Fluke CableAnalyzer DSX-5000, Technical Reference Handbook, Page: 163 / 700

Chapter 3: Certify Twisted Pair Cabling
Frequency-Domain Results
127
PS ACR-N (Power Sum Attenuation to
Crosstalk Ratio, Near End)
PS ACR-N values show 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 wire
pairs. PS ACR-N is the difference (in dB) between PS NEXT and
attenuation (insertion loss). The tester uses the PS NEXT and
attenuation results to calculate PS ACR-N values. Higher PS ACR-N
values mean received signals are much larger than the crosstalk
from all the other wire pairs. Higher PS ACR-N values correspond
to better cabling performance.
PS ACR-N 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 PS NEXT and attenuation
values to calculate PS ACR-N values.
PS ACR-N results are typically a few dB lower (worse) than worst-
case ACR-N results. Figure 56 shows the PS ACR-N plot. The tester
puts the cursor at the worst margin.
Note
If the PS ACR-N result is an
an ,
the 4 dB rule
applies. See “About dB Rules” on page 150.