Guided transmission media uses cabling to bind data signals, also known as bound media. Types include open wire, twisted pair, coaxial cable, and optical fiber. Unguided media transmits signals as electromagnetic waves via radio waves, microwaves, or infrared light. It can propagate through the ground, sky, or line-of-sight. The electromagnetic spectrum is divided into bands like VLF, LF, MF, HF, VHF, UHF, SHF, and EHF that determine the propagation method and applications.
WLAN is a wireless computer network that links two or more devices (using-spectrum or OFDM radio) within a limited area such as a home, school, computer laboratory, or office building.
WLAN is a marketed under the Wi-Fi brand name.
Wireless LANs have become popular in the home due to ease of installation and use.
A complete power point presentation to know how Public Switching Telephone Network works. Useful for those in the working field or for the ones who want to know more or submitting any project report..
Wireless communication , by Mulatu GebeyeawMulatu Gebeyaw
antennas, areas of research in mobile communication wireless, effects of mobility, frequency, gsm, mobile computing, modulation, transmission medium explain and categorize frequency, roaming, signal propagation, wireless applications, wireless communication principles, wireless limitations, wireless networking, wireless radio, warless devices, wlan media accessing technique accessing a shared medium
What is a network?
Need for networking
Components of Network
Types of Network
Evolution of Networking
Communication media
Data Communication Terminologies
Switching Techniques
Digital and Analog Transmission
Network Topology
Network Devices
Communication Protocols
Wireless/Mobile Computing
Transmission Media, Guided and unguided transmission mediaadnanqayum
Transmission Media and its types, Guided and unguided transmission media with examples (guided = (i) Twisted pair cable (ii) Coaxial cable (iii) Fiber optical cable, unguided = (i) Radio wave (ii) Microwave (iii) Infra-red wave)
WLAN is a wireless computer network that links two or more devices (using-spectrum or OFDM radio) within a limited area such as a home, school, computer laboratory, or office building.
WLAN is a marketed under the Wi-Fi brand name.
Wireless LANs have become popular in the home due to ease of installation and use.
A complete power point presentation to know how Public Switching Telephone Network works. Useful for those in the working field or for the ones who want to know more or submitting any project report..
Wireless communication , by Mulatu GebeyeawMulatu Gebeyaw
antennas, areas of research in mobile communication wireless, effects of mobility, frequency, gsm, mobile computing, modulation, transmission medium explain and categorize frequency, roaming, signal propagation, wireless applications, wireless communication principles, wireless limitations, wireless networking, wireless radio, warless devices, wlan media accessing technique accessing a shared medium
What is a network?
Need for networking
Components of Network
Types of Network
Evolution of Networking
Communication media
Data Communication Terminologies
Switching Techniques
Digital and Analog Transmission
Network Topology
Network Devices
Communication Protocols
Wireless/Mobile Computing
Transmission Media, Guided and unguided transmission mediaadnanqayum
Transmission Media and its types, Guided and unguided transmission media with examples (guided = (i) Twisted pair cable (ii) Coaxial cable (iii) Fiber optical cable, unguided = (i) Radio wave (ii) Microwave (iii) Infra-red wave)
Transmission media (data communication)Pritom Chaki
Transmission media is the material pathway that connects computers, different kinds of devices and people on a network. It can be compared to a superhighway carrying lots of information. Transmission media uses cables or electromagnetic signals to transmit data.
Nodeconf Barcelona 2015 presentation exploring several ways of building microservices in an asynchronous way. Presented the concept of a broker as an alternative to a multiple point-to-point architecture.
This paper analyzes the behaviour of a Voltage Source Converter Based HVDC system under DC pole to ground fault & AC faults for 2-level VSC-HVDC & 12-pulse VSC-HVDC system in order to better understand the system under such faults. DC line faults on HVDC systems utilising Voltage Source Converters (VSC) are a major issue for HVDC systems in which complete isolation of the faulted system is not a viable option. The occurrence of pole-to-ground faults on DC link is the most common fault in HVDC system. It was observed that with the occurrence of DC pole to ground faults leads to substantial over current in the AC grid system which may lead to damage of the converter valve. Simulation of 2-level VSC-HVDC under AC fault is carried out. The fault current magnitude is attempted with the mathematical analysis & which was found to be the same as the simulated result. This paper also compares the performance of the conventional 12-pulse (CSC) HVDC system with the PWM based 2-level VSC-HVDC & 12-pulse VSC-HVDC system.
Optical Fiber Basic Concept Which May Help You To Understand More Easily. The Slide Is Specially For Engineering Background. Anyone can get easily understand by studying this material. Thank you.
An optical fiber is a hair thin cylindrical fiber of glass or any transparent dielectric medium.
The fiber which are used for optical communication are wave guides made of transparent dielectrics.
