© 2004 ken baldauf, all rights reserved. telecom & networks fundamentals telecom components...
TRANSCRIPT
![Page 1: © 2004 Ken Baldauf, All rights reserved. Telecom & Networks Fundamentals Telecom Components Computer Networks Network Applications Please turn your cell](https://reader036.vdocument.in/reader036/viewer/2022062518/56649de35503460f94ada303/html5/thumbnails/1.jpg)
© 2004 Ken Baldauf, All rights reserved.
Telecom & Networks
Fundamentals Telecom Components Computer Networks Network Applications
Please turn your cell phone off.
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© 2004 Ken Baldauf, All rights reserved.
Fundamentals of Telecommunications
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Telecommunications
Telecommunications: The electronic transmission of signals over a medium for communications.
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Types of Signals
Analog Signal: transmit sound using continuously varying levels of voltage.
Digital Signal: transmits data using two discrete states of voltage: high and low
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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: faster than 200Kbps
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Review: Fundamentals
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Network Media, Devices, and Software
The fundamental components of telecommunications networks
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Networking Media
Coaxial Cable
Fiber Optic Cable
Twisted Pair Cable
Radio Waves
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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://www.fcc.gov/oet/spectrum/ http://www.nrpb.org/understand/radiowaves/radiowaves.htm http://electronics.howstuffworks.com/radio-spectrum1.htm
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High-frequency radio signals sent up to 30 miles through the air.
Microwave Communications
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Microwave Communications
Line-of-sight communications
!
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Microwave CommunicationsSatelliteTransmission
Line-of-sight required
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Global Positioning System (GPS)
GPS: uses satellites to pinpoint the location of receivers on earth.
Aircraft Navigation
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GPS
GPS: uses satellites to pinpoint the location of receivers on earth.
Seacraft Autopilot
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GPS
GPS: uses satellites to pinpoint the location of receivers on earth.
Automobile Navigation
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GPS
GPS: uses satellites to pinpoint the location of receivers on earth. Computing
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GPS
GPS: uses satellites to pinpoint the location of receivers on earth. Handheld Navigation
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GPS
GPS: uses satellites to pinpoint the location of receivers on earth.
Child Safety
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GPS
GPS: uses satellites to pinpoint the location of receivers on earth.
Emergency Call
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© 2004 Ken Baldauf, All rights reserved.
GPS
GPS: uses satellites to pinpoint the location of receivers on earth.
Auto-emergency Call
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Wireless Fidelity (Wi-Fi)
Wi-Fi: devices that communicate wirelessly using the 802.11 protocol.
AccessPoint
• 250-1,000 ft range
• 802.11b 4.5 Mbps
• 802.11g 11 Mbps
• www.boingo.com
• http://talgov.com/citytlh/utilities/ubcs/canopy.html
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Bluetooth Bluetooth: Wireless technology
that enables a wide variety of digital devices to communicate directly.
• 33 ft range
• 1 Mbps
• www.bluetooth.com
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Infrared (IRDA)
Infrared technology utilizes infrared rays to send data over a short distance wirelessly.
• 4 ft range
• Narrow-angle cone (30o)
• Line-of-sight
• 4-16 Mbps
• www.mzoop.com
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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 4 ft 4 Mbps
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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.
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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
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Radio Frequency Identification (RFID)
RFID Device: tiny microprocessor combined with antenna able to store and broadcast identifying information to an RFID reader.
Currently on hold until security issues are addressed.
http://www.technologyreview.com/articles/visualize0304.asp?trk=nl
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© 2004 Ken Baldauf, All rights reserved.
Review: Telecom Components
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Networks and Distributed Computing
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Networking Software
Network Operating System (NOS) system software that controls the communications
between computer systems and devices on a network. Protocols
an agreed-upon format for transferring data between devices.
Standard an agreed-upon way of doing something within an
industry. Ethernet
the most widely used network standard for private networks.
