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- All right, let's quickly describe

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a couple more ethernet-based
devices and their technology.

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First is the patch panel, patch
panel is a physical device

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that you connect the cables
to for the computers.

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It's the longer runs of cables,

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you know, say from the server room

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out to the jacks in a particular company.

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And for example, you might
see a patch panel like this,

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and it has lots of RJ45
ports on the front.

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This is a 24 port patch panel.

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And I'll use something like this

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from TRENDnet, or Leviton,
or several other companies.

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You want to have something
nowadays that's Cat 6

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or higher so you can take advantage

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of gigabit speeds and even 10
gigabit speeds over copper.

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So that's just one example of that.

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You connect to the patch
panel by way of punch downs.

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You punch down all the
wires here on the back.

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So, you know, you have
the ports on the front

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and those connect to your switches

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to allow connectivity between
computers, but each wire...

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each cable I should say is
punched down on the back.

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And this is one of the
installs that I did.

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There's eight wires for each cable.

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So you can imagine there's a lot

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of punch downs that you're gonna do.

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And then, these cables go out
through the physical plant,

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through the ceiling,
and through the walls,

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and conduit 'til they get
to their final destination,

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which is gonna be either
a surface mount RJ45 jack,

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or it's gonna be something in the floor,

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or in the ceiling, or in the cubicle.

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It depends where the installation goes.

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And generally, when I do the install,

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I'll use blue for the RJ45 jacks,

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and I'll usually run telco as well,

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and I use white for that, those are RJ11.

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So that's an example of the patch panel.

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The patch panel and the jacks are part

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of the permanent physical plant.

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And that's not going anywhere.

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Then, to connect your computer,

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you use a patch cable
from here to the computer.

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If you're doing it wired, that is.

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And that is the temporary
connection, so to speak.

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So what we're talking about here

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is the permanent physical plant

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from the jack on the wall all the way

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to the server room at that patch panel.

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Another device is the repeater.

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A repeater can help you to
repeat the signal over copper.

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Copper signals can be sent 100 meters,

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or 328 feet when you're
using twisted pair cable,

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which is the most common, but
sometimes that's not enough.

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Sometimes you need to repeat the signal.

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If you have a powered
repeater, you can do that.

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You can increase the
signal by almost two times,

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but if you're using something passive,

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any type of passive device for repeating,

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or splitting you have
to be careful with that

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because that may cut the signal in half

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as far as the distance it can go.

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So you could use anything for a repeater.

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They have simple one port repeaters,

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or you could use a
regular four port switch,

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which is what a lot of people do.

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And finally power over
ethernet, awesome technology.

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It's the IEEE802.3af Standard.

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And what this means is
devices can not only get

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their data over the network cable,

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they'll get their power from that as well

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as long as the device is compliant.

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And so, you know, you can get devices

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in areas that have no power,
but they can still work.

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And one example of this
would be the power injector.

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This is pretty cool, let's say
you wanna install a camera,

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or a wireless access point in an area

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where there's no power
line, and there's no outlet.

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Maybe it's outside,
maybe it's on the ceiling

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somewhere in the middle of the building.

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Well, what you could do is
you would take this device

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and put this by your router,

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and just use a short patch cable

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to connect one of the ports
on the router to this,

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or one of the ports on the switch to this.

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And then, this device will take care

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of the power over ethernet.

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This plugs into the wall
and it generates power.

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And it sends that power
out through the other side,

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another RJ45 port, and it sends the power,

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and the data signal out to the device.

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And all you have to do, at this point,

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is run a twisted pair cable.

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You may wanna use shielded cable

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to shield it from interference but...

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or shield other cables
that might be near it

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from the interference that may
be generated by this cable.

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Be careful when it comes to
power over ethernet, or POE.

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You never know what kind of code

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there may be in your town or municipality.

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An electrician may be
required, it may not.

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So you always want to check
with your local ordinance

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before you do any work when it
comes to power over ethernet.

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But this way you can just
run a network cable out

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to wherever it is that
you want the device to be.

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If you want, you know,
let's say in your house

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you want a wireless access point,

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or a camera by your deck by the back door.

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Then, you can just run the network cable

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instead of having to run an electric line,

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which is a lot more trouble.

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And so, this is great
for the company as well.

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You might wanna have cameras outside

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in the perimeter of the building,

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or maybe inside or wireless access points.

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And, you know, these things the best place

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to put 'em is up on the ceiling.

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And there usually isn't
any outlets up there.

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So this is a great way to do that.

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You use the 802.3af Standard

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to send power over the ethernet line.

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So there's a couple things you wanna know:

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ethernet-based devices,
patch panels, the RJ45 jacks,

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repeaters, and power
over ethernet devices.

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Check some of those out online,

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check out some of the products
that are available to you.

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And that's about it for this sub lesson.