Certifying Twisted Pair Cabling
Running Single Tests 3
3-29
PSELFEXT Test
PSELFEXT results show how much the far end of each
cable pair is affected by the combined far-end crosstalk
from the other pairs. PSELFEXT is the difference (in dB)
between the test signal and the crosstalk from the other
pairs received at the far end of the cabling. The tester
uses the ELFEXT values to calculate PSELFEXT. Higher
PSELFEXT values correspond to better cabling
performance.
PSELFEXT results are typically a few dB lower than worst-
case FEXT results.
Running Single Tests
The tester’s single test mode (SINGLE TEST on the rotary
switch) lets you run individual tests for isolating cabling
failures and quickly testing repairs. You can run some
single tests without a remote. Table 3-2 shows which
tests require a smart remote.
Single tests use the selected test limit to produce a
PASS/FAIL result for the test. Each single test also
produces results for other measurements. For example,
the wire map test also produces resistance, propagation
delay, and delay skew results. To see these results, press
I when the single test is finished; then press K View
Results.
To save a single test, press
N, select or create a cable ID;
then press
N again.
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