Time
3 hours 38 minutes
Difficulty
Beginner
CEU/CPE
2

Video Description

Computer Networks Media Types- Wired media (cables)

  • Copper cables

    • Coaxial cables
    • Twisted pair cables

      - Shielded (STP)/Unshielded (UTP)
      
  • Fiber optic cables

    • Single mode/Multi-mode
  • Wireless media (Air)

Coaxial Cables- High capacity cables

  • Used for video transfer
  • Two types

    • Thick coaxial cable (thicknet)

      • ½ inch diameter
      • 10base5
    • Thin coaxial cable (Thinnet)

      • ¼ inch diameter
      • 10base2
  • Use BNC connector

Shielded Twisted Pair (STP) Cables- Protected

  • Hard to install
  • RJ45
  • Crimper Tool

Unshielded Twisted Pair (UTP) Cables- Most commonly used type

  • Easy to install
  • Less expensive
  • Electromagnetic interference
  • RJ45 connector
  • Crimper tool

Fiber Optic Cables- Faster than twisted pair and coaxial

  • Send data as light pulses over glass medium
  • Free of electromagnetic interference
  • Expensive
  • Hard to install
  • Used in submarine connections
  • More secure
  • Core carries the signals
  • Core made of plastic or glass
  • Cladding maintains the signal in the center of the core as the cable bends
  • Sheathing protects the cladding and the core
  • Advantages

    • Total immune to the EMI
    • Highly resistance to Eavesdropping
    • Support extremely high data transfer rate
    • Allow grater cable distances without repeater
  • Disadvantages

    • Very expensive
    • Difficult to work with

Fiber Optic Cables Modes- Single Mode

  • Transfer data through the core using a single light ray
  • The core diameter is around 9 microns
  • Supports a large amount of data
  • Cable length can extended a great distance
  • Multi-mode

    • Transfers the data through the core using multiple light rays
    • The core diameter is around 50 microns
    • Cable length are limited in distance compared to single mode

Wireless Media (Air)- WiFi Wireless Fidelity

  • Uses frequencies 2.4GHz or 5Ghz
  • Standards: a,b,g, and n
  • Access Point (AP) connecting devices
  • Mobility
  • Flexibility
  • Less secure

