Which term describes interference at the transmit end of a twisted-pair cable from a transmit pair to an adjacent pair, as measured at the far end?

Which term describes interference at the transmit end of a twisted-pair cable from a transmit pair to an adjacent pair, as measured at the far end?

• A. Crosstalk
• B. FEXT
• C. NEXT
• D. ACR

Answer: (B)

Crosstalk between pairs in a twisted-pair cable comes from the unwanted coupling of one pair into another. When you observe that interference at the far end of the link, caused by the transmitter on one pair affecting an adjacent pair, you’re describing far-end crosstalk. That’s why this term fits the scenario, since the measurement location is the far end rather than at the transmit end. Near-end crosstalk would be measured at the transmitter end, not the far end, and ACR is just a performance ratio, not the type of interference.

Crosstalk between pairs in a twisted-pair cable comes from the unwanted coupling of one pair into another. When you observe that interference at the far end of the link, caused by the transmitter on one pair affecting an adjacent pair, you’re describing far-end crosstalk. That’s why this term fits the scenario, since the measurement location is the far end rather than at the transmit end. Near-end crosstalk would be measured at the transmitter end, not the far end, and ACR is just a performance ratio, not the type of interference.