Fluke DTX-1200 - ACR-N (Attenuation to Crosstalk Ratio at the Near End)

DTX Series CableAnalyzer
Technical Reference Handbook
3-24
ACR-N (Attenuation to Crosstalk Ratio at the
Near End)
Note
ACR-N is also known as ACR.
ACR-N is like a signal-to-noise ratio. ACR-N 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-
18. The tester calculates ACR-N as the difference (in dB)
between NEXT and attenuation (insertion loss). Higher
ACR-N values mean received signals are much larger than
crosstalk signals. Higher ACR-N values correspond to better
cabling performance.
Figure 3-19 describes the ACR-N plot.
Note
The 4 dB rule may apply to your ACR-N results. See
page 3-13.
amd91f.eps
Figure 3-18. Attenuation to Crosstalk Ratio, Near End (ACR-N)
Far-end
signal
source
Crosstalk
Near-end
signal
source
Crosstalk - Received Signal = ACR-N
Crosstalk and
signal received
from far end