Certifying Twisted Pair Cabling
Twisted Pair Autotest Results
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PSNEXT (Power Sum Near End Crosstalk) Test
PSNEXT results show how much each cable pair is affected
by the combined crosstalk from the other pairs. PSNEXT is
the difference (in dB) between the test signal and the
crosstalk from the other pairs received at the same end of
the cabling. The tester uses the NEXT values to calculate
PSNEXT. Higher PSNEXT values correspond to better cabling
performance.
PSNEXT results are typically a few dB lower (worse) than
worst-case NEXT results.
PSACR (Power Sum Attenuation to Crosstalk
Ratio) Test
PSACR values indicate how the amplitude of signals
received from a far-end transmitter compares to the
combined amplitudes of crosstalk produced by near-end
transmissions on the other cable pairs. PSACR is the
difference (in dB) between PSNEXT and attenuation
(insertion loss). The tester uses the PSNEXT and attenuation
results to calculate PSACR values. Higher PSACR values
mean received signals are much larger than the crosstalk
from all the other cable pairs. Higher PSACR values
correspond to better cabling performance.
PSACR is the difference (in dB) between each wire pair’s
attenuation (insertion loss) and the combined crosstalk
received from the other pairs. The tester uses the PSNEXT
and attenuation values to calculate PSACR values.
PSACR results are typically a few dB lower (worse) than
worst-case ACR results.
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