CS101.Lect07.Networking.ppt

CS101.Lect07.Networking.ppt - CS101 Lecture 07: Networking...

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Computer Science CS101 Lecture 07: Networking Circuit Switching Packet Switching Aaron Stevens ([email protected]) 22 September 2011 Computer Science What You’ll Learn Today What is a communications network? What are the implications of the network topology and transmission strategy? How do computers connect to each other? What are the building blocks of the Internet? How is data transferred across a network? How does my computer connect to the Internet?
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Computer Science Communications Networks What is a network? What are its defining characteristics? Computer Science The Telephone Network POTS (the plain old telephone system), a.k.a PSTN To connect a phone call, the caller’s phone must be physically connected to connect to the receiver’s phone. Connecting these circuits (called switching) takes place at dedicated facilities called central offices.
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POTS Circuit Switching Telephone wires leave your house, and connect to the central office. At the central office, connections are made to other telephone lines… Image from www.exegesis.uklinux. net. Computer Science POTS Circuit Switching Telephone operators used to actually switch wires to connect the calls. In the PSTN, this connection (called switching) is done electronically.
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This note was uploaded on 12/16/2011 for the course CS 101 taught by Professor Stevens during the Fall '08 term at BU.

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CS101.Lect07.Networking.ppt - CS101 Lecture 07: Networking...

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