Matakuliah
Tahun
: V0062/Pengantar Teknologi Informasi
: 2008
Computer Network &
Communication
Pertemuan 3 & 4
1
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
Communication processors
5
Communications channels
6
Communications channels
7
Computer Network
• Types of computer networks
• LAN
8
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 / OFC
1. 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