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CHAPTER 5: Measurements
Press (Pairs) to view Attenuation/NEXT graphs for other pair
combinations.
Press ESC to exit the ACR screen.
5.3.8 R
ESISTANCE
Resistance is measured in a loop through each pair in the cable. In a twisted-pair
cable, Resistance is measured by using OMNIRemote 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.
5.3.9 P
OWER
S
UM
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, OMNIScanner 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
(Gigabit Ethernet, for example).
In the POWER SUM NEXT screen, the worst case margin for all near and far
pairs is shown at the top of the screen.