Transcript Data Communications & Computer Networks 0602-341

What is Data Communications
• Communications
– Sharing information
• Telecommunications
– Sharing information across a distance
• Data Communications
– Sharing facts, concepts in whatever form using
data
ICSA 341- Updated 12/2001
Five Components of a Communications Systems
PROTOCOL
PROTOCOL
MESSAGE
MEDIUM
RECEIVER
SENDER
ICSA 341- Updated 12/2001
Evolution of Network technology
• Centralised Processing
• Distributed Processing
ICSA 341- Updated 12/2001
Growing Technology- heterogeneity
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Architecture
Timing
Transfer Rates
# of bits transferable at a time
Internal protocols
ICSA 341- Updated 12/2001
MANAGER's DILEMMA
Best combination of systems & resources,
Cost-wise, feature-wise
How to manage and coordinate them?
ICSA 341- Updated 12/2001
Standards?
• Types:
– De jure
– De facto
ICSA 341- Updated 12/2001