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Telecom, Wireless

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Chapter 5 Telecom, Wireless & Networks Fundamentals Media, Devices, and Software Wireless Telecommunications Networks and Distributed Computing Please discontinue use ... – PowerPoint PPT presentation

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Title: Telecom, Wireless


1
Telecom, Wireless Networks
Chapter 5
  • Fundamentals
  • Media, Devices, and Software
  • Wireless Telecommunications
  • Networks and Distributed Computing

2
Telecommunications
  • Telecommunications The electronic transmission
    of signals over a medium for communications.

(cables or air)
Sender and Receiver must speak the same
language.
3
Voice Communication
  • It has been said that only about 16 of spoken
    communication is verbal
  • Sound waves
  • demo
  • demo
  • Wave characteristics
  • Frequency
  • Amplitude
  • Phase

4
Types of Signals
5
Modulation
  • More about waves
  • Different waves
  • Electromagnetic waves
  • Analog modulation
  • AM
  • FM

Examples
6
Digital Modulation
What might FSK Look like?
7
Signal Frequency
  • Frequency the speed at which a signal changes
    from high to low.
  • Bandwidth the range of signal frequencies that
    can be sent over a given medium at the same time.
  • Often expressed as bits per second
  • Broadband typically 2 5 Mbps

8
5.2 Networking Media, Devices, and Software
  • The fundamental components of telecommunications
    networks

9
Networking Media
10
Radio Waves
  • Radio waves use differing frequencies to carry
    many types of information
  • AM FM Radio
  • Short Wave CB Radio
  • Television Broadcasts
  • Garage Doors Openers
  • Baby Monitors
  • Cordless Phones
  • Cell Phones
  • Radio Controlled Cars and Airplanes
  • Global Positioning Systems
  • Wireless Computer Networks
  • Microwave Communications

http//electronics.howstuffworks.com/radio-spectru
m1.htm
11
300 GHz
EHF
SHF
UHF
VHF
HF
MF
LF
VLF
30 GHz
2.9 GHz
Deep space radio communications (2.29-2.3 GHz)
Wi-fi Wireless Networks (2.4 GHz)
Global Positioning System 1.23 and 1.58 GHz
Air traffic Control (960-1,215 MHz)
900-MHz cordless phones
Cell Phones (824-849 MHz)
328.6 MHz
TV CH 7-13 (174-220 MHz)
FM Radio (88-108 MHz)
TV CH 2-6 (54-88 MHz)
Cordless Phones (40-50 MHz)
30 MHz
CB Radio (26.96-27.41 MHz)
3 MHz
AM Radio (535-1700 kHz)
300kHz
30 kHz
The complete picture
10 kHz
The Radio Spectrum
12
Networking Devices
  • Modem modulates and demodulates signals from one
    form to another.
  • Network Adapter Expansion card, or external
    device installed on a computing device used to
    connect to a network.

13
Networking Devices
  • Network Control Devices
  • Hub/Switch
  • Controls flow of data between devices on a
    network
  • Router
  • Routs packets to destinations and connects one
    network to another
  • Wireless Access Point
  • Allows devices to connect wirelessly to a wired
    network

14
(No Transcript)
15
Microwave Communications
16
Microwave Communications
!
Line-of-sight communications
17
Microwave Communications
Line-of-sight required
18
5.3 Wireless Telecommunications Technologies
19
Cell Phone Technologies
  • A cellular network is a radio network in which a
    geographic area is divided into cells, with a
    transmission tower and station at the center of
    each cell, to support mobile communications.

20
Cell Phone Technologies
  • A cellular carrier is a company that builds and
    maintains a cellular network and provides cell
    phone service to the public.

21
GSM and CDMA
GSM CDMA
ATT T-Mobile Verizon Sprint
  • Digital networking standards for cell phone
    networks are GSM and CDMA.
  • GSM is the most popular global standard for
    mobile phones
  • The CDMA networking standard is predominantly
    used in the United States where it is in equal
    competition with GSM.

22
GSM and CDMA
GSM CDMA
ATT T-Mobile Verizon Sprint
  • GSM Phones include a subscriber identity module
    (SIM) for security and convenient data transfer
    between phones.

23
Wireless Technologies
  • The Global Positioning System (GPS) uses
    satellites to pinpoint the location of receivers
    on earth.

Aircraft Navigation
How GPS works
24
Wireless Technologies
  • Wireless Fidelity (IEEE 802.11s), or Wi-fi, is
    wireless networking technology that makes use of
    access points to connect devices to networks.
  • 250-1,000 ft range
  • 802.11b 4.5 Mbps
  • 802.11g 11 Mbps
  • 802.11n 74 Mbps
  • www.boingo.com

25
Wireless Technologies
  • WiMAX (IEEE 802.16) is the next generation
    broadband technology that is both faster and has
    a longer range than Wi-fi 31 miles!

Seattles Space Needle To Become WiMax Antenna
http//en.wikipedia.org/wiki/WiMAX
26
Wireless Technologies
  • Bluetooth is wireless technology that enables a
    wide variety of digital devices to communicate
    directly.
  • 33 ft range
  • 1 Mbps
  • www.bluetooth.com

27
Bluetooth
28
Wireless Technologies
  • Infrared (IrDA) technology utilizes infrared rays
    to send data over a short distance wirelessly.
  • 14 ft range
  • Narrow-angle cone (30o)
  • Line-of-sight
  • 4-16 Mbps
  • www.mzoop.com

29
Wireless Comparison
Wi-fi Access point centered LAN Omni-direction Through obstructions 250 ft range indoors 11 Mbps
Bluetooth Point-to-point Omni-direction Through obstructions 33 ft 1 Mbps
Infrared Point-to-point Narrow-angle Line-of-sight 14 ft 4 Mbps
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