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Computer Network Concepts
Distributed Computing Refers to a computing environment that
includes multiple remote computers that work together to solve problems and provide services. Database Servers Application Servers File Servers Print Servers
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Types of Computer Networks
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Local Area Network (LAN)
Local Area Network (LAN) Connects computer systems and devices
within a common geographic area
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System Administrator
Local Area Network
Startopology
Bustopology
Servers
Wirelessaccess point
switch
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router
router
Wide Area NetworkConnects LANs between cities, cross country, and around the world using microwave and satellite transmission or telephone lines.
FSU Tallahassee LAN
FSU Panama City LAN
WAN
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Global Area Network (GAN)
Global Area Network (GAN) An International network
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Personal Area Network (PAN)
Personal Area Network (PAN) The wireless interconnection of
personal information technology devices within the range of an individual.
Mostly associated with Bluetooth technology
http://www.scottevest.com/v3_product_info/features.shtml
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Network Technologies
Intranet A private network that utilizes Internet
and Web protocols and software. Virtual Private Network (VPN)
Uses the Internet to connect an organization’s networks dispersed around the world into one large intranet.
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PAN – Alternative Definition
Personal Area Network (PAN) The human body is used to conduct a minimal
electric current to transfer information from one individual to another.
The original PAN was designed by Thomas Zimmerman and allowed users to pass digital electronic information through touch, by transferring information from one person’s device to another’s, running a subtle current through the body.
http://www.almaden.ibm.com/cs/user/pan/pan.html
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Exchange emails through handshake
TWO Japanese telecoms giants have developed technology that turns the human body into a broadband-paced link that allows e-mail addresses to be exchanged through a simple handshake, a report said Monday.The technology, developed by Nippon Telegraph and Telephone Corp. and its subsidiary NTT DoCoMo Inc., uses the body's conductivity and adds the smarts of a personal digital assistant (PDA), the Nihon Keizai Shimbun said. A device attached to a PDA can send and receive weak electrical signals through people, with human bodies as communications circuits, the paper said, citing sources close to the companies. Apparel and handbags have their own conductivity, allowing an electrical connection to a PDA that can remain in one's pocket, the paper said. In this way, people can exchange e-mail addresses, names and phone numbers while shaking hands, with the data automatically written into both their PDAs, the paper said. The companies have confirmed in an experiment that data can be transmitted at 10 megabits per second, comparable to the speed of a broadband Internet connection, it said. The technology could allow data communications through door knobs, switches, desks and chairs, the paper said. It could pave the way to one day being able to pass through railway ticket gates or entering secure buildings with a simple touch. It could also get a computer to start up with the proper settings as soon as the user sat down, the paper said. Agence France-Presse
See also “Microsoft patents body power”
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Review: Networks
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Setting Up a Wireless Home Network
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Installing Home Wi-fi
Requirements High-speed Internet Cable Modem or DSL
Modem (provided be ISP)
Wireless Access Point/Router
Wireless adapters for each device.
Additional Access Points as needed. Cable Modem
Wireless Access Point / Router
To Cable Co.
http://www.linksys.com/
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Cable Modem
Wireless Access Point / Router
To Cable Co.
Dangers of Home Wi-fi
Neighbors Hackers
Cable Modem
Wireless Access Point / Router
To Cable Co.
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Dangers of Home Wi-fi
Neighbors Hackers Passer byes
www.wardriving.com
Cable Modem
Wireless Access Point / Router
To Cable Co.
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Dangers of Home Wi-fi
War Driving Kit
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Securing Home Wi-fi
Change the default SSID (network name).
Change the default password needed to access a wireless device.
Enable MAC address filtering.
Disable the SSID broadcast option.
Enable WEP or WPA encryption
Install Firewall SoftwareCable Modem
Wireless Access Point / Router
To Cable Co.
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Review: Wi-fi
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Questions?
Don’t forget to turn your phone back on!!