Site home page
(news and notices)

Get alerts when Linktionary is updated

Book updates and addendums

Get info about the Encyclopedia of Networking and Telecommunicatons, 3rd edition (2001)

Download the electronic version of the Encyclopedia of Networking, 2nd edition (1996). It's free!

Contribute to this site

Electronic licensing info




Related Entries    Web Links    New/Updated Information

Search Linktionary (powered by FreeFind)

Note: Many topics at this site are reduced versions of the text in "The Encyclopedia of Networking and Telecommunications." Search results will not be as extensive as a search of the book's CD-ROM.

An analog signal is a form of propagated energy, such as a sound wave, that vibrates the medium it travels through. Sound waves are measured by their frequency in cycles per second, or hertz (Hz). Digital signals are transmitted over media by representing the binary digits as electrical pulses in which each pulse is a signal element. The voltage of the line is varied between a high state and a low state. For example, a binary 1 may be transmitted by applying a high voltage and binary 0 may be transmitted by applying a low voltage. Bandwidth is a term that refers to the number of bits per second that can be transmitted over a link.

This topic continues in "The Encyclopedia of Networking and Telecommunications" with a discussion of the following:

  • Analog and digital signals
  • Electrical and optical signaling
  • Signal degradations
  • Signal encoding schemes, including:
  • Unipolar
  • Bipolar
  • RZ (return to zero)
  • NRZI (nonreturn to zero, invert on ones)
  • Manchester

Copyright (c) 2001 Tom Sheldon and Big Sur Multimedia.
All rights reserved under Pan American and International copyright conventions.