Its function is to guide visible and infrared light over long distances.
Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fiber. The light forms anelectromagnetic carrier wave that is modulated to carry information.
Optical fiber is used by many telecommunications companies to transmit telephone signals, Internet communication, and cable television signals.
The process of communicating using fiber-optics involves the following basic steps: Creating the optical signal involving the use of a transmitter, relaying the signal along the fiber, ensuring that the signal does not become too distorted or weak, receiving the optical signal, and converting it into an electrical signal.
Optical cable: It serves as transmission medium.
Optical detector: It is responsible for optical to electrical conversion of data and hence responsible for demodulation of the optical carrier. It may be a photodiodes, phototransistor, and photoconductors.
Electrical receiver: It is used for electrical interfacing at the receiver end of the optical link and to perform the signal processing electrically.
Destination: It is the final point at which we receive the information in the form of electrical signal.
Applications -In telecommunication field
In space applications
Broadband applications
Computer applications industrial applications
Mining applications
In medical applications
In military applications etc.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Normal Labour/ Stages of Labour/ Mechanism of LabourWasim Ak
Normal labor is also termed spontaneous labor, defined as the natural physiological process through which the fetus, placenta, and membranes are expelled from the uterus through the birth canal at term (37 to 42 weeks
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Safalta Digital marketing institute in Noida, provide complete applications that encompass a huge range of virtual advertising and marketing additives, which includes search engine optimization, virtual communication advertising, pay-per-click on marketing, content material advertising, internet analytics, and greater. These university courses are designed for students who possess a comprehensive understanding of virtual marketing strategies and attributes.Safalta Digital Marketing Institute in Noida is a first choice for young individuals or students who are looking to start their careers in the field of digital advertising. The institute gives specialized courses designed and certification.
for beginners, providing thorough training in areas such as SEO, digital communication marketing, and PPC training in Noida. After finishing the program, students receive the certifications recognised by top different universitie, setting a strong foundation for a successful career in digital marketing.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
A Survey of Techniques for Maximizing LLM Performance.pptx
Transmission media
1. Transmission Media
Guided
Unguided
Guided Transmission Media
• Uses “Cabling” system
•The data signals are bound by the "cabling" system
• Also known as Bound Media.
Types of Guided Media
Open Wire
Twisted Pair
Coaxial Cable
Optical Fibre
2. Open Wire
There is a single wire strung between poles
No shielding or protection from noise interference is used.
This media is susceptible to a large degree of noise and
interference
Not acceptable for data transmission except for short
distances under 20 ft
3. Twisted Pair
The wires in Twisted Pair cabling are twisted together in pairs.
Each pair would consist of a wire used for the +ve data signal and a
wire used for the -ve data signal.
Any noise that appears on 1 wire of the pair would occur on the
other wire
Because the wires are opposite polarities, When the noise appears
on both wires, it cancels or nulls itself out at the receiving end.
4. The degree of reduction in noise interference is determined
specifically by the number of turns per foot.
Increasing the number of turns per foot reduces the noise
interference
To further improve noise rejection, a foil or wire braid shield is
woven around the twisted pairs
This "shield" can be woven around individual pairs or around a
multi-pair conductor (several pairs).
5. Twisted Pair
UTP
(Unshielded Twisted Pair)
STP
(Shielded Twisted Pair)
Twisting the wires together results in a characteristic impedance for the cable.
A typical impedance for UTP is 100 ohm for Ethernet 10BaseT cable.
UTP or Unshielded Twisted Pair cable is used on Ethernet 10BaseT and can also
be used with Token Ring.
It uses the RJ line of connectors (RJ45, RJ11, etc..)
STP or Shielded Twisted Pair is used with the traditional Token Ring cabling
6. Coaxial Cable
Coaxial Cable consists of 2 conductors
The inner conductor is held inside an insulator
The outer conductor woven around it providing a shield
An insulating protective coating called a jacket covers the outer
conductor.
The outer shield protects the inner conductor from outside electrical signals
7. The distance between the outer conductor (shield) and inner conductor plus
the type of material used for insulating the inner conductor determine the
cable properties or impedance.
Typical impedances for coaxial cables are 75 ohms for Cable TV, 50 ohms for
Ethernet Thinnet and Thicknet.
The excellent control of the impedance characteristics of the cable allow higher
data rates to be transferred than Twisted Pair cable.
8. Optical Fibre
Optical Fibre consists of thin glass fibres that can carry information
at frequencies in the visible light spectrum and beyond.
The typical optical fiber consists of a very narrow strand of glass
called the Core.
Around the Core is a concentric layer of glass called the Cladding. A
typical Core diameter is 62.5 microns (1 micron = 10-6 meters).
