Telecommunications and Networks

1
Telecommunications and Networks

• Chapter 6

2
Learning Objectives

• Define communications and telecommunications.
• Describe the components of a telecommunications
  system.
• Identify briefly discuss several
  telecommunications applications.
• Identify the benefits of a network.

3
Learning Objectives

• Identify 3 basic types of communications media
  and the characteristics of each.
• Identify telecommunications hardware and the role
  each plays.
• Name 3 distributed processing alternatives
  their features.
• Define network topology identify five
  alternatives.

4
Overview of Telecommunications Systems
5
Fig 6.1
6
Fig 6.2
7
Communication Flow

• Synchronous communication
• Asynchronous communication

8
Fig 6.3
9
Data Transmission Speeds

• Measured in bits per second (bps)
• Kilobits per second (kbps)
• Megabits per second (Mbps)
• Gigabits per second (Gbps)

10
Computer Networks

• Telecommunications media
• Telecommunications devices
• Software
• Hardware devices

11
Telecommunications Media
12
Types of Media

• Twisted Pair
• Coaxial Cable
• Fiber-Optic Cable
• Microwave Transmission

13
Twisted Pair

• Fig 6.4

14
Coaxial Cable

• Fig 6.5

15
Fiber Optic Cable

• Fig 6.6

16
Microwave Transmission

• Fig 6.7

17
Satellite

• Fig 6.8

18
Cellular

• Fig 6.9

19
Infrared Transmission

• Line of sight
• Short distances

20
Telecommunications Devices
21
Modems

• Analog signals continuous
• Digital signals discrete
• Modulation translating digital data to analog
• Demodulation translating analog data to digital
• Modems modulate demodulate data

22
Fig 6.10
23
Fig 6.11
24
Fig 6.12
25
Carriers and Services
26
Carriers

• Common carriers
• Long distance carriers
• Value-added carriers
• Special purpose carriers
• Additional services

27
Services

• Line types
• Switched
• Dedicated
• Private Branch Exchange (PBX)
• Wide-area telecommunications service (WATS)
• Phone dialing services

28
Services

• Digital subscriber lines (DSL)
• Integrated Services Digital Network (ISDN)
• T1 Carrier

29
Table 6.1
30
Networks Distributed Processing
31
Basic Processing Strategies

• Centralized processing
• Decentralized processing
• Distributed processing

32
Network Concepts Considerations

• Network topology
• Network types
• Local Area Networks
• Wide Area Networks
• International networks
• Home small business networks

33
Fig 6.15
34
Network Types

• Logical Area Network (LAN)
• Limited geographical area
• Any topology possible
• Network Interface Card (NIC)
• Designs
• Peer-to-peer
• Client-server
• Wide Area Network (WAN)

35
Network Types

• International networks
• Global
• Transborder data flows
• Infrastructure differences

36
Fig 6.18
37
Connecting Computers in a Distributed System

• Terminal-to-Host
• File Server
• Client/Server

38
Fig 6.19
39
Fig 6.20
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Fig 6.21
41
Communications Software and Protocols
42
Communications Software

• Error checking
• Message formatting
• Security
• Network Operating System (NOS)
• Network Management Software

43
Communications Protocols

• Fig 6.22

44
Network Interconnectivity Technology
45
Fig 6.23
46
Telecommunications Applications
47
Telecommunications Applications

• Voice electronic mail
• Electronic software document distribution
• Telecommuting
• Videoconferencing

48
Fig 6.24
49
Fig 6.25
50
Telecommunications Applications

• Distance learning
• Public Network Services