in BNC stands
for Bayonet, which
-
is the style of cable that plugs
in and then twists to lock.
-
And you can see the locking
mechanism on the cable
-
right here.
-
The N and the C in BNC
stands for Paul Neill,
-
who is at Bell Labs, and Carl
Concelman, who is at Amphenol.
-
They designed this
particular connection
-
and called it the
BNC connection.
-
As I mentioned, this
is commonly seen
-
on coax connections for wide
area networks, especially
-
DS3-type WAN links.
-
Because this BNC connection
is connecting coax together,
-
you're usually working
with a type of media that's
-
a little more bulky and
a little more rigid,
-
and it can be more
difficult to work with.
-
But because you're using this
bayonet-type connection that
-
twists in and
locks in place, you
-
can be sure that nobody
can accidentally pull out
-
one of these connections
because you must untwist this
-
a quarter of the way before
you're able to pull it out
-
of that connection.
-
Another type of connector that
does not come disconnected
-
very easily is an F connection.
-
It's commonly used
on cable television
-
or cable-modem-type connections.
-
You can see that the
connection itself is threaded.
-
So to plug in this coax
connection, which is commonly
-
RG6 or RG59, you are threading
this onto the connection.
-
So this makes it very difficult
to accidentally disconnect an F
-
connection because
you first must
-
untwist all of those
threads before the cable can
-
be removed.
-
USB is some of the most common
connectors we use these days.
-
And for USB 1.1 and 2.0, we
use this style of connector.
-
The standard A plug has
the same form factor
-
as other USB standards,
although there
-
may be a different number
of pins inside of a USB 1.1
-
or USB 2.0 plug.
-
The standard B plug for
these versions of USB
-
is this squared-type plug.
-
And this is usually
one that you would
-
plug into a printer or
some other peripheral.
-
For smaller mobile
devices, you commonly
-
see the mini B plug
or the micro B plug
-
being used for
USB-type connections.
-
The USB 3.0 and
higher connections
-
have similar but slightly
different types of connectors.
-
The USB 3.0 standard
B plug, you can see,
-
still maintains
that square shape,
-
but there's additional
areas on the top
-
of that particular plug.
-
The standard A plug
looks and feels
-
exactly the same as the older
versions, but, as I mentioned,
-
this version has some
additional pins on the inside.
-
And you can see the micro B
plug has changed quite a bit.
-
We have some
additional pins that
-
have been added on if
you're using this newer
-
style of USB micro B.
-
A newer standard connector for
USB is the USB-C connector.
-
You can see these are relatively
small interfaces, as you
-
can see by the side
of this laptop,
-
and the USB interface
doesn't have a top or bottom.
-
You can plug it in
either way, and it
-
works exactly the
same regardless
-
of how you connect it.
-
If you're using a mobile
device from Apple,
-
you may be using a
Lightning connector.
-
This is a proprietary
Apple connector
-
that has eight different
pins that you would use
-
to connect your mobile device.
-
This has a number of
advantages over the Micro-USB
-
that you might find on
other mobile devices.
-
One advantage is that it
has a higher power output,
-
so you can charge those
mobile devices even faster.
-
Just like USB-C, the
Lightning connector also
-
does not have a top or bottom.
-
So you can simply
plug it in, and it's
-
going to work either way.
-
This is also a simpler
design than Micro-USB,
-
and it's designed to be more
durable than those connectors
-
as well.
-
In an earlier video, we looked
at all of the different SCSI
-
interfaces that
you might run into.
-
And in the older
legacy style of SCSI,
-
you can certainly
connect to those devices
-
using many, many different
types of interfaces.
-
Here's an example
of a 68-pin legacy
-
SCSI connection that's
on a motherboard.
-
And you can see the
difference between a SATA
-
drive and those connections, the
PATA drive and the very large
-
PATA data connection, and
then the SCSI connection
-
on the drive at the bottom.
-
Modern SCSI drives use a serial
attached SCSI drive connection
-
very similar to the
SATA-type connections
-
you would see on those drives,
although these interfaces
-
are slightly different than the
SATA drive that you might see.
-
And if you have internal
serial attached SCSI devices,
-
you may have an internal
high-density connector
-
such as this one that might be
used for those serial attached
-
SCSI drives.
-
If you're plugging in an
external device with SATA,
-
you're probably using
an eSATA connection.
-
An eSATA connector has ears on
the side and a single square
-
that's in the middle
of the connector.
-
This is a little different
than the internal SATA-type
-
connection that you would have
inside of a computer, where
-
the inside is more
of an L shape,
-
and there's a single ear
that's along the outside.
-
On the inside of our
desktop computers,
-
we may be connecting
older peripherals
-
or maybe connecting
our fans to something
-
like these four-pin
Molex connectors.
-
We call this a Molex connector
because it was created
-
by the Molex Connector Company.
-
Technically, this is also
an AMP MATE-N-LOK connector,
-
and it provides 12-volt
and 5-volt power
-
for these internal peripherals.
-
So if you're connecting
older storage
-
drives or the internal fans
or other components inside
-
of your system, you might be
using this Molex connector
-
to provide that power.
-
The power for Molex is
usually provided directly
-
from the power supply.
-
This power supply is
a bundle of cables
-
with other connectors on
the end for connection
-
to the motherboard, and you
can see the four-pin Molex
-
connectors are there as well.