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ACR-N (Attenuation to Crosstalk Ratio at the
Near End)
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-
17. The tester calculates ACR-N as the difference (in dB)
between NEXT and attenuation (insertion loss). Higher
Near-end
signal
source
Crosstalk and
signal received
from far end
Crosstalk - Received Signal = ACR-N
Note
Figure 3-17. Attenuation to Crosstalk Ratio, Near End (ACR-N)
ACR-N values mean received signals are much larger than
crosstalk signals. Higher ACR-N values correspond to better
cabling performance.
Figure 3-18 describes the ACR-N plot.
The 4 dB rule may apply to your ACR-N results. See
page 3-13.
Crosstalk
Certifying Twisted Pair Cabling
Twisted Pair Autotest Results
Note
3
Far-end
signal
source
AMD91F.EPS
3-25
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