The Physical Medium

  • Chris Carthern
  • William Wilson
  • Richard Bedwell
  • Noel Rivera

Abstract

Have you ever troubleshot a network issue for hours, racking your brain, only to find out that someone pulled a cable slightly out of the port? This chapter focuses on problems at layer 1—the physical layer—and how this layer is overlooked when network problems are experienced. A common example is a cable with a loose connection when troubleshooting another issue. I once left a network down for two days before actually looking at the port to determine the issue, which was a cable with a loose connection. It is very easy for you to blame your commercial carrier, but before you do so, you should exhaust all fault possibilities. This chapter discusses the importance of the physical medium in network design. Topics begin with the physical medium, including transmission media such as copper, coaxial cable, fiber optic cable, and the standards associated with each. Next, the Ethernet, duplex communication systems, autonegotation, Unidirectional Link Detection (UDLD), and common issues associated with layer 1 are covered.

Keywords

Coaxial Cable Network Device Fiber Optic Cable American National Standard Institute European Telecommunication Standard Institute 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Chris Carthern, William Wilson, Richard Bedwell, and Noel Rivera 2015

Authors and Affiliations

  • Chris Carthern
    • 1
  • William Wilson
    • 1
  • Richard Bedwell
    • 1
  • Noel Rivera
    • 1
  1. 1.AEUSA

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