1. Succeeding with Technology: Second Edition
Chapter 5: Telecommunications, Wireless Technologies, and Computer Networks
Succeeding with Technology: Second Edition

2. Succeeding with Technology
Objectives
Understand the fundamentals of data communications and the criteria for choosing a communications medium
Explain how networking media, devices, and software work together to provide data networking services, and describe the benefits of various types of media
Succeeding with Technology

3. Objectives (continued)
List and describe the most popular forms of wireless telecommunications technologies
List the different classifications of computer networks and their defining characteristics, and understand the basics of wireless home networking
Succeeding with Technology

4. Fundamentals of Telecommunications
Transmission of a signal by way of a medium
Signal
Contains message comprised of data and information
Communication medium
Anything that carries a signal between a sender and a receiver
Succeeding with Technology

5. Succeeding with Technology

6. Telecommunications and Data Communications
Electronic transmission of signals for communications
Data communications
Electronic transmission and reception of digital data
Telecommunications network
Connects communications and computing devices
Networking media
Anything that carries an electronic signal
Succeeding with Technology

7. Succeeding with Technology

8. Characteristics of Telecommunications
Analog signal
Fluctuates continuously
Digital signal
Discrete voltage
State is either high or low
Bandwidth
Data transmission rate
Measured in bits per second (bps)
Broadband
Connection that is always on or active
Succeeding with Technology

9. Succeeding with Technology

10. Succeeding with Technology

11. Networking Media, Devices, and Software – Networking Media
Twisted pair cable
Consists of pairs of twisted wires covered with an insulating layer
Coaxial cable
Consists of an inner conductor wire surrounded by insulation, a conductive shield, and a cover
Fiber-optic cable
Consists of thousands of extremely thin strands of glass or plastic bound together in a sheathing
Succeeding with Technology

12. Succeeding with Technology

13. Succeeding with Technology
Networking Devices
Modems
Modulates and demodulates signals
Cable modem
Provides Internet access over a cable television network
DSL modem
Provides high-speed Internet service over telephone lines
Network adapter
Computer circuit board, PC Card, or USB device
Succeeding with Technology

14. Succeeding with Technology

15. Network Control Devices
Hubs
Used as a central point for connecting a series of computers
Switches
Fundamental part of most networks
Repeaters
Connect multiple network segments
Bridges
Connect two or more network segments
Succeeding with Technology

16. Succeeding with Technology

17. Network Control Devices (continued)
Gateways
Network points that act as an entrance to another network
Routers
Can divide a single network into two logically separate networks
Wireless access point
Receives and transmits data to wireless adapters
Firewall
Device or software that filters the information coming onto a network
Succeeding with Technology

18. Industrial Telecommunications Media and Devices
Microwave transmission
Also called terrestrial microwave
Line-of-sight medium
Communications satellite
Basically a microwave station placed in outer space
Succeeding with Technology

19. Succeeding with Technology

20. Succeeding with Technology

21. Succeeding with Technology
Industrial Hardware
T1 line
Carries twenty-four 64-Kbps signals on one line
T3 line
Carries 672 signals on one line
Devices commonly used to control and protect industrial-level telecommunications:
Multiplexer
Communications processor
Encryption devices
Succeeding with Technology

22. Succeeding with Technology
Networking Software
Monitors the load, or amount of traffic, on the network
Can provide data security and privacy
Network administrator
Person responsible for setting up and maintaining the network
Succeeding with Technology

23. Networking Software (continued)
Network Operating Systems
Perform same functions for network as operating system software performs for a computer
Network Management Software
Facilitates monitoring of individual computers and shared hardware
Communications Protocols and Standards
Ethernet: most widely used network standard for private networks
Succeeding with Technology

24. Wireless Telecommunications Technology - Cell Phone Technologies
Cellular network
A radio network
Geographic area is divided into cells with a transceiver antenna and station at the center of each cell
Cellular carrier
Company that builds and maintains cellular network
Provides cell phone service to the public
Succeeding with Technology

25. Succeeding with Technology

26. Cellular Service Plans
Calling plans are defined by usage in three time frames:
Whenever, or anytime, minutes with no time restrictions
Weeknight minutes
Monday through Friday, 9:00 p.m. to 5:59 a.m. or 6:59 a.m.
Weekend minutes
Saturday 12:00 a.m. to Sunday 11:59 p.m.
Succeeding with Technology

