4.4 Given a scenario, troubleshoot and resolve common copper cable issues - Paiet/Tech-Journal-for-Everything GitHub Wiki

4.4 Given a scenario, troubleshoot and resolve common copper cable issues

  • Shorts (diagram)
    • All media that carries electric current will be succeptible to electrical short circuiting.
    • This is normally a physical wiring error that prevents connectivity.
  • Opens (diagram)
  • Incorrect termination (mismatched standards) diagram
    • Straight-through
    • Crossover
  • Cross-talk (diagram)
    • Near end
    • Far end
  • EMI/RFI
    • STP (Foil Wrapper)
    • UTP (Twists)
  • Distance limitations
    • 100 meters regardless of category
  • Attenuation/Db loss
  • Bad connector
  • Bad wiring
    • Split pairs - Incorrect termination (diagram)
    • Tx/Rx reverse - Incorrect termination (diagram)
  • Cable placement
    • Flourescent Lamps
      • cable runs should be perpendicular to length of lamp to minimize EMI.
    • HVAC systems
      • used STP or reroute cabling or use additional conduit to shield
    • Microwaves
      • avoid close runs near high power appliances
  • Bad SFP/GBIC - cable or transceiver