Transmission Media

1. Submitted By:
Md. Mejanur Rahman
Id: 183015125
Afna Peya
Id: 183015037
Department of CSE
Green University of Bangladesh
Submitted To:
Arpita Das
Lecturer,
Department of CSE.
Green University of Bangladesh

2. Guided Transmission media
 Transmission Media
 Guided Media
 Types of Guided Media
1. Twisted Pair cable
2. Coaxial Cables
3. Optical Fiber
 Unguided Media
Topic Included

3. What is Transmission Media
▶Sending of data from one device to another
through Medium is called Transmission Media
T
ransmission
Media
Guided Unguided

4. Guided (Wired)
▶ Guided transmission media means the data
signals are guided along the path like cabling
system .

5. Types Of Guided Media
▶ Guided (Wired)
▶ T
wisted Pair
▶ Coaxial cable
▶ Fiber Optics

6. Twisted Pair Wires
▶ Consists of two insulated copper wires arranged in a regular spiral pattern to
minimize the electromagnetic interference between adjacent pairs
▶ Often used at customer facilities and also over distances to carry voice as
well as data communications
▶ Low frequency transmission medium

7. Types of Twisted Pair
▶ STP (shielded twisted pair)
▶ the pair is wrapped with metallic foil or braid to insulate the pair from
electromagnetic interference
▶ UTP (unshielded twisted pair)
▶ each wire is insulated with plastic wrap, but the pair is encased in an outer
covering

8. Twisted Pair Advantages
▶ Inexpensive and readily available
▶ Flexible and light weight
▶ Easy to work with and install
Disadvantages
▶ Susceptibility to interference and noise
▶ Attenuation problem
▶ Relatively low bandwidth (3000Hz)

9. Coaxial Cable (or Coax)
▶ Used for cable television, LANs, telephony
▶ Has an inner conductor surrounded by a braided mesh
▶ Both conductors share a common center axial, hence the term “co-axial”

10. Coax Advantages
▶ Higher bandwidth
▶ 400 to 600Mhz
▶ up to 10,800 voice conversations
▶ Can be tapped easily (pros and cons)
▶ Much less susceptible to interference than twisted pair
Coax Disadvantages
▶ High attenuation rate makes it expensive over long
distance
▶ Bulky

11. FIBER OPTIC Cable
• Optical fiber consists of a glass core,
surrounded by a glass cladding with
slightly lower refractive index.
• In most networks fiber-optic cable is
used as the high-speed backbone, and
twisted wire and coaxial cable are used
to connect the backbone to individual
devices.

12. Fiber Optic Layers
▶ consists of three concentric sections

13. Fiber Optic Advantages
▶ greater capacity (bandwidth of up to 100 Gbps)
▶ smaller size and lighter weight
▶ lower attenuation
▶ immunity to environmental interference
▶ highly secure due to tap difficulty and lack of signal radiation

14. Fiber Optic Disadvantages
▶ Expensive to install
▶ requires highly skilled installers
▶ adding additional nodes is difficult

15. Unguided Media
Wireless transmission waves

16. Radio Waves
Omnidirectional Antenna
Frequencies between 3 KHz and
1 GHz.
Are used for multicasts
communications, such as radio and
television, and paging system.

17. Radio Waves
17
Applications Of Radio waves:
A Radio wave is useful for multicasting when there is one sender
and many receivers.
An FM radio, television, cordless phones are examples of a radio
wave.
Advantages Of Radio transmission:
Radio transmission is mainly used for wide area networks and
mobile cellular phones.
Radio waves cover a large area, and they can penetrate the
walls.
Radio transmission provides a higher transmission rate.

18. Microwaves
17
 frequency between 1 and 300 GHz
Micro waves are unidirectional.
Very high frequency Micro waves can not penetrate walls.
They are used in Cellular phones, satellite networks, wireless
LANs.

19. Microwaves
17
Advantages Of Microwave:
Microwave transmission is cheaper than using cables.
It is free from land acquisition as it does not require any land for
the installation of cables.
Microwave transmission provides an easy communication in
terrains as the installation of cable in terrain is quite a difficult
task.
Communication over oceans can be achieved by using
microwave transmission.

20. Infrared
 Frequencies between 300 GHz to 400 THz.
 Can not penetrate walls.
Used for short-range communication
 Typical uses
 TV remote control
 IRD port
Are blocked by walls
 No licenses required

21. Satellite Microwaves
17
Satellite Microwave Communication
A satellite is a physical object that revolves around the earth at a
known height.
Satellite communication is more reliable nowadays as it offers
more flexibility than cable and fiber optic systems.
We can communicate with any point on the globe by using
satellite communication.

22. THANK YOU