Fluke DTX Series - ACR (Attenuation to Crosstalk Ratio)

DTX Series CableAnalyzer
Technical Reference Handbook
3-22
ACR (Attenuation to Crosstalk Ratio)
ACR is like a signal-to-noise ratio. ACR values indicate
how the amplitude of signals received from a far-end
transmitter compares to the amplitude of crosstalk
produced by near-end transmissions, as shown in Figure
3-16. The tester calculates ACR as the difference (in dB)
between NEXT and attenuation (insertion loss). Higher
ACR values mean received signals are much larger than
crosstalk signals. Higher ACR values correspond to better
cabling performance.
Figure 3-17 describes the ACR plot.
Far-end
signal
source
Crosstalk
Near-end
signal
source
Received signal - crosstalk = ACR
Crosstalk and
signal received
from far end
amd91f.eps
Figure 3-16. Attenuation to Crosstalk Ratio (ACR)