Upload
victor-price
View
217
Download
1
Tags:
Embed Size (px)
Citation preview
1
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)
2
Computer Networks
• The major components of a telecommunications system :
• Hardware• Communications media• Communications network• Communications software• Data communications providers• Communications protocols• Communications applications
3
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
4
Computer network
• WAN– Value-added networks– Virtual private networks
• Enterprise networking– Multiple LAN’s and multiple WAN’s
9
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
10
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
11
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?
12