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OMNIScanner User Guide
Resistance
Resistance is measured in a loop through each pair in the cable. In a
twisted pair cable, Resistance is measured by using OMNI
Remote
to short
the far end of the pair under test.
The RESISTANCE screen displays the Resistance
Limit and the test results in Ohms for each pair. The
result for each pair is tagged with a PASS or FAIL
indicator.
Press ESC to exit the RESISTANCE screen.
Power Sum NEXT
Like NEXT, Power Sum NEXT is a measurement of electromagnetic
coupling between adjacent pairs. While NEXT reports test results for each
pair combination, Power Sum NEXT is calculated from NEXT for individual
pair combinations and takes into account the crosstalk from multiple
transmission pairs. When reporting Power Sum NEXT, OMNI
Scanner
displays results for pairs, rather than pair combinations. The PS NEXT
measurement is required to assure proper operation of networks employing
simultaneous transmission on more than one pair in a link (i.e. Gigabit
Ethernet).
In the POWER SUM NEXT screen, the worst case
margin for all near and far pairs is shown at the top of
the screen.
The pairs are displayed in the column on the left
side, followed by the PSNEXT in decibels (dB), the
margin/limit, and the frequency. The result for each
pair is tagged with a PASS , Marginal PASS ,
Marginal FAIL , or FAIL indicator.
Press or to toggle between the
PSNEXT results for OMNI-
Scanner
and OMNI
Remote
.
Press (Graph) to display the PSNEXT graph for
the currently highlighted pair. PSNEXT is displayed for
the frequency indicated by the cursor position.
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