Video Transcription

00:00
Now it's time to know more about the transmission media
00:05
that are used in computer networks.
00:09
The media can be wired media using cables or wireless media using
00:16
the network. A single network, as you can see in this image, can be composed of a wire port and a wireless part,
00:25
most of them in the same network and connected to each other.
00:30
The water in media
00:32
uses cables either made of copper or made off fiber optic
00:37
copper cables can be quite axle or twisted pair cables
00:43
that twisted pair cables themselves can be shielded or unshielded
00:48
shell that twister pair STP or unshielded twister pair you TP cables.
00:54
The fiber optic cables can use the light signals in single mood, such as the laser mode or in multi mode.
01:03
The wireless media wants more, uses the air interface to transmit and receive signals.
01:10
The quacks L cables, as you can see in the images composed off
01:15
several ports that is ended with an outer jacket.
01:19
It's high capacity cables used for video transfer.
01:23
There are two types off you Exhale cables Fick who excel cables or thick nut and think oh, Axl cables or thin that
01:33
the thick ones are half inch damage.
01:36
And there who'd is stunned? Based five. Which means, for example,
01:41
the speed is 10 megabits per second, and the maximum distance that can be covered is 500 meters.
01:49
The think wechsel cable code is
01:52
10 base to, which means the speed is
01:55
10 megabits per second and the maximum distance covered these 200 meters.
02:00
The diameter of the Thinker Excel cable is quarter inch, while the diameter of the fickle Excel cable is half inch
02:08
wolf cables. Use the B and C connectors.
02:13
The shield. The twisted pair STP cables are protected through this field
02:20
against the electromagnetic interference with other electrical signals.
02:25
The STP cables are hard to install due to exist existence. Off this shielding
02:32
STP cables use the registration jack or J 45
02:38
which is
02:38
in the middle of this image.
02:42
The Crim fertile, used on the bottom left is used to connect such cables to the registration jack
02:50
by pressing on the cable.
02:52
Two.
02:53
Enter inside this restaurant registration drag and be connected to the network's. Afterwards.
03:02
The U T P cables or the unshielded twisted pair cables are the most commonly used types.
03:09
They are easy to install
03:12
less expensive.
03:14
Do you know the absence of shielding?
03:16
But they are susceptible to electromagnetic interference with other electrical signals. Also, due to the absence of shielding,
03:25
U T P uses the registration Jack 45 connected to Audrey, 45 uses the same crimp er tool tow. Connect the registration right through the cables
03:38
that twisting
03:39
off the U T P cable determines its capacity. For example, in this image,
03:45
cable A has less twisting than cable B.
03:50
This makes cable a off less capacity than cable. B
03:54
Cable is Cat three you TP cable while cable be escaped. Five You TP cable
04:01
and both are made of the same. Material
04:04
only differs
04:06
in the number off twists per meter.
04:11
Cable, eh?
04:13
Can hold up to 10 megabits per second. Meanwhile, cable we can hold up 200 megabits per second due to the extra numbering
04:24
number off twisting. For this type off cable,
04:30
the categories off
04:31
U T P cables are in the stable
04:33
cat one or category one is four. Voice only. Telephone wires
04:40
get five
04:41
speed reaches up 200 megabits per second, which is the first Internet
04:46
get five e reaches upto one gigabit per second.
04:49
Category six ranges from one gigabit 10 gigabit per second, which is the gigabit Ethernet.
04:59
The pin's the terminals off. The you tippy cables are in the colors shown
05:06
in the image at the right
05:09
brown white, brown, orange, wide, blue, blue, white, orange, green, white, green.
05:15
They range from 1 to 8 from bottom to top.
05:20
Terminal number one and terminal number two, as shown on the image
05:26
on the left, are used for transmission.
05:28
Terminal number three and terminal number six are used for receiving.
05:33
This is the standard off the U T P cape.
05:38
The fiber optic cables transmit light,
05:42
not electricity.
05:44
It's faster than the twisted pair and the co axial and faster than the copper cables. In general,
05:50
it sends data as light policies over glass. Medium.
05:56
It is free off electromagnetic interference. Since the pulses are light, not electricity, it's expensive, and it is hard to install
06:05
this start off cables can be used in the submarine connections connecting
06:11
continents to each other and countries to each other over the Internet.
06:15
Fiber off the cables are more secure. They are less susceptible to sniffing
06:20
over such type off cables.
06:25
The fiber optic cables are composed off core carriers for the signals. This score is made off. Plastic or glass
06:32
cladding surrounding the core maintains the signal in the center of the corps.
06:39
Even if the cable bends
06:41
sheeting that is surrounding the cladding
06:44
protects the cladding and the core both
06:49
through the outer jacket.
06:53
Also,
06:55
the fiber optic cables molds are the single mode or multi mode
07:00
single mode transfer data through the core using a single light ray.
07:04
The core diameter is around nine. Micro's supports a large amount of data larger than the multi mode cable.
07:14
The cable love can extend a greater distance than the multi moved.
07:17
The multi mode cable transfers the data through the core, using multiple light rays. The core diameter is about 15 microns. The cable length
07:27
is limited in distance compared to single mode,
07:30
which means that the single most cable is a more recent technology and a more expensive technology than the multi move.
07:41
The advantage is off. The fiber optic cable is it is totally immune to the E. M I electromagnetic interference, highly resistance to sniffing or eavesdropping
07:51
support extremely high data transfer rate. This makes it suitable for submarine cables.
07:59
It allows greater cable distance without the need toe repeaters.
08:05
The disadvantage is it is very expensive.
08:09
It is very difficult to work with and needs very talented to conditions to deal with.
08:16
Let's talk about the wireless media using the air interface
08:20
the WiFi, which is the abbreviation off the wireless fidelity.
08:24
It uses the frequencies off 2.4 gigahertz or five gigahertz.
08:30
The standards off the WiFi are
08:33
a B, G or N.
08:37
The wife I use is the excess point previously demonstrated in this course tow. Connect the devices wirelessly and to connect the wireless part of the network. Tow the wild port.
08:48
When you go wireless, you gain more mobility. You gain more flexibility for the devices connected wirelessly,
08:56
but you lose security.
08:58
Wireless networks are less secure than the wired networks. They are susceptible to sniffing, since the media used is merely the air, which is exposed to all the users off the network.
09:13
By this, we have demonstrated the computer networks, transmission media.
09:18
Thank you

Up Next

Network Fundamentals

In this basic Network Fundamentals course, you will get an introduction to basic networking concepts to expand your knowledge about network security. You will get a complete overview of networks including wired and wireless computer networks, devices, and protocols.

Instructed By

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Mohammad Adly
EC3 Manager at Information Technology Institute
Instructor