Certifying Twisted Pair Cabling
Running Single Tests
3-31
3
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 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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