Microtest OMNIScanner2 Guide de l'utilisateur Page 67

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OMNIScanner User Guide
compared to the transmitted signal and the difference is reported as the
NEXT value in dB. When measuring the NEXT for the OMNI
Remote
end, the
roles of the two units are reversed. OMNI
Scanner
provides the termination;
OMNI
Remote
transmits and measures the signal.
In the NEXT screen, the worst case margin for all
near and far pair combinations is shown at the top of
the screen.
The pair combinations are displayed in the column on
the left side, followed by the measured NEXT value,
margin/limit, and frequency. The result for each pair
combination is tagged with a PASS , Marginal
PASS , Marginal FAIL , or FAIL indicator.
Press or to toggle between the NEXT results for OMNI
Scan-
ner
and OMNI
Remote
.
Press (Graph) to display the NEXT graph for the highlighted pair
combination. NEXT is displayed for the frequency indicated by the cursor
position.
Press (Pairs) to view NEXT graphs for other
pair combinations.
Press (Diagnostics) to display the TDNXT
screen, where cabling and/or connection faults can
be identified.
(See Chapter 6 - Diagnostics: Using
TDNXT to diagnose a Link for further information.)
Press ESC to exit the NEXT screen.
Attenuation
The Attenuation function measures signal loss in a
cable as a function of frequency. OMNI
Remote
generates and injects a signal at the far end of the
cable. OMNI
Scanner
measures the signal at the
other end of the cable to determine cable loss.
In the ATTENUATION screen, the worst case margin
for all pairs is shown at the top of the screen.
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