1 / 6

Long Distance Communications

This article explores long-distance communication methods, focusing on carriers, modems, and signal transmission. It discusses signal loss due to resistance in copper wires, which converts electrical energy into heat. Various modulation techniques are examined, including amplitude modulation (AM), frequency modulation (FM), and phase shift modulation. The significance of continuous oscillating signals and the alteration of carrier signals for binary data transmission is highlighted. Understanding these concepts is crucial for effective communication across vast distances, especially in computer networks.

saber
Télécharger la présentation

Long Distance Communications

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Long Distance Communications Carriers and Modems

  2. Sending Signals Across Long Distances • Signal Loss • Resistance to the electrical signal in copper wire causes small amounts of electrical energy to be converted into heat.

  3. Sending Signals Across Long Distances • Continuous Oscillating Signal • The Carrier • Modifying the Carrier • Amplitude Modulation Reduced to 2/3 for “1” bit. Reduced to 1/3 for “0” bit.

  4. Sending Signals Across Long Distances Frequency Modulation

  5. Sending Signals Across Long Distances • Phase Shift Modulation • Used by computer networks After phase shift the carrier continues to oscillate, but … Carrier abruptly jumps to a new point in the cycle The size of section removed determines the amount of shift. Changes timing of carrier wave abruptly …starts at a new point in the cycle Hardware measures amount of shift to determine the number of bits.

  6. The End.

More Related