Part_4_Data_Transmission

# Part_4_Data_Transmission - Basic Concepts in Data...

This preview shows pages 1–12. Sign up to view the full content.

EE450, USC, Zahid 1 Basic Concepts in Data Transmission EE450: Introduction to Computer Networks Professor A. Zahid

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
EE450, USC, Zahid 2 Data and Signals z Data is an entity that convey information z Analog Continuous values within some interval e.g. sound, video z Digital Discrete values e.g. text, integers z Signals are electrical or electromagnetic or optical representations of data
EE450, USC, Zahid 3 Analog vs.Digital Signals

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
EE450, USC, Zahid 4 Periodic Signals “Pattern repeated over time”
EE450, USC, Zahid 5 Parameters of a Sinusoid z Peak Amplitude (A) z Maximum strength of signal z Measured in volts or amps z Frequency (f) z Rate of change of signal z Measured in Hertz (Hz) or cycles per second z The Period of a periodic signal, T = 1/f z Phase ( φ ) z Relative position in time z Measured in Degrees (or Radians)

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
EE450, USC, Zahid 6 Varying Sine waves s(t)= A sin(2 π f t+ φ )
EE450, USC, Zahid 7 Frequency Domain Concepts z Any arbitrary signal can be thought as a combination of many (may be infinite) components with each component being a sinusoidal waveform of given amplitude, frequency and phase z Example shows the addition of two sinusoids

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
EE450, USC, Zahid 8 Time vs. Frequency Domains t(sec) x(t) 1 -X/2 0 X/2
EE450, USC, Zahid 9 Spectrum and Bandwidth z Spectrum of the Signal z range of frequencies contained in signal z Bandwidth of the Signal z width of spectrum z Telephony (Voice) bandwidth 300Hz~ 3400Hz z Video bandwidth 4~6 MHz z Bandwidth of Transmission System z Range of frequencies that will pass through the system without much degradation

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
EE450, USC, Zahid 10 Analog Signals representing Analog/Digital Data
EE450, USC, Zahid 11 Digital Signals representing Analog/Digital Data

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 12/29/2009 for the course EE 450 at USC.

### Page1 / 32

Part_4_Data_Transmission - Basic Concepts in Data...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online