Lecture2 - ARPANET ECE-CSE 861: Introduction to Computer...

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1 ECE-CSE 861: Introduction to Computer Communication Networks Ness B. Shroff ECE & CSE Lecture 2 ARPANET Packet Switched Network Concept of store and forward results in more efficient link utilization Why? Statistical multiplexing possible versus reservation (e.g., FDM or TDM type of multiplexing) Tremendous success -- network has grown exponentially. 500 hosts in 1983 5 Million in 1995 20 Million in 1997 170 Million in 2003 450 Million in 200 Current: 700M+ hosts & 2B users Internet Growth Years it took to reach 50 Million users Radio: 38 years Television: 13 years Internet (post Web): 4 years Switching Two main types of Telecommunication Networks Circuit Switched Networks (Ubiquitous tel. Networks) Packet Switched Networks (Computer Communication Networks) M x N Switch Fabric M Inputs N Outputs Generic Switching Element
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2 A wants to communicate with B Connection is established from A to B via the switching offices Connection is dedicated throughout the call duration
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Lecture2 - ARPANET ECE-CSE 861: Introduction to Computer...

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