Examples of link error analysis

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The following examples show how experience and good diagnostic judgment can aid in error analysis for a link environment.

  • The failing link uses the same cabling components, has approximately the same length, and attaches the same device types as another link that is currently operational. It is most likely that attenuation, not dispersion, caused the link error.
  • The failing link operates correctly when a substitute device is attached. Again, attenuation is probably the cause of the error.
  • The failing link operates correctly when substitute link components (spare or backup cables) are used. Attenuation is usually the cause of the error.
  • All links with this configuration are failing. If attenuation measurements are within specifications, the length of the link and optical fiber specifications should be checked.
  • The failing link has never been used before. The length of the link and optical fiber specifications should be checked if attenuation measurements are within specifications.
  • The failing link is the only link in this location. If attenuation measurements are within specifications, the length of link and fiber plant specifications should be checked.
  • The failing link was previously used for an entirely different type of system. If a customer determines that the link was optimized for an application employing a wavelength other than 1300 nm, then excessive dispersion could be the cause of the error.