Return Loss shows " i " for the result | Fluke Networks

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Return Loss shows " i " for the result

The last OMNIScanner left the factory back in July 2005. We regret to say service and support ended July 2009. It's replaced by the Versiv familly of testers.

The i in the Return Loss field indicated that the results are for Information Only. The reason for this that the Attenuation result is less than 3 dB. Since the Attenuation is less than 3 dB, then Return Loss is ignored. This is specified by the ANSI/TIA-1152 3 dB Rule.

Information Only Return Loss

This rule also applies to ISO/IEC 11801 and EN50173.
In LinkWare you will see: 

LinkWare Not Available Result

 Here are the simple steps for the 3 dB Rule.

  1. Which pair for RL are you looking at?
  2. View the attenuation graph for that pair
  3. Discover at what frequency you have 3 dB of attenuation
  4. Note this frequency
  5. Now go back and have another look at the RL graph for that pair
  6. Any RL measurement less that your noted frequency in step 3) is ignored
For short links, the attenuation never reaches 3 dB, so the entire frequency range is ignored for RL. When this happens, you will see N/A in LinkWare as shown above.

Autor: Fluke Networks

Data de criação: 27-2-2014

Última alteração: 27-2-2014

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