OMNIScanner User Guide
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Press (Pairs) to view ELFEXT graphs for other pair combinations.
Press ESC to exit the ELFEXT screen.
ACR/Bandwidth
Attenuation to Crosstalk Ratio (ACR) is an indication of how much larger
the received signal is compared to the Near End Crosstalk (NEXT) on the
same pair. ACR is calculated from the measured NEXT and Attenuation. The
ACR value is computed at each measured Attenuation frequency. The worst
case ACR is reported for each pair combination.
Bandwidth is a measure of the usable frequency range of the link under test.
For most networks, this is the highest frequency at which the signal can
easily be distinguished from background noise. Bandwidth is reported as the
frequency where ACR is 3dB.
In the ACR screen the Bandwidth is displayed at the top of the screen.
The pair combinations are located in the column on
the left side, followed by the measured ACR, the
ACR margin/limit, and the frequency. The result for
each pair combination is tagged with a PASS or
FAIL indicator.
Press or to toggle between ACR
results for OMNI
Scanner
and OMNI
Remote
.
Press (Graph) to view the graph for the currently highlighted pair
combination. The values for Attenuation and NEXT are shown at the top of
the screen. Attenuation and NEXT graphs are
displayed for the frequency indicated by the cursor
position.
Press (Pairs) to view Attenuation/NEXT
graphs for other pair combinations.
Press ESC to exit the ACR screen.
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