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Tacettin İKİZ



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Cable Crosstalk Calculation Formulas NEXT FEXT

Started by Tacettin İKİZ, March 07, 2025, 10:42:40 PM

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Tacettin İKİZ

March 07, 2025, 10:42:40 PM Last Edit: March 07, 2025, 10:48:48 PM by Tacettin İKİZ
Cable Crosstalk Calculation Formulas


1.1 Near End Crosstalk (NEXT)



Code Select
NEXT = 10 × log₁₀(P₁ₙ / P₂ₙ) (dB)
where
  • P₁ₙ = input power into the disturbing pair 
  • P₂ₙ = output power of the disturbed pair at near end 
  • NEXT = near end crosstalk 

1.2 Far End Crosstalk (FEXT)



Code Select
I.O.FEXT = 10 × log₁₀(P₁ₙ / P₂𝑓) (dB)
where
  • P₁ₙ = input power into the disturbing pair at the near end 
  • P₂𝑓 = output power of the disturbed pair at far end 
  • I.O.FEXT = far end crosstalk 

1.2.2 Equal Level Far End Crosstalk (EL-FEXT)

Code Select
EL-FEXT = 10 × log₁₀(P₁𝑓 / P₂𝑓) (dB)
where
  • P₁𝑓 = output power of the disturbing pair at the far end 
  • P₂𝑓 = output power of the disturbed pair at far end 
  • EL-FEXT = I.O.FEXT - α·L 
  • α·L = measured attenuation of the disturbing pair of the CUT 
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