03-07-2012, 04:23 PM
TELECOMMUNICATIONS AND NETWORKS
[attachment=26569]
OBJECTIVES
What technologies are used in telecommunications systems?
What telecommunications transmission media should our organization use?
How should our organization design its networks?
What alternative network services are available to our organization?
What telecommunications applications can be used for electronic commerce and electronic business?
Telecommunications:
Communication of information by electronic means
Includes digital data transmission as well as voice transmission
Computers to process information
Terminals or any input/output devices that send or receive data
Communications processors
Communications software
Analog signal
Continuous waveform
Passes through communications medium
Used for voice communications
Digital signal
Discrete waveform
Transmits data coded into two discrete states as 1-bits and 0-bits
Used for data communications
Modem
Translates computer’s digital signals into analog and vice versa
Local Area Networks
Require their own dedicated channels
Encompass a limited distance
Gateway, router, Network Operating System (NOS), peer-to-peer
Wireless LANs
Wi-Fi (802.11b) standard: Up to 11 Mbps, low cost, high-speed mobile Internet access, links work groups
Bluetooth standard: Up to 720 Kbps, small personal area networks
Wide Area Networks (WANs)
Span large geographical distance
Consist of variety of cable, satellite, and microwave technologies
Switched lines, dedicated lines
[attachment=26569]
OBJECTIVES
What technologies are used in telecommunications systems?
What telecommunications transmission media should our organization use?
How should our organization design its networks?
What alternative network services are available to our organization?
What telecommunications applications can be used for electronic commerce and electronic business?
Telecommunications:
Communication of information by electronic means
Includes digital data transmission as well as voice transmission
Computers to process information
Terminals or any input/output devices that send or receive data
Communications processors
Communications software
Analog signal
Continuous waveform
Passes through communications medium
Used for voice communications
Digital signal
Discrete waveform
Transmits data coded into two discrete states as 1-bits and 0-bits
Used for data communications
Modem
Translates computer’s digital signals into analog and vice versa
Local Area Networks
Require their own dedicated channels
Encompass a limited distance
Gateway, router, Network Operating System (NOS), peer-to-peer
Wireless LANs
Wi-Fi (802.11b) standard: Up to 11 Mbps, low cost, high-speed mobile Internet access, links work groups
Bluetooth standard: Up to 720 Kbps, small personal area networks
Wide Area Networks (WANs)
Span large geographical distance
Consist of variety of cable, satellite, and microwave technologies
Switched lines, dedicated lines