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If you're connecting a
telephone or an analog modem

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to your Plain Old Telephone
System, or your POTS system,

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then you're probably
using this RJ11 connector.

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This is what we technically call
a six-position two-conductor

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connector.

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That means there are six
places for wires inside

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of this connector, but
we're really only using

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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

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that you're using for your
modem or your telephone actually

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have four wires inside of them
with four different conductors.

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That six-position four
conductor is technically

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an RJ14 connector, but it has
exactly the same connector

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on the end.

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And we often use these
cables interchangeably.

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With a separate
set of conductors

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or separate set of wires
inside of this cable,

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we're able to use this
single cable for dual line

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use for someone who might have
two telephones on their desk.

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Here's the connection
that is inside

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the modem or inside of the
device that's connecting

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to this RJ11 connection.

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And you can see
the two conductors

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that are inside
of that connector

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when you plug in the
RJ11 modular connector.

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A connector that's a little bit
wider than an RJ11 is an RJ45.

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This is the type of
connector you commonly

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see associated with a
wired Ethernet connection.

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This is an eight-position
eight-conductor connection,

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which means we have all eight of
those connectors and all eight

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of those wires that are being
used inside of that cable.

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This is also similar
to a format you

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might see called an RJ48C,
which has an eight-position four

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conductor.

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Those are commonly seen
with T1 or wide area network

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connections.

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An RS-232 connection stands
for Recommended Standard 232.

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This is a serial connection
type that has literally

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been around since 1969.

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And it has been around
so long because it's

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able to connect to so many
different kinds of devices.

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Before there was
USB-type connectivity,

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we commonly used RS-232
to connect our mouse

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connections, our printers, our
networks, and other devices

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as well.

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These days, RS-232
is commonly used

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as a configuration
port on a switch

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or a router or a
firewall, and it's

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plugging into a serial
interface on a laptop

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or another computer.

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The 25-pin version of RS-232 is
usually referred to as a DB25.

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This nine-pin connection,
which is a bit more modern,

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you'll sometimes hear
referred to as a DB9.

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But, technically,
it's the smaller style

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of D-subminiature interface,
which is the E side.

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So you may see this
nine-pin connection being

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referred to as DB9 or DE9.

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It's really referring to
exactly the same connection.

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A very common type of
coaxial cable connection

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is a BNC connection.

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The B in BNC stands
for Bayonet, which

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is the style of cable that plugs
in and then twists to lock.

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And you can see the locking
mechanism on the cable

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right here.

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The N and the C in BNC
stands for Paul Neill,

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who is at Bell Labs, and Carl
Concelman, who is at Amphenol.

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They designed this
particular connection

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and called it the
BNC connection.

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As I mentioned, this
is commonly seen

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on coax connections for wide
area networks, especially

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DS3-type WAN links.

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Because this BNC connection
is connecting coax together,

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you're usually working
with a type of media that's

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a little more bulky and
a little more rigid,

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and it can be more
difficult to work with.

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But because you're using this
bayonet-type connection that

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twists in and
locks in place, you

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can be sure that nobody
can accidentally pull out

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one of these connections
because you must untwist this

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a quarter of the way before
you're able to pull it out

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of that connection.

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Another type of connector that
does not come disconnected

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very easily is an F connection.

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It's commonly used
on cable television

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or cable-modem-type connections.

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You can see that the
connection itself is threaded.

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So to plug in this coax
connection, which is commonly

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RG6 or RG59, you are threading
this onto the connection.

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So this makes it very difficult
to accidentally disconnect an F

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connection because
you first must

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untwist all of those
threads before the cable can

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be removed.

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USB is some of the most common
connectors we use these days.

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And for USB 1.1 and 2.0, we
use this style of connector.

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The standard A plug has
the same form factor

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as other USB standards,
although there

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may be a different number
of pins inside of a USB 1.1

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or USB 2.0 plug.

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The standard B plug for
these versions of USB

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is this squared-type plug.

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And this is usually
one that you would

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plug into a printer or
some other peripheral.

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For smaller mobile
devices, you commonly

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see the mini B plug
or the micro B plug

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being used for
USB-type connections.

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The USB 3.0 and
higher connections

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have similar but slightly
different types of connectors.

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The USB 3.0 standard
B plug, you can see,

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still maintains
that square shape,

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but there's additional
areas on the top

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of that particular plug.

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The standard A plug
looks and feels

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exactly the same as the older
versions, but, as I mentioned,

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this version has some
additional pins on the inside.

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And you can see the micro B
plug has changed quite a bit.

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We have some
additional pins that

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have been added on if
you're using this newer

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style of USB micro B.

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A newer standard connector for
USB is the USB-C connector.

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You can see these are relatively
small interfaces, as you

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can see by the side
of this laptop,

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and the USB interface
doesn't have a top or bottom.

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You can plug it in
either way, and it

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works exactly the
same regardless

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of how you connect it.

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If you're using a mobile
device from Apple,

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you may be using a
Lightning connector.

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This is a proprietary
Apple connector

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that has eight different
pins that you would use

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to connect your mobile device.

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This has a number of
advantages over the Micro-USB

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that you might find on
other mobile devices.

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One advantage is that it
has a higher power output,

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so you can charge those
mobile devices even faster.

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Just like USB-C, the
Lightning connector also

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does not have a top or bottom.

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So you can simply
plug it in, and it's

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going to work either way.

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This is also a simpler
design than Micro-USB,

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and it's designed to be more
durable than those connectors

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as well.

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In an earlier video, we looked
at all of the different SCSI

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interfaces that
you might run into.

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And in the older
legacy style of SCSI,

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you can certainly
connect to those devices

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using many, many different
types of interfaces.

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Here's an example
of a 68-pin legacy

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SCSI connection that's
on a motherboard.

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And you can see the
difference between a SATA

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drive and those connections, the
PATA drive and the very large

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PATA data connection, and
then the SCSI connection

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on the drive at the bottom.

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Modern SCSI drives use a serial
attached SCSI drive connection

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very similar to the
SATA-type connections

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you would see on those drives,
although these interfaces

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are slightly different than the
SATA drive that you might see.

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And if you have internal
serial attached SCSI devices,

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you may have an internal
high-density connector

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such as this one that might be
used for those serial attached

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SCSI drives.

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If you're plugging in an
external device with SATA,

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you're probably using
an eSATA connection.

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An eSATA connector has ears on
the side and a single square

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that's in the middle
of the connector.

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This is a little different
than the internal SATA-type

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connection that you would have
inside of a computer, where

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the inside is more
of an L shape,

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and there's a single ear
that's along the outside.

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On the inside of our
desktop computers,

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we may be connecting
older peripherals

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or maybe connecting
our fans to something

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like these four-pin
Molex connectors.

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We call this a Molex connector
because it was created

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by the Molex Connector Company.

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Technically, this is also
an AMP MATE-N-LOK connector,

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and it provides 12-volt
and 5-volt power

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for these internal peripherals.

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So if you're connecting
older storage

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drives or the internal fans
or other components inside

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of your system, you might be
using this Molex connector

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to provide that power.

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The power for Molex is
usually provided directly

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from the power supply.

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This power supply is
a bundle of cables

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with other connectors on
the end for connection

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to the motherboard, and you
can see the four-pin Molex

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connectors are there as well.