Autotest
Autotest Results for Twisted Pair Cable
3
3-15
NEXT@REMOTE
The NEXT@REMOTE test and its results are identical to the NEXT test described
above, except that the NEXT@REMOTE measurements are taken from the remote
end of the cable.
ELFEXT Test
The ELFEXT (equal level far-end crosstalk) test calculates the ratio of FEXT to
attenuation for each cable pair. To determine ELFEXT, the main unit first
measures FEXT by generating a signal at the far end of the cable and measuring
the resulting crosstalk at the near end of the cable. ELFEXT is calculated as the
difference (in dB) between the measured FEXT and attenuation values. If the
ELFEXT test fails, you can use the F key to locate sources of crosstalk on the
cable.
Because ELFEXT values from either end of a cable are virtually identical, a
ELFEXT@REMOTE test is not required. (See Chapter 7 for more information.)
The first ELFEXT screen displays the cable pairs tested, the worst-case ELFEXT
margin, and the test result for each set of pairs.
To see detailed results for the cable pairs, use D U to highlight the pairs; then
press @ View Result. Table 3-6 describes the items on the ELFEXT
results screen.
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