BDC4e Chapter 6 - Chapter 6: Data Transmission Business...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 6: Data Transmission Business Data Communications, 4e
Background image of page 1

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

View Full DocumentRight Arrow Icon
Electromagnetic Signals Function of time Analog (varies smoothly over time) Digital (constant level over time, followed by a change to another level) Function of frequency (more important) Spectrum (range of frequencies) Bandwidth (width of the spectrum)
Background image of page 2
Periodic Signal Characteristics Amplitude (A): signal value, measured in volts Frequency ( f ): repetition rate, cycles per second or Hertz Period (T): amount of time it takes for one repetition, T=1/ f Phase ( φ ): relative position in time, measured in degrees
Background image of page 3

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

View Full DocumentRight Arrow Icon
Bandwidth Width of the spectrum of frequencies that can be transmitted if spectrum=300 to 3400Hz, bandwidth=3100Hz Greater bandwidth leads to greater costs Limited bandwidth leads to distortion
Background image of page 4
Why Study Analog in a Data Comm Class? Much of our data begins in analog form; must understand it in order to properly convert it Telephone system is primarily analog rather than digital (designed to carry voice signals) Low-cost, ubiquitous transmission medium
Background image of page 5

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

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 20

BDC4e Chapter 6 - Chapter 6: Data Transmission Business...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online