Crosstalk

Posted on August 12, 2009. Filed under: CCNA, ICND1 break down | Tags: , , , |


  • Crosstalk is unwanted signals coupled between adjacent wire pairs. Since 1000BASE-T uses all four wire pairs, each pair is affected by crosstalk from the adjacent three pairs. Crosstalk is characterized in reference to the transmitter. At higher transmission frequencies, the crosstalk will increase, result in the destruction of more of the data signal.
  • Near-end crosstalk (NEXT) is crosstalk that appears at the output of a wire pair at the transmitter (near) end of the cable.
  • Far-end crosstalk (FEXT) is a measure of the unwanted signal coupling from a transmitter at the near-end into a neighboring pair measured at the far-end.
  • Equal level far-end crosstalk (ELFEXT) is a measure of the unwanted signal coupling from a transmitter at the near-end into a neighboring pair measured at the far-end relative to the received signal level measured on that same pair.
  • Power sum equal level far-end crosstalk (PSELFEXT) is a computation of the unwanted signal coupling from multiple transmitters at the near-end into a pair measured at the far-end relative to the received signal level on that same pair.

ICND1 and ICND2 break down

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[…] * What is a LAN * Ethernet Types And Standards * The Need For And Operation of CSMA/CD * Ethernet Frame * Ethernet Addressing * Host-to-Host Communication * Ethernet Connectors and Cable Types * Pins And Transmissions * Crosstalk […]

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