1 Computer Network & Communication Pertemuan 3 & 4 Matakuliah: V0062/Pengantar Teknologi Informasi Tahun: 2008.

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Computer Network & CommunicationPertemuan 3 & 4

Matakuliah : V0062/Pengantar Teknologi Informasi

Tahun : 2008

Computer Network History

• The digital basis of Computers– Electrical Signals as discontinues bursts

• The Analog basis of Life– Electrical signals as continuous waves

• Purpose of the modem– Converting digital signals to analog signals & back

» Analog signals are continous waves that transmit information by altering the characteristics of the waves.

» Digital signals are discrete pulses that are either on or off, representing a series of bits (0s and 1s)

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Computer Networks

• The major components of a telecommunications system :

• Hardware• Communications media• Communications network• Communications software• Data communications providers• Communications protocols• Communications applications

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Communication processors

• Communication processors are hardware devices that support data transmission and reception across a telecommunication system, these devices include:

»modems

»multiplexers

»front-end processors

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Communication processors

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Communications channels

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Communications channels

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Computer Network

• Types of computer networks• LAN

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Computer network

• WAN– Value-added networks– Virtual private networks

• Enterprise networking– Multiple LAN’s and multiple WAN’s

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The Future of communications

• What are the characteristics of the next generation of wired & wireless communications?

» Satellite-based system» Beyond 3G to 4G» Photonics : Optical technologies at warp speed» When utilities become communication companies» Software-Defined Radio» A New way to compute : The Grid

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Communication

• Type of Virtual meetings» Teleconferencing» Email» One to many satellite phones» Videophone videoconferencing» Webcam videoconferencing : Video chat on the

Cheap» Workgroup computing or web conferencing» Future conferencing on 3.5G - 4G Mobile phones

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Individual Quiz

• Quiz for SGLC / OFC1. What are the main business reasons, esp for

hotel industry using LANs?

2. What is the difference between LANs and WANs?

3. Describe the 8 basic types of communications media, including their advantages & disadvantages

4. What could be the future of satellite systems? Is 4G possible?

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