Typically Cladding has a diameter of 125 microns. Coating the
cladding is a protective coating consisting of plastic, it is called the
Jacket
9. Advantages of Optical Fiber
•Noise immunity: RFI and EMI immune (RFI - Radio Frequency Interference, EMI ElectroMagnetic Interference)
•Security: cannot tap into cable.
•Large Capacity due to BW (bandwidth)
•Longer distances than copper wire
•Smaller and lighter than copper wire
•Faster transmission rate
10. Refraction
An important characteristic of Fibre Optics is Refraction
Refraction is the characteristic of a material to either pass or reflect light.
When light passes through a medium, it "bends" as it passes from one medium to
the other.
11. If the angle of incidence is small, the light rays are reflected and do not pass
into the water
If the angle of incident is great, light passes through the media but is bent or
refracted.
Optical Fibres work on the principle that -
The core refracts the light
The cladding reflects the light.
12. The core refracts the light and guides the light along its path.
The cladding reflects any light back into the core and stops light from escaping
through it - it bounds the media
Optical Transmission Modes
There are 3 primary types of transmission modes using optical fibre.
a) Step Index
b) Grade Index
c) Single Mode
13. Step Index
Step Index has a large core. the light rays tend to bounce around, reflecting off the
cladding, inside the core.
This causes some rays to take a longer or shorted path through the core. Some take
the direct path with hardly any reflections while others bounce back and forth
taking a longer path.
The result is that the light rays arrive at the receiver at different times. The signal
becomes longer than the original signal.
14. Grade Index
Grade Index has a gradual change in the Core's Refractive Index.
This causes the light rays to be gradually bent back into the core path.
The result is a better receive signal than Step Index. LED light sources
are used. Typical Core: 62.5 microns.
Note: Both Step Index and Graded Index allow more than one light source
to be used (different colours simultaneously!). Multiple channels of data
can be run simultaneously!
15. Single Mode
Single Mode has separate distinct Refractive Indexes for the cladding and core.
The light ray passes through the core with relatively few reflections off the cladding.
Single Mode is used for a single source of light (one colour) operation.
It requires a laser and the core is very small: 9 microns
16. Disadvantages of Optical Fibre:
•Physical vibration will show up as signal noise!
•Limited physical arc of cable. Bend it too much & it will break!
•Difficult to splice
The cost of optical fiber is a trade-off between capacity and cost.-
- At higher transmission capacity, it is cheaper than copper.
- At lower transmission capacity, it is more expensive.
17. Transmission Media
Guided
Unguided
Guided Transmission Media
• Uses “Cabling” system
•The data signals are bound by the "cabling" system
• Also known as Bound Media.
Types of Guided Media
Open Wire
Twisted Pair
Coaxial Cable
Optical Fibre
18. Un-Guided Media
Wire less Media
Signals are transmitted in the form of Electro Magnetic waves
Waves ranges from 3KHz to 900 THz
Radio Waves & Micro waves
Infra Red
300 GHz
3 KHz
Light Waves
400 THz
900 THz
Classification of Un-Guided Media
On the basis of Band
On the basis of Propagation Method
Radio Waves
Ground
Micro waves
Sky
Infra Red
Line- of- Sight
19. Wireless Media
GROUND Propagation
SKY Propagation
(On the basis of Propagation Method)
Line- of- Sight propagation
Ionosphere
Earth
Earth
Earth
In ground PropagationThe Radio Waves transmitted
Through the lowest portion of
the atmosphere
Low Frequency Signals are used
The distance is depended on the
Power of the Signal
Higher Frequency Radio Waves
Very High Frequency Signals
Transmission through Ionosphere Transmitted in straight Lines
from antenna to antenna
Allow greater Distance
Antenna must be directional
and faced each other
Antenna should not be
affected by the curvature
of the earth
20. Electromagnetic medium is divided into Eight Ranges- called BANDS
Band
Range
Propagation
Application
VLF
(Very Low Frequency)
3-30 KHz
Ground
Long Range Radio
Navigation
LF
(Low Frequency)
30-300KHz
Ground
Radio Beacons and
Navigational Locators
MF
(Middle Frequency)
300KHz- 3 MHz
Sky
AM Radio
HF
(High Frequency)
3 MHz – 30 MHz
Sky
Citizen Band, Ship &
Air Craft
Communication
VHF
(Very High Frequency)
30 – 300 MHz
Sky & Line-of- Sight
VHF TV and FM Radio
UHF
300 MHz- 3 GHz
(Ultra High Frequency)
Line-of-Sight
UHF TV, Cellular
Phones
SHF
(Super High
Frequency)
3- 30 GHz
Line-of-Sight
Satellite
Communication
EHF
(Extremely High
30-300 GHz
Line-of-Sight
Radar/ Satellite