Fluke OMNIFiber, User Manual

Page: 77 / 136

OMNIS
CANNER
User Guide
5 - 10
indicated by the cursor position.
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 fre-
quency. The result for each pair combination is tagged with a PASS
or FAIL indicator.
Press or to toggle between ACR results for OMNIS
CANNER
and OMNIR
EMOTE
.
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