Introduction to Wired Communications and Coaxial Cable
8 hours 19 minutes
Our next section is on wired connections
here. We'll take a look at different types of media.
I love the picture on the right because I swear to you, I've walked into rooms and seen Marion Racks just like this, so it kind of gives me a memory back to the olden days
for some media types. We'll talk about serial connections with Rs 2 32. That's an eye Tripoli standard.
We've also got twisted pair cabling and with twisted pair cabling. We have two flavors shielded and unshielded.
We've got coaxial cable and then, of course, fiber optic cable where we have multi mode and single mode.
These aren't used that frequently today.
These were used for cable models back in the day, and these connector types are either referred to as DB nine's or D nine's. They've been replaced by U. S. B. And don't be surprised if something data shows up on the exam. It's always good to know where we've come from. That way we can know where we are.
USB connections really have replaced this, but these were used for serial connections. Again. We saw them used a lot with bottoms.
There are various cable types that we use today. We have co axial, which is here on the left and underneath. You've got connector types.
You definitely want to be able to match the cable type to the connector.
You can see the way coaxial cable is done, and you can see why it's called co axial. We have two axes running with each other,
and, of course, this is copper based cabling. So it has some of the problems that cover based cabling has. Like it's easy to eavesdrop. It's accessible to electromagnetic interference.
Although co axis is better than you tp twisted pair cabling, it still has some susceptibility to interference.
Back in the day, when we use coaxial cable, we use it in an old bus networks where we had a central trunk of cable, which is what we refer to as thick nut.
Thick neck cable had an attenuation length of 500 m so you could go a long distance with thick coaxial cable before you suffered an attenuation.
Attenuation is the idea that the longer the cable, the weaker the signal until you really get to a point where signal isn't quality any longer.
We use a thick nut as our chunk because of the fact that it did carry data so long.
then we sometimes use thin net as connections directly to the host.
Then that had a distance of 185 m. So a little shorter but fairly decent. We connect into the host with BNC connectors. We had F connectors, barrel connectors and T connectors, all different connector types. This is what we're seeing with cable, cable TV and connectivity to the Internet through cable.
So you've probably seen co ax before.
Another type I'm sure you've seen it before is twisted pair cabling.
This is by far the most calm going back.
This is by far the most common type of cabling in practice today, and you can see why it has the name Twisted pair.
You have eight individual wires, and they are twisted together in pairs. The idea about the twists is when you have copper cabling running side by side, you can have an issue called signal Bounce
Signal bounces where it jumps from one signal to the next, or from one wire to the next back and forth. The twists actually prevent that
We also look at the idea that there are certain configurations for how these twists should be set up. Depending on the type of cable
we connect these wires into connectors called RJ 40 fives,
the RJ 45 is going to look a lot like the RJ 11 that we use for phone systems.
The big difference is four wires are used for the phone system, and we use all eight for RJ 45.
Also, twisted pair cabling is very susceptible to interference and crosstalk, and that's actually what it's called.
When a signal jumps from one wire to another, it's called cross talk.
The twist can help alleviate that.
What you'll find is twisted pair cabling won't give you the length that other type of cables will. They'll allow you about 100 m before the attenuation sets it.
The biggest reason that we use twisted pair cabling today is because it's cheap and easy to work with. It's significantly cheaper than any other types of cables.
It's very flexible, and it's not a rigid cable type. We want to keep that in mind that many times cheap makes the decision for us.
Twisted pair cabling is very susceptible to radio frequency interference. Electromagnetic interference again only has a short distance of 100 m before attenuation, but the money always wins.
And our final illustration. We see fiber optic cable
fiber optic cable is made of glass and the signals sent through pulses of light
the big benefit. In addition to speed, it's very difficult to eavesdrop on fiber optic cable.
Also, you don't have problems like am I and R F I.
You get great speed. You get great distance with fiber optic cable, but the downside is it's expensive
on the exam, you will need to be able to name your connector types. I would pay particular attention here.
If we look at the S T connector, you've got a kind of bayonet type of conductor or you can see the element sticking out to make the connection.
As C is a push, pull LCS give you the kind of clip on top. And Mt. RJ is also have that snapping connector in a much smaller form factor.
When we say foreign factor, we usually mean physical design.
Those are some of the common connector types or fiber optic. Make sure you know RJ 45 for twisted pair and make sure you know BNC connectors for Caracciolo.
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