lec1 - ELEN 602 Computer Communications & Networks...

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ELEN 602 Lecture 1 1 Instructor: Narasimha Reddy Contact : reddy@ece.tamu.edu, 845-7598, 333J Wisenbaker Textbook Class notes available: http://www.ece.tamu.edu/~reddy/ee602_10.html Teaching Assistant/Grader : Jasson Casey TA Office Hours : Announced on the web Grading : Homeworks: 30%, Tests: 60%, Project: 10%
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ELEN 602 Lecture 1 2 Some Communication Networks Flying Pigeons Marathon Runners Reflecting Mirrors Telephone Telegraph Cable TV Internet Satellite-based cable/telephone
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ELEN 602 Lecture 1 3 The caller picks up the phone triggering the flow of current in wires that connect to the telephone office. The current is detected and a dial tone is transmitted by the telephone office to indicate that it is ready to receive the destination number. The caller sends this number by pushing the keys on the telephone set. Each key generates a pair of tones that specify a number. (In the older phone sets the user dials a number which in turn generates a corresponding number of pulses.) The equipment in the telephone office then uses the telephone network to attempt a connection. If the destination telephone busy, then a busy tone is returned to the caller. If the destination telephone is idle, then ringing signals are sent to both the originating and destination telephones. The ringing signals are discontinued when the destination
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This document was uploaded on 03/03/2011.

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lec1 - ELEN 602 Computer Communications & Networks...

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