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Appendix A
Attenuation
Measures attenuation of all four pairs.
Frequency Range
Frequency Step Size
Resolution
Dynamic Range
Baseline Accuracy
Return loss
Measures return loss of all four pairs from each end of the cabling run under
test.
Frequency Range
Frequency Step Size
Resolution
Dynamic Range
Baseline Accuracy
Equal level far end crosstalk (ELFEXT)
Measures far end coupling between pairs in the cabling run under test. Measured
for all pair combinations.
Frequency Range
Frequency Step Size
Resolution
Dynamic Range
Baseline Accuracy
Attenuation to crosstalk ratio (ACR)
Computed by subtracting the measured attenuation from the measured near end
crosstalk (NEXT) at each frequency point.
Power sum NEXT (PSNEXT)
Computed for each pair by calculating a power sum total of the pair-to-pair
NEXT from the three other pairs.
Power sum ELFEXT (PSELEXT)
Computed for each pair by calculating a power sum total of the pair-to-pair
ELFEXT from the three other pairs.
1 – 350 MHz
125 kHz, 250 kHz, 500 kHz, 1 MHz , set
automatically based on selected standards
0.1 dB
90 dB
40% better than TIA Level III requirement
1 – 350 MHz
125 kHz, 250 kHz, 500 kHz, 1 MHz , set
automatically based on selected standards
0.1 dB
35 dB
40% better than TIA Level III requirement
1 – 350 MHz
125 kHz, 250 kHz, 500 kHz, 1 MHz , set
automatically based on selected standards
0.1 dB
90 dB or 40 dB beyond Category 6 link limit
whichever is higher
40% better than TIA Level III requirement
1
2
1
2
1
2
Specifications 142
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