Copper Connectors- CompTIA Network+ N10-006 – 1.5

Copper Connectors- CompTIA Network+ N10-006 – 1.5


In networking we connect a lot
of different devices together. And because of that, we have
a lot of different connector types so that all of
these different devices can communicate with each other. In this video, we’ll look at
some of the most popular copper connectors that we
use in networking. If you’ve ever
connected a telephone or plugged in a
modem connection, you’ve probably connected
in RJ11 connector. It is the small
connector that you’ll see with the tab on the top
that locks it into place when you plug it into the port. And it has these connectors
on the outside of the cable if you look. Generally we refer to
this as a 6P2C connector. That means it has six
positions and two conductors, but generally you’ll
find these cables are wired with technically
an RJ14, which means there are six positions
and four conductors. It’s ready to be used
for dual line use, and if you look
closely, you can even see the black, the red, the
green, and the yellow wire inside of that RJ11
being connected to the end of that
RJ11 connector. For most of our
ethernet connections we’re using an RJ45 connector. This is a little bit
wider than the RJ11, and this is an eight position
eight conductor cable connector. You’ll see all eight of those
on the end of the connector if you look at it. All eight copper connections
are there and being used for these ethernet connections. This is also a
very similar shape for something called an RJ48C. That C connector is one that is
used for T1 or WAN type lines. The cabling inside of these
may be different on both ends, so it’s very common
to look at them to see exactly how they’re wired. But you’ll become very
accustomed to seeing this RJ45 connector
on the outside of your ethernet connections. A standard that’s been around
since the 1960s is the RS232. That’s technically a
Recommended Standard 232, but you’ll never hear
it referred to that way. We always refer
to it as an RS232. This is commonly used for
serial type connections. We’re connecting a
modem to our computer. We’re connecting to a switch
or a firewall or router so that we can configure it
through a serial connection. We used to use these
four mice and printers, but now we’ve
upgraded all of those to the USB type connectors. You’ll notice that there are
different sizes of an RS232. There’s these different
sizes you see in this table, a D, A, B, C, D,
and E. Generally we refer to everything
is db because the DB25 was so prevalent when
the standard came out that when this nine-pin
connector came out we started calling it a DB9. But as you can see the
technical term is a DE9. You’ll rarely see
it called a DE9. You’ll always hear somebody
refer to it as a DB9 connector. And you can see
those connectors are on the back of your motherboard
or perhaps the cables that you have and
that’s where you’ll be plugging in a
serial connection to connect to a modem,
to configure a router, or to perform some other type
of administrative function. Occasionally you’ll
be running a cable and you’ll find that it’s
just a little bit too short. It would be nice to be able
to combine cables together so you can extend
the length of them, and you can do exactly
that with a coupler. This lets you do exactly
this for an ethernet, maybe an F-connector or for coax. Maybe you’ve got
a BNC connection that you need to extend. These couplers are
perfect for doing that. This is usually
something you would do in very specific
cases, however. Every time you’re
putting a coupler in line you’re losing signal
across that link. And if you’re going
a very long distance, you may find that the
signal loss is too much. You can’t make it
from end to end with a coupler in the middle. That’s why we often decide to do
end and complete runs from one end to the other without any
disconnections in between. That way we can
be a assured we’re getting the best possible signal
all the way through the line. But if you need something
for temporary use, maybe there’s a specific case
where you don’t have a choice, you need to extend
this cable, a coupler may be the perfect thing to use. A BNC connector is
a connector that was designed by Paul Neill
at Bell Labs and Carl Concelman at Amphenol. This is a connector that
is a bayonet connector. That means when you
connect it you can turn it and it’s locked in place. It’s not going to go anywhere. It won’t accidentally pull
out of that connector. If you look closely, there’s
this tiny little latch at the end of the connector. So you turn it and it snaps
nicely into the connection. You’ll see these in
things like 10BASE2, when you’re using RG-58
thin net, like this one right here where you’re plugging
in with a BNC connection on both sides. These days you commonly see
the BNC used on WAN links, like T3 connections
that are commonly provided to you over coax
and then commonly have that BNC connector at the end. These BNC c connectors are
commonly used with coax, and if you’ve got
a lot of coax cable it’s going to be taking
up a lot of room. And some of these
BNC panels put things very close to each other. It can be difficult to
get your fingers in there to connect or disconnect one
single BNC connector inside of that. You’ll sometimes
find special tools that are used to
extend your reach and wrap around the BNC
cables just because of that. But overall it’s
a connector that stays in place once
you put it there, and if you need to be sure that
it’s not going to accidentally pull out of that connector,
you may want to use something like a BNC connection. We commonly see F-connectors
on the end of RG-6 cable, when it’s used for television
connections for instance, and since that’s used
by our cable company, we commonly see it for
cable modems as well. It’s a threaded connector–
you can see the threads if you look closely– and
when you’re putting this on to the connection you
would screw it in and even sometimes tighten
it down, and that makes it very difficult for
this to accidentally disconnect from our F-connection. If you’re ever in a data center
and you look at the back wall you may see an entire
wall filled with wires, and this may be
something left over from the old analog
days of audio where we plugged in
all of our phones and punched them down
to the 66 blocks. Some very old digital
links might also be connected to some
of these 66 blocks. You can see that the left
side is patched to the right, so generally you
have the connectors on the left behind this
block are connected to these on the right. So you can punch down
a lot of connections and then extend that
over to the other side of the punch-down block. You generally need both the
wire and a punch-down tool, so it’s going to take
some extra effort. You can see that
this is not something very modular to work with. You really have to
have the right tools to be able to get those
wires into those very small connections
so that they can make that link through the
insulation to the copper underneath. We generally see people
migrating to 110 blocks these days, so if you go
into an environment that has a little bit
older equipment you may see both 66
blocks and 110 blocks on the wall at the same time. A 110 block works in a
similar way to the 66 block. We’re punching down
wires into this device and then connecting
those wires to others. This is our block that
allows these cables to meet in the middle. This has effectively
replace the 66 blocks, so if you’re running a Category
5 or Category 6 network connection, you’re probably
running it through a 110 block. This works by
first punching down all the wires on the
bottom– you can see them in this picture– and then
you put a connecting block on the top and now you
have additional wires you could punch down at the top
to complete that connection. Let’s get a picture where
we can really look at this. You can see those cables
in the back a little bit that are wired down,
and then there’s an additional block on the top. And then even it looks here
like someone has punch down a circuit that extends
across multiple wires all at the same
time, something you’d commonly see on a voice-type
network, for instance. These are great
blocks to work with. They certainly work for
your ethernet connections. You just have to make
sure that you’re well organized with where
the wires are going and that you have
the right tools to use for punching these down.

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