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Appendix C
Measurement Methods and Limits
C-7
ACR
Attenuation-to-Crosstalk Ratio is the difference between results of Attenuation
and NEXT. ACR (worst pair-to-pair).
ANSI/TIA/EIA
Frequency
(MHz/dB)
Permanent Channel Permanent Channel Permanent Channel Permanent Channel
1.00 36.90 34.90 59.20 57.80 57.90 57.80 71.50 70.50
4.00 24.60 22.00 47.80 46.10 50.80 49.10 60.40 59.10
8.00 17.10 14.10 41.40 39.30 44.30 42.30 54.20 52.50
10.00 14.30 11.20 39.20 37.00 42.20 39.90 52.10 50.30
16.00 7.80 4.40 34.10 31.40 37.00 34.50 47.30 45.20
20.00 31.50 28.70 34.50 31.80 44.80 42.70
25.00 28.80 26.00 31.80 29.00 42.30 40.00
31.25 26.10 22.90 29.10 25.90 39.60 37.10
62.50 16.00 12.10 19.00 15.10 30.20 27.10
100.00 7.70 3.10 10.70 6.10 22.60 19.00
155.52 14.30 10.00
250.00 3.50 -
Category 3 Category 5 Category 5e Category 6 (Draft 9)
ANSI/TIA/EIA568/TSB67/95
ANSI/TIA/EIA568
ANSI/TIA/EIA568/TSB67
ANSI/TIA/EIA568/TSB67/95
ISO/AS/NZS
Frequency
(MHz/dB)
Permanent Channel Permanent Channel Permanent Channel Permanent Channel
1.00 37.00 34.90 51.50 51.30 59.30 58.10 70.80 70.40
4.00 24.90 22.00 40.20 39.80 48.00 46.20 59.50 58.90
8.00 17.00 13.80 34.10 33.90 41.30 38.90 53.20 52.30
10.00 14.70 11.20 31.50 30.90 39.40 37.00 51.00 50.00
16.00 8.40 4.40 26.60 25.90 34.60 31.70 46.10 44.90
20.00 24.50 23.70 32.00 29.00 43.70 42.30
25.00 21.90 21.10 28.80 25.60 41.10 39.60
31.25 18.90 17.90 26.60 23.10 38.40 36.70
62.50 8.60 7.20 16.80 12.30 29.00 26.50
100.00 4.00 4.00 8.70 3.50 21.40 18.20
155.52 13.10 9.00
250.00 2.40 -
ISO Class-D
ISO Class-D 11801 Proposed
ISO Class-C AS/NZS 3080 ISO Class-E