Multi LAN 350
Operation
34
ELFEXT plot screen
5.3.5 PSELFEXT, Remote PSELFEXT
PSFEXT (Power Sum Far End Crosstalk) defines crosstalk caused by the coupling of
signals into a cable pair from other pairs. The receiver of crosstalk signals is on one
cable side and the transmitters on the other cable side on another pair. The main result
is given in dB as ate worst case margin to the test standard limit.
PSELFEXT (Power Sum Equivalent Level Far End Crosstalk) is calculated from
PSFEXT and the attenuation on the receiver pair.
High PSELFEXTs cause typical crosstalk problems: data corruption, retransmittions etc.
The main result is given in dB as the worst case margin to the test standard limit.
Test procedure:
Make sure that the Remote unit is connected on the far end of the cable.
Select and run the PSELFEXT test. After the Remote unit is connected and the test is
completed, all nine ELFEXT results and an overall Pass/Fail decision are shown on the
display. The following actions can now be performed:
ESC key:
return to Single Test main screen
TEST:
repeat the test
PLOT:
select PSELFEXT Plot screen
WORST:
select worst case result screen
MARGINS:
select margin result screen
PSