Network media refers to the physical paths over which electrical signals travel between network components. There are two types of network transmission: bounded/guided transmission, where signals are confined to a specific path using cables like twisted-pair, coaxial, or fiber-optic; and unbound transmission, which extends beyond cabling and includes radio waves, microwaves, and infrared waves. Unbound transmission provides larger bandwidth and wide area capabilities but operates at very high frequencies. Common methods for reducing noise in network signals include signal averaging, analog filtering using passive low-pass and high-pass filters, and active filters which incorporate amplifying components.
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 (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.
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 (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.
One way to categorize the different types of computer network designs is by their scope or scale. For historical reasons, the networking industry refers to nearly every type of design as some kind of area network. Common types of area networks are:
LAN - Local Area Network
WAN - Wide Area Network
WLAN - Wireless Local Area Network
MAN - Metropolitan Area Network
SAN - Storage Area Network, System Area Network, Server Area Network, or sometimes Small Area Network
CAN - Campus Area Network, Controller Area Network, or sometimes Cluster Area Network
PAN - Personal Area Network
LAN and WAN are the two primary and best-known categories of area networks, while the others have emerged with technology advances
For beginners in Computer Networking field, know about basics about what is Computer Networks, what are ways through which we can communicate, what is meant by protocols, he famous OSI its layers and TCP/IP and its layers, What makes a Networking Device, basic topologies of Computer Networks, special purpose network devices like Switch, routers, repeter, bridges and hub, and basics of networking methods, basics of ethernet, TCP its characteristics, UDP, TCP vs UDP, One would wonder what happens when information particular to each layer is read by the corresponding protocols at target machine or why is it required?
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.
One way to categorize the different types of computer network designs is by their scope or scale. For historical reasons, the networking industry refers to nearly every type of design as some kind of area network. Common types of area networks are:
LAN - Local Area Network
WAN - Wide Area Network
WLAN - Wireless Local Area Network
MAN - Metropolitan Area Network
SAN - Storage Area Network, System Area Network, Server Area Network, or sometimes Small Area Network
CAN - Campus Area Network, Controller Area Network, or sometimes Cluster Area Network
PAN - Personal Area Network
LAN and WAN are the two primary and best-known categories of area networks, while the others have emerged with technology advances
For beginners in Computer Networking field, know about basics about what is Computer Networks, what are ways through which we can communicate, what is meant by protocols, he famous OSI its layers and TCP/IP and its layers, What makes a Networking Device, basic topologies of Computer Networks, special purpose network devices like Switch, routers, repeter, bridges and hub, and basics of networking methods, basics of ethernet, TCP its characteristics, UDP, TCP vs UDP, One would wonder what happens when information particular to each layer is read by the corresponding protocols at target machine or why is it required?
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 general overview of signal encoding
You will learn why to use digital encoding, how signal is transmitted and received and how analog signals are converted to digital
Some digital encoding methods
A presentation prepared by my friend's friend. I have done no editing at all, I'm just uploading the presentation as it is.
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)
It is a digital representation of an analog signal that takes samples of the amplitude of the analog signal at regular intervals. The sampled analog data is changed to, and then represented by, binary data.
The Top Skills That Can Get You Hired in 2017LinkedIn
We analyzed all the recruiting activity on LinkedIn this year and identified the Top Skills employers seek. Starting Oct 24, learn these skills and much more for free during the Week of Learning.
#AlwaysBeLearning https://learning.linkedin.com/week-of-learning
2.a. Wired Media Type and ExplinationTwisted-Pair CableTwiste.pdfaquazac
2.
a. Wired Media Type and Explination:
Twisted-Pair Cable
Twisted-pair cable is a type of cabling that is used for telephone communications and most
modern Ethernet networks. A pair of wires forms a circuit that can transmit data. The pairs are
twisted to provide protection against crosstalk, the noise generated by adjacent pairs. When
electrical current flows through a wire, it creates a small, circular magnetic field around the wire.
When two wires in an electrical circuit are placed close together, their magnetic fields are the
exact opposite of each other. Thus, the two magnetic fields cancel each other out. They also
cancel out any outside magnetic fields. Twisting the wires can enhance this cancellation effect.
Using cancellation together with twisting the wires, cable designers can effectively provide self-
shielding for wire pairs within the network media.
Two basic types of twisted-pair cable exist: unshielded twisted pair (UTP) and shielded twisted
pair (STP). The following sections discuss UTP and STP cable in more detail.
UTP Cable
UTP cable is a medium that is composed of pairs of wires . UTP cable is used in a variety of
networks. Each of the eight individual copper wires in UTP cable \\is covered by an insulating
material. In addition, the wires in each pair are twisted around each other.
UTP cable relies solely on the cancellation effect produced by the twisted wire pairs to limit
signal degradation caused by electromagnetic interference (EMI) and radio frequency
interference (RFI). To further reduce crosstalk between the pairs in UTP cable, the number of
twists in the wire pairs varies. UTP cable must follow precise specifications governing how
many twists or braids are permitted per meter (3.28 feet) of cable.
UTP cable often is installed using a Registered Jack 45 (RJ-45) connector The RJ-45 is an eight-
wire connector used commonly to connect computers onto a local-area network (LAN),
especially Ethernets.
When used as a networking medium, UTP cable has four pairs of either 22- or 24-gauge copper
wire. UTP used as a networking medium has an impedance of 100 ohms; this differentiates it
from other types of twisted-pair wiring such as that used for telephone wiring, which has
impedance of 600 ohms.
UTP cable offers many advantages. Because UTP has an external diameter of approximately
0.43 cm (0.17 inches), its small size can be advantageous during installation. Because it has such
a small external diameter, UTP does not fill up wiring ducts as rapidly as other types of cable.
This can be an extremely important factor to consider, particularly when installing a network in
an older building. UTP cable is easy to install and is less expensive than other types of
networking media. In fact, UTP costs less per meter than any other type of LAN cabling. And
because UTP can be used with most of the major networking architectures, it continues to grow
in popularity.
Disadvantages also are involved in using twisted-pair cabling, howe.
this topic covered guided media including twisted pair cable, coaxial cable and fiber optic cable and their working process advantages and applications.
IT Infrastructure and Network Technologies - Finals by Mark John LadoMark John Lado, MIT
Objectives:
1. Explain how the Transmission Mediums in Computer Networks being used.
2. Explain the function of Bounded or Guided Transmission Media.
3. Give meaning about Unbounded or Unguided Transmission Media.
4. Recognize the functions of different Transmission Media like Radio Waves, Micro Waves, Terrestrial Microwave, Satellite Microwave, and Infrared Waves
This is a notes about Cables & Connectors of computer networks. It contain details about the information of different types of cables- twisted pair cable, coaxial cable, fiber optical cable, crossover cable , straight through cable, STP/UTP cables & about their connectors.
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
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.
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.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
How to Make a Field invisible in Odoo 17Celine George
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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”.
2. Network media is the actual path over
which an electrical signal travels as it
moves from one component to
another.
NETWORK MEDIA
3. TWO TYPES OF NETWORK
TRANSMISSION
1.Bounded/Guided Transmission
2. Unbound Transmission
NETWORK MEDIA
4. 1.Bounded/Guided Transmission
Media
It is the transmission media in which
signals are confined to a specific path
using wire or cable. The types of
Bounded/ Guided are twisted-pair
cable, coaxial cable, fiber-optic cable,
and wireless
NETWORK MEDIA
5. 2.Unbound transmission
media extend beyond the limiting
confines of cabling.
They provide an excellent
Communication Networks
alternative for WANS.
NETWORK MEDIA-UNBOUND
6. 2.Unbound transmission media . The
lack of physical restrictions provides
larger bandwidth as well as wide area
capabilities. Unbound media typically
operate at very high frequencies. The
three types of unbound transmission
media are: Radio wave, Micro wave,
Infrared.
NETWORK MEDIA-UNBOUND
7. Unbound transmission media -
three types of unbound
transmission media are: Radio
wave, Micro wave, Infrared.
NETWORK MEDIA-UNBOUND
8. 1.Radio waves are prevalent
and well understood, we are
just beginning to realize their
enormous potential as a
networking medium. Radio
waves can operate on a single
or multiple frequency bands..
NETWORK MEDIA-UNBOUND
9. Radiowaves are omni
directional i.e. they travel in
all the directions from the
source. Because of this
property, transmitter and
receiver need not to be
aligned.
NETWORK MEDIA-UNBOUND
10. 1. Radiowaves can penetrate
buildings easily, so they are
widely use for communication
both indoors outdoors.
NETWORK MEDIA-UNBOUND
11. NETWORK MEDIA-UNBOUND
At high frequencies, radiowaves tends to
travel in straight line and bounce off the
obstacles. They are also absorbed by rain.
12. NETWORK MEDIA-UNBOUND
Radiowaves me widely used for AM and FM
radio, television, cordless telephone, cellular
phones, paging and wireless LAN.
13. NETWORK MEDIA-UNBOUND
2. Microwave Transmission
Microwaves have been used in data
communications for a long time. They have a
higher frequency than radio waves and
therefore can handle larger amounts of data.
14. NETWORK MEDIA-UNBOUND
Microwave transmission is line of sight
transmission. The transmit station must be in
visible contact with the receive station. This
sets a limit on the distance between stations
depending on the local geography. Typically
the line of sight due to the Earth's curvature
is only 50 km to the horizon!
15.
16. NETWORK MEDIA-UNBOUND
3.Infrared- offers a great unbound
photonic solution. Like fiber-optic
cabling, infrared communications
use light, so they are not bound by
the limitations of electricity.
17. NETWORK MEDIA-UNBOUND
Infra Red.
Infrared transmission refers to
energy in the region of the
electromagnetic radiation spectrum
at wavelengths longer than those of
visible light, but shorter than those
of radio waves
20. Twisted-Pair Cable
Twisted-pair cable is a type of cabling that is used for
telephone communications and most modern
Ethernet networks. A pair of wires forms a circuit that
can transmit data. The pairs are twisted to provide
protection against crosstalk, the noise generated by
adjacent pairs. When electrical current flows through
a wire, it creates a small, circular magnetic field
around the wire.
NETWORK MEDIA
21. Twisted-Pair Cable
When two wires in an electrical circuit are placed close
together, their magnetic fields are the exact opposite of each
other. Thus, the two magnetic fields cancel each other out.
NETWORK MEDIA
22. Twisted-Pair Cable
They also cancel out any outside magnetic fields.
Twisting the wires can enhance this cancellation
effect. Using cancellation together with twisting the
wires, cable designers can effectively provide self-
shielding for wire pairs within the network media.
NETWORK MEDIA
23. Two basic types of twisted-pair cable exist: unshielded
twisted pair (UTP) and shielded twisted pair (STP). The
following sections discuss UTP and STP cable in more
detail.
NETWORK MEDIA
24. UTP Cable
UTP cable is a medium that is composed of pairs of
wires (see Figure 8-1). UTP cable is used in a variety of
networks. Each of the eight individual copper wires in
UTP cable is covered by an insulating material. In
addition, the wires in each pair are twisted around
each other.
NETWORK MEDIA
26. UTP cable often is installed using a
Registered Jack 45 (RJ-45)
connector (see Figure 8-2). The RJ-
45 is an eight-wire connector used
commonly to connect computers
onto a local-area network (LAN),
especially Ethernets.
NETWORK MEDIA
28. Although UTP was once considered to be
slower at transmitting data than other types of
cable, this is no longer true. In fact, UTP is
considered the fastest copper-based medium
today.
NETWORK MEDIA
29. The following summarizes the features of UTP
cable:
Speed and throughput—10 to 1000 Mbps
Average cost per node—Least expensive
Media and connector size—Small
Maximum cable length—100 m (short)
NETWORK MEDIA
30. Commonly used types of UTP cabling are as follows:
Category 1—Used for telephone communications. Not suitable
for transmitting data.
Category 2—Capable of transmitting data at speeds up to 4
megabits per second (Mbps).
Category 3—Used in 10BASE-T networks. Can transmit data at
speeds up to 10 Mbps.
NETWORK MEDIA
31. Commonly used types of UTP cabling are as follows:
Category 4—Used in Token Ring networks. Can transmit data at
speeds up to 16 Mbps.
Category 5—Can transmit data at speeds up to 100 Mbps.
Category 5e —Used in networks running at speeds up to 1000
Mbps (1 gigabit per second [Gbps]).
Category 6—Typically, Category 6 cable consists of four pairs of
24 American Wire Gauge (AWG) copper wires. Category 6 cable
is currently the fastest standard for UTP.
NETWORK MEDIA
32. Shielded Twisted-Pair Cable
Shielded twisted-pair (STP) cable combines the
techniques of shielding, cancellation, and wire
twisting. Each pair of wires is wrapped in a metallic foil
The four pairs of wires then are wrapped in an overall
metallic braid or foil, usually 150-ohm cable.
NETWORK MEDIA
33. Shielded Twisted-Pair Cable
Shielded twisted-pair -As specified for use in Ethernet
network installations, STP reduces electrical noise
both within the cable (pair-to-pair coupling, or
crosstalk) and from outside the cable
. STP usually is installed with STP data connector,
which is created especially for the STP cable. However,
STP cabling also can use the same RJ connectors that
UTP uses.
NETWORK MEDIA
35. Although STP prevents interference better than
UTP, it is more expensive and difficult to install.
In addition, the metallic shielding must be
grounded at both ends.
NETWORK MEDIA
36. If it is improperly grounded, the shield acts like
an antenna and picks up unwanted signals.
Because of its cost and difficulty with
termination, STP is rarely used in Ethernet
networks.
NETWORK MEDIA
37. STP is primarily used in Europe.
The following summarizes the features of STP
cable:
Speed and throughput—10 to 100 Mbps
Average cost per node—Moderately expensive
Media and connector size—Medium to large
Maximum cable length—100 m (short)
NETWORK MEDIA
38. When comparing UTP and STP, keep the
following points in mind:
The speed of both types of cable is usually
satisfactory for local-area distances.
These are the least-expensive media for data
communication.
NETWORK MEDIA
39. UTP is less expensive than STP.
Because most buildings are already wired with
UTP, many transmission standards are adapted
to use it, to avoid costly rewiring with an
alternative cable type.
NETWORK MEDIA
40. Coaxial Cable
Coaxial cable consists of a hollow outer
cylindrical conductor that surrounds a single
inner wire made of two conducting
elements.
NETWORK MEDIA
41. Coaxial Cable
. One of these elements, located in
the center of the cable, is a copper
conductor. Surrounding the copper
conductor is a layer of flexible
insulation.
NETWORK MEDIA
43. Coaxial cable supports 10 to 100
Mbps and is relatively inexpensive,
although it is more costly than UTP on a per-unit
length. However, coaxial cable can be cheaper for
a physical bus topology because less cable will be
needed.
NETWORK MEDIA
44. Coaxial cable can be cabled over longer distances than
twisted-pair cable. For example, Ethernet can run
approximately 100 meters (328 feet) using twisted-
pair cabling. Using coaxial cable increases this distance
to 500m (1640.4 feet).
NETWORK MEDIA
45. Fiber Optics is sending signals down hair-thin strands
of glass or plastic fiber. The light is “guided” down the
center of the fiber called the “core”. The core is
surrounded by a optical material called the “cladding”
that traps the light in the core using an optical
technique called “total internal reflection.”
NETWORK MEDIA
46. Fiber Optics The core and cladding are usually made of
ultra-pure glass. The fiber is coated with a protective
plastic covering called the “primary buffer coating”
that protects it from moisture and other damage.
More protection is provided by the “cable” which has
the fibers and strength members inside an outer
covering called a “jacket”.
NETWORK MEDIA
48. NETWORK MEDIA
Media Type Maximum Segment
Length
Speed Cost Advantages Disadvantages
UTP 100 m 10 Mbps to 1000
Mbps
Least expensive Easy to install; widely
available and widely
used
Susceptible to
interference; can
cover only a limited
distance
STP 100 m 10 Mbps to 100 Mbps More expensive than
UTP
Reduced crosstalk;
more resistant to EMI
than Thinnet or UTP
Difficult to work with;
can cover only a
limited distance
Coaxial 500 m (Thicknet)
185 m (Thinnet)
10 Mbps to 100 Mbps Relatively
inexpensive, but
more costly than UTP
Less susceptible to
EMI interference than
other types of copper
media
Difficult to work with
(Thicknet); limited
bandwidth; limited
application (Thinnet);
damage to cable can
bring down entire
network
Fiber-Optic 10 km and farther
(single-mode)
2 km and farther
(multimode)
100 Mbps to 100
Gbps (single mode)
100 Mbps to 9.92
Gbps (multimode)
Expensive Cannot be tapped, so
security is better; can
be used over great
distances; is not
susceptible to EMI;
has a higher data rate
than coaxial and
twisted-pair cable
Difficult to terminate
49. Single Mode fiber optic cable has
a small diametral core that allows
only one mode of light to
propagate.
NETWORK MEDIA-SINGLE MODE FIBER OPTIC
50. Because of this, the number of light
reflections created as the light passes
through the core decreases, lowering
attenuation and creating the ability
for the signal to travel faster, further..
NETWORK MEDIA-SINGLE MODE FIBER OPTIC
51. Single Mode This application is
typically used in long distance, higher
bandwidth runs by Telcos, CATV
companies, and Colleges and
Universities.
NETWORK MEDIA-SINGLE MODE FIBER OPTIC
52. Multimode fiber optic cable has a
large diametral core that allows
multiple modes of light to propagate.
NETWORK MEDIA-MULTI MODE FIBER OPTIC
53. Because of this, the number of light
reflections created as the light passes
through the core increases, creating
the ability for more data to pass
through at a given time.
NETWORK MEDIA-MULTI MODE FIBER OPTIC
54. Because of the high dispersion and
attenuation rate with this type of
fiber, the quality of the signal is
reduced over long distances. This
application is typically used for short
distance, data and audio/video
applications in LANs.
NETWORK MEDIA-MULTI MODE FIBER OPTIC
55. RF broadband signals, such as what
cable companies commonly use,
cannot be transmitted over
multimode fiber.
NETWORK MEDIA-MULTI MODE FIBER OPTIC
56. Wireless communication uses
radio frequencies (RF) or infrared
(IR) waves to transmit data
between devices on a LAN. For
wireless LANs, a key component is
the wireless hub, or access point,
used for signal distribution
NETWORK MEDIA
58. NETWORK MEDIA- FREE SPACE OPTIC
FSO is a line-of-sight technology which uses LASERS and
Photo detectors to provide optical connections
between two points—without the fiber.
FSO can transmit data, voice or video at speeds capable
of reaching 2.5 Gbps.
59. NETWORK MEDIA- FREE SPACE OPTIC
FSO units consist of an optical transceiver with a laser
(transmitter) and a Photo detector (receiver) to provide
full duplex (bi-directional) capability.
FSO systems use invisible infrared laser light
wavelengths.
60. Requirements of a good Transmission System:
• High Bandwidth
• High BER
• Low SNR
• Power efficient
• Provide Data Security.
• Low cost
• Easy to install and maintain.
61. A high-bandwidth cost-effective solution to the last mile problem is to use free-space
laser communication (also known as or optical wireless) in a mesh architecture to get
the high bandwidth quickly to the customers.
• NETWORK MEDIA-free space optics
62. Wi-Fi (or WiFi) is a local area wireless computer
networking technology that allows electronic
devices to connect to the network,
NETWORK MEDIA-wifi
63. Wi-Fi technology may be used to
provide Internet access to devices that are
within the range of a wireless network that is
connected to the Internet. The coverage of one
or more interconnected access
points (hotspots) can extend from an area as
small as a few rooms to as large as many square
kilometers. Coverage in the larger area may
require a group of access points with
overlapping coverage
NETWORK MEDIA-wifi
64. Wi-Fi provides service in private
homes, businesses, as well as in
public spaces at Wi-Fi hotspots set
up either free-of-charge or
commercially, often using a
captive portal webpage for access.
NETWORK MEDIA-wifi
65. Organizations and businesses, such as
airports, hotels, and restaurants,
often provide free-use hotspots to
attract customers. Enthusiasts or
authorities who wish to provide
services or even to promote business
in selected areas sometimes provide
free Wi-Fi access.
NETWORK MEDIA-wifi
66. Routers that incorporate a DSL-
modem or a cable modem and a Wi-Fi
access point, often set up in homes
and other buildings, provide Internet
access and internetworking to all
devices connected to them, wirelessly
or via cable.
NETWORK MEDIA-wifi
67. NOISE REDUCTION
Signal Averaging Some noise
reduction techniques prevent the
noise from entering the system
initially, and others remove
extraneous noise from the signal.
Another technique averages several
signal samples through software.
NETWORK MEDIA-NOSE REDUCTION
METHODS
68. NOISE REDUCTION
Signal Averaging-As such, averaging
suits only low-speed applications, and
it eliminates only random noise. It
does not necessarily eliminate many
other types of annoying system noise,
such as periodic noise from switching
power supplies.
NETWORK MEDIA-NOSE REDUCTION
METHODS
69. NOISE REDUCTION-
Analog Filtering A filter is an analog circuit
element that selectively attenuates a
particular band of frequencies in an
incoming signal. Filter circuits can be
passive or active. Depending on whether
the filter is low or high-pass, it determines
the frequencies that are attenuated above
or below the cutoff frequency.
NETWORK MEDIA-NOSE REDUCTION
METHODS
71. NOISE REDUCTION-06). Noise
Reduction:
A passive filter is a circuit or device
consisting entirely of non-amplifying
components, typically inductors and
capacitors, which pass one frequency
band while rejecting others.
NETWORK MEDIA-NOSE REDUCTION
METHODS
73. NOISE REDUCTION-) Noise Reduction:
An active filter, on the other hand, is a
circuit or device composed of
amplifying components such as
operational amplifiers, and suitable
tuning elements, typically resistors
and capacitors, which pass one
frequency band while rejecting others
NETWORK MEDIA-NOSE REDUCTION
METHODS