Basic / Channel Link Near End Crosstalk (NEXT) Loss (Pair-to-Pair)

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What is Near End Crosstalk (NEXT)?

Near End Crosstalk can occur in adjacent twisted pair wires when data on one twisted pair is electromagnetically coupled back to an adjacent twisted pair causing interference. Near End Cross Talk (NEXT) varies by category cable type and by frequency.

NEXT Loss Chart for Category Cables

Frequency
(MHz)		 Category 3
(dB)		 Category 4
(dB)
1.00 40.1/39.1 54.7/53.3
4.00 30.7/29.3 45.1/43.3
8.00 25.9/24.3 40.2/38.2
10.00 24.3/22.7 38.6/36.6
16.00 21.0/19.3 35.3/33.1
20.00 --/-- 33.7/31.4
25.00 --/-- --/--
31.25 --/-- --/--
62.50 --/-- --/--
100.00 --/-- --/--
Frequency
(MHz)		 Category 5
(dB)		 Category 6
(dB)
1.00 60.0/60.0 65.0/62.0
4.00 51.8/50.6 63.0/60.5
8.00 47.1/45.6 58.2/55.6
10.00 45.0/44.0 56.6/54.0
16.00 42.3/40.6 53.2/50.6
20.00 40.7/39.0 51.6/49.0
25.00 39.1/37.4 50.0/47.3
31.25 37.6/35.7 48.4/45.7
62.50 32.7/30.6 43.4/40.6
100.00 29.3/27.1 39.9/37.1

Available Cable Testers and Category Cables

CAT 5e Cable

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Cat 6 Cable

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Warning: When using this information to perform electrical work, call a licensed electrician and consult the NEC® for safety. All licensed electricians have passed examinations covering the National Electric Code®, know state and local building codes, and may carry insurance to cover damages.