This document provides an overview of telecommunications components and transmission media. It describes the basic components required for communication between sending and receiving devices, including physical transmission media like twisted-pair cable, coaxial cable, and fiber-optic cable. It also covers wireless transmission media and different types of communication lines over the telephone network, such as dial-up, DSL, ISDN, and dedicated lines. Common communication devices like modems, network cards, routers and hubs/switches are also described.
Internet Telephony has evolved to become a key platform for realizing the long promised benefits of voice/data convergence and the merging of the PSTN (Public Switched Telephone Network) with the Internet.
Wireless communication is the transfer of information between two or more points that are not connected by an electrical conductor.
The most common wireless technologies use radio
This Presentation consists of various Network Devices
Hub, Router, Repeater, Bridge, Brouter, Gateway, NIC etc. It is very helpful for B.tech, BCA, MCA, M.Tech students and for those who is interested in networking.
Internet Telephony has evolved to become a key platform for realizing the long promised benefits of voice/data convergence and the merging of the PSTN (Public Switched Telephone Network) with the Internet.
Wireless communication is the transfer of information between two or more points that are not connected by an electrical conductor.
The most common wireless technologies use radio
This Presentation consists of various Network Devices
Hub, Router, Repeater, Bridge, Brouter, Gateway, NIC etc. It is very helpful for B.tech, BCA, MCA, M.Tech students and for those who is interested in networking.
#network devices #computer network
hi guys,
here is a presentation about network devices.
for more computer network ppt , refer my profile.
you can also visit my YouTube channel TECHISEASY for videos on this topic.
switching techniques in data communication and networkingHarshita Yadav
it is a detailed presentation on switching techniques. it includes the three types of switching technique. it is described in such manner that you can learn switching without any difficulties.
The IP addresses used to identify systems on a TCP/IP network. The IP address is an absolute identifier of both the individual machine and the network on which it resides.
Every IP datagram packet transmitted over a TCP/IP network contains the IP addresses of the source system that generated it and the destination system for which it’s intended in its IP header.
Global system for mobile communication(GSM)Jay Nagar
~Introduction
~GSM Architecture
~GSM Entities
~SMS Service In GSM
~Call Routing In GSM
~PLMN Interfaces
~GSM Addresses and Identifiers
~Network aspects in GSM
~Handover
~Mobility Management
~GSM Frequency Allocation
~Authentication and Security In GSM
#network devices #computer network
hi guys,
here is a presentation about network devices.
for more computer network ppt , refer my profile.
you can also visit my YouTube channel TECHISEASY for videos on this topic.
switching techniques in data communication and networkingHarshita Yadav
it is a detailed presentation on switching techniques. it includes the three types of switching technique. it is described in such manner that you can learn switching without any difficulties.
The IP addresses used to identify systems on a TCP/IP network. The IP address is an absolute identifier of both the individual machine and the network on which it resides.
Every IP datagram packet transmitted over a TCP/IP network contains the IP addresses of the source system that generated it and the destination system for which it’s intended in its IP header.
Global system for mobile communication(GSM)Jay Nagar
~Introduction
~GSM Architecture
~GSM Entities
~SMS Service In GSM
~Call Routing In GSM
~PLMN Interfaces
~GSM Addresses and Identifiers
~Network aspects in GSM
~Handover
~Mobility Management
~GSM Frequency Allocation
~Authentication and Security In GSM
Data Communication Networks Lecture Slides based largely on the book Electronic Communication Systems by Wayne Tomasi and covering topics on Data Communication Codes, Error coding, Bit and Character Synchronization, Data Communication Hardware, UART, and USRT.
Used to digitize images or video from the outside world into the computer.
Digital camera
Webcam
Media players
Hardware peripheral that allows computer users to input audio into their computers
MIDI information is sent to a computer that is capable of reproducing an array of digital sounds that resemble traditional analog musical instruments.
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.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
The Art Pastor's Guide to Sabbath | Steve ThomasonSteve Thomason
What is the purpose of the Sabbath Law in the Torah. It is interesting to compare how the context of the law shifts from Exodus to Deuteronomy. Who gets to rest, and why?
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
2. Objectives
Discuss the purpose of the
components required for
successful communications
and identify various sending
and receiving devices
Describe various types of
lines for communications
over the telephone network
Describe commonly used
communications devices
Describe various physical
and wireless transmission
media
3. Introduction to Communications System
Server
Desktop
computer
Mainframe
GPS receiver
Smart phone
Handheld game
consoles
Notebook
Internet-enabled
portable media players
4. Introduction to Communications System
• Computer communications describes a process
in which two or more computers or devices
transfer data, instructions, and information.
• For successful communication, you need the
following:
Sending device
Communications
channel
Receiving device
5. Introduction to Communications System
• A sending device initiates an instruction to
transmit data, instructions, or information.
• A communication channel is the medium on
which the data, instructions, or information
travel.
• A communication device connects the sending
or receiving device to a communication channel.
• A receiving device accepts the transmission of
data, instructions, or information.
6. Introduction to Communications System
transmit
data, instruction
s, or information
Communication channel or
transmission media :telephone
line, cable, airwave
Sending device:
computer, fax
machine
medium on which the
data, instructions, or
information travel
modem
connects the sending or
receiving device to a
communication channel
Communication device:
modem
accepts the
transmission
of
data, instructi
ons, or
information
Receiving device :
computer, fax
machine
7. Servers
• Sometimes called the host computer
• Support from two to several thousands connected
computers at the same time.
8. Purpose of Servers
• The purpose of
server is to control
access to the
hardware, software,
and other resources
on the network .
• Provides a
centralized storage
area for
programs, data, and
information.
9. Types of Servers
• Some servers, called dedicated servers, perform
a specific task.
• Examples:
1. File server stores and manages files.
2. Print server manages printers and documents being
printed.
3. Network server manage network traffic (activity).
4. Web server delivers requested Web pages to your
computer.
12. Communication Devices
• A communications device is any type of
hardware capable of transmitting
data, instructions, and information between a
sending device and a receiving device
• Examples:
1.
2.
3.
4.
5.
Modem
Network cards
Wireless access point
Routers
Hubs and switches
14. Communication Devices
- Modem
• One type of communication device that connects a
communications channel to a sending or receiving
device is a MODEM.
• The function of MODEM is to convert digital signals to
analog signal and analog signal to digital, so that data
can travel along an analog telephone line.
• Types of MODEMs:
1. Dial up modems
2. Digital modem
3. Wireless modem
15. Communication Devices
- Modem
• A dial-up modem converts signals between
analog and digital, so that data can travel along
an analog telephone line. Usually is in the form of
adapter card.
16. Communication Devices
- Modem
• A digital modem sends and receives data and
information to and from a digital line.
– Three types of digital modems are:
1. ISDN (Integrated Services Digital Network)
modem – use ISDN line
2. DSL (Digital Subscriber Line) – use DSL line
3. Cable modem – called broadband modem, over
the cable television network.
18. Communication Devices
- Modem
• A wireless modem uses the cell phone network to
connect to the Internet wirelessly from a notebook
computer, a smart phone, or other mobile device
• Wireless modem have an external or build-in
antenna, are available as USB flash drive.
19. Communication Devices
- Network Cards
• A network card enables a
computer or device that does not
have build in networking capability
to access a network.
• Available in a variety of styles:
– Desktop computer: is an adapter card
that has a port to which a cable
connects.
– Mobile computer: USB network
adapter, ExpressCard module, or PC
Card.
20. Communication Devices
- Wireless Access Points
• A wireless access point is a central
communications device that allows
computers and devices to transfer
data wirelessly among themselves
or to a wired network.
• It has high quality antennas for
optimal signals and suggest
positioning at the highest possible
location.
21. Communication Devices
- Routers
• A router connects multiple computers or
other routers together and transmits data to
its correct destination on a network.
– Example:
– Home network – router allows multiple
computers to share a single high speed
Internet connection such as through a
cable modem/DSL modem.
• To prevent unauthorized users from accessing
files and computer, many are protected by a
build-in firewall.
22. Communication Devices
- Hubs & Switches
• A hub/ switch is a device that provides a central point for
cables in a network.
• Larger networks typically use a hub, while smaller networks
use a switch.
• Some hubs/switches include routers. That is, the hub/
switch receives data from many directions and then forward
it to one or more destinations.
23. Communication Over Telephone
Network
• The public switched telephone network (PSTN) is
the worldwide telephone system that handles
voice oriented telephone calls.
• The telephone network is an integral part of
computer communication.
• Data, instructions, and information are
transmitted over the telephone network using
dial up lines or dedicated lines.
25. Communication Over Telephone
Network
• Various types of lines that use the
telephone
• network for data communications.
Dial-up
lines
Dedicated
line
FTTP
ISDN line
T-carrier
line
ATM
DSL
26. Dial-up Lines vs. Dedicated Lines
• A dial-up line is a temporary connection that
uses analog telephone lines for communications.
• A dedicated line is a type of always-on
connection that uses analog or digital lines.
• A dedicated line are better than dial up because
dedicated lines provide a constant connection.
• Five types of digital dedicated lines are ISDN
lines, DSL, FTTP, T-carrier lines, and ATM.
27. ISDN vs. DSL
• ISDN (Integrated Services Digital Network) lines
is a set of standards for digital transmission of
data over standard telephone lines.
• DSL (Digital Subscriber Line) transmit at fast
speeds on standard telephone lines with both
voice and data communications.
28. ADSL
• ADSL (Asymmetric DSL) is a type of DSL that supports
faster transfer rates when receiving data (download)
than when sending data (upload).
• ADSL connections transmit data downstream at a much
faster rate than upstream
29. SDSL
• SDSL (Symmetric DSL) is a type of DSL that offers
symmetric bandwidth upstream and downstream
• SDSL connections transmit data only and does not
support analog calls.
30. FTTP
• FTTP (Fiber to
the Premises)
uses fiberoptic cable to
provide
extremely
high-speed
Internet
access.
32. T-Carrier Lines vs. ATM
• T-carrier line is a long-distance digital telephone
line that carry multiple signals over a single
communications line.
• ATM (Asynchronous Transfer Mode) is a service
that carries voice, data, video, and multimedia
at very high speeds.
34. Communication Channel
• It is the transmission media on which
data, instructions travel in a communications
system.
• Common terms:
– The amount of data that can travel over a
communications channel sometimes is called the
bandwidth
– Latency is the time it takes a signal to travel from
one location to another on a network
– Transmission media consists of materials capable of
carrying one or more signals
– Broadband media transmit multiple signals
simultaneously
36. Communication Channel
• Transmission media are one of two types:
1. Physical transmission media
• Use wire, cable, and other tangible materials to send
communication signal.
• Examples:
1.
2.
3.
Twisted pair cable
Coaxial cable
Fiber optic cable
2. Wireless transmission media
• Send communications signals through the air or space
using radio, microwave, and infrared signal.
38. Physical Transmission Media
-Twisted-Pair Cable
• Widely used in network cabling and telephone
systems.
• Twisted-pair cable consists of one or more twistedpair wires bundled together.
• Each twisted pair wire consists of two separate
insulated copper wires that are twisted together.
• The wires are twisted together to reduce noise.
Noise is an electrical disturbance that can degrade
communications.
• Commonly used for telephone lines
• Speed: 1 – 128 Mbps
40. Physical Transmission Media
-Coaxial Cable
• Coaxial cable consists of a
single copper wire surrounded
by three layers:
- insulating material
- woven or braided metal
- plastic outer coating.
• Commonly used for cable
television network wiring
• Speed: Up to 200 Mbps
Coaxial cable
41. Physical Transmission Media
-Fiber-Optic Cable
• Fiber-optic cable
consists of strands
of glass (called
optical fibers) that
use light to
transmit signals.
• Speed:100 Mbps
to 2 Gbps
Fiber-optic cable
42. Physical Transmission Media
-Fiber-Optic Cable
• Advantages:
– Carry more signals than wire cables
– Faster data transmission
– Less susceptible to noise, hence better security
– Smaller size
• Disadvantages:
– Costs more than twisted-pair and coaxial cable
– Difficult to install and modify
44. Wireless Transmission Media
-Infrared & Broadcast Radio
• Infrared (IR) is a wireless transmission medium that
sends signals using infrared light waves.
– Communicate over short distance.
– Use in mouse, printers, digital cameras, and hand
phone.
• Broadcast radio is a wireless transmission medium
that distributes radio signals through the air over a
long distances.
– Example: Bluetooth
45. Wireless Transmission Media
-Cellular Radio
• Cellular radio is a form of broadcast radio that is
used widely for mobile communications.
specifically wireless modems and cell phones.
– Several categories of cellular transmission:
•
•
•
•
1G transmit analog data
2G transmit digital data at speeds from 9.6kbps to 19.2kbps
3G transmit digital data at speeds from 144kbps to 2.4Mbps
4G transmit digital data at speeds up to 15Mbps
47. Wireless Transmission Media
-Microwaves
Line-of-sight
transmission- must
transmit in straight
line with no
obstructions
• Microwaves are radio
waves that provide a
high-speed signal
transmission.
• Often called fixed
wireless, involves
sending signals from one
Microwave
microwave station to
station /
another.
earth-based
station
Microwave stations
need to be placed
within 25-30 miles of
each other
48. Wireless Transmission Media
-Communication Satellite
• A communications satellite
is a space station that
receives microwave signals
from an earth-based
station, amplifies it, and
broadcasts the signal over a
wide area
Applications such as air
navigating, television and radio
broadcast, weather
forecasting, video
conferencing, paging, global
positioning systems, and Internet
connections use communications
satellite.
An example of a communication system. Some devices that serve as sending devices and receiving devices are mainframe computers, servers, desktop computers, notebook computers, smart phones, Internet-enabled portable media players, handheld game consoles, and GPS receivers. The communication channel consists of telephone and power lines, cable television and other underground lines, microwave stations, and satellites.