27. Succeeding with Technology

28. Succeeding with Technology
Pagers
Small, lightweight devices that receive signals from transmitters
Types of paging systems
National and regional systems
Set up transmission towers to cover large geographic areas
On-site paging systems
Use small desktop transmitters to send pages over a small wireless network
Succeeding with Technology

29. Global Positioning Systems
Uses satellites to pinpoint the location of objects on earth
Using a GPS receiver and a network of 24 satellites
GPS can tell exact location of receiver on the earth’s surface
GPS
Originally developed for national security and later extended for public use
Succeeding with Technology

30. Succeeding with Technology

31. Wireless Fidelity and WiMAX
Wireless fidelity (Wi-Fi)
Makes use of access points to wirelessly connect users to networks within a range of 250–1000
Standards
Known as the family of standards
Developed by the Institute of Electrical and Electronics Engineers (IEEE)
Developed to support wireless computer networking within a limited range at broadband speeds
Succeeding with Technology

32. Succeeding with Technology

33. Wireless Fidelity and WiMAX (continued)
Known as IEEE
Faster and longer range than Wi-Fi
WiMAX antenna has 31-mile range
Perfect for city-wide Internet access
Seattle’s Space Needle has a WiMAX antenna
Intel and Nokia are strongly supporting WiMAX
Succeeding with Technology

34. Succeeding with Technology
Bluetooth
Enables digital devices to communicate directly with each other wirelessly over short distances
Communicates at speeds of up to 1 Mbps within a range of up to 33 feet (10 meters)
Can connect devices to a computer network using access points like Wi-Fi
Bluetooth and Wi-Fi
Compete in some areas, but have unique qualities
Succeeding with Technology

35. Succeeding with Technology

36. Succeeding with Technology

37. Infrared Transmission
Involves sending signals through the air via light waves
Slower than both Bluetooth and Wi-Fi
Uses light rather than broadcast technology
Ideal for secure data transmissions
Succeeding with Technology

38. Radio Frequency Identification (RFID)
Uses tiny transponders in tags that can be
Attached to merchandise or other objects
Read using an RFID transceiver or reader for the purpose of identification
Primarily used to track merchandise from supplier to retailer to customer
Succeeding with Technology

39. Succeeding with Technology

40. Networks and Distributed Computing
Within a private network
Computing resources are shared in order to maximize computing power
Computer
Includes devices for input, processing, storage, and output
Components can be distributed throughout a computer network
Succeeding with Technology

41. Succeeding with Technology

42. Computer Networking Concepts
Nodes
Devices attached to a network
Workstations
Computers attached to a network
Local resources
Files, drives, or other peripheral devices connected to the workstation and accessible via the network
Network resources
Workstation accesses over the network
Distributed Computing
Multiple remote computers working together
Succeeding with Technology

43. Succeeding with Technology
Network Types
Personal area network (PAN)
Interconnecting personal information technology devices
Local Area Network (LAN)
Connects computer systems within same building
Intranet
Uses protocols of the Internet and the Web within the confines of a private network
Virtual Private Network (VPN)
Enables private Internet communications
Succeeding with Technology

44. Succeeding with Technology

45. Network Types (continued)
Metropolitan area network (MAN)
Connects networks within a city or metropolitan-size area into a larger high-speed network
Wide area network (WAN)
Connects LANs and MANs between cities, across country, and around the world
Global Networks
A WAN that crosses an international border
Electronic Data Interchange (EDI)
Connects corporate computer systems
Succeeding with Technology

46. Succeeding with Technology

47. Succeeding with Technology
Home Networks
Allow residents to
Share a single Internet connection
Share a single printer between computers
Share files such as images, music, and programs
Back up copies of important files to another PC for safekeeping
Participate in multiplayer games.
Share output from devices such as a DVD player or Webcam
Succeeding with Technology

48. Succeeding with Technology
Summary
Telecommunications
Refers to the electronic transmission of signals for communication
Types of cables used in telecommunications
Twisted pair cables, coaxial cable, and fiber optic cable
Networking devices include
Modems, network adapters, network control devices, RFID devices, and pagers
Succeeding with Technology

49. Succeeding with Technology
Summary (continued)
Cellular network
Radio network
Geographic area is divided into cells with a transceiver antenna (tower) and station at the center of each cell
Server computers
Used to distribute data, files, and programs to users, or clients, on the network
Home networks
Used to share hardware, files, and a common Internet connection
Succeeding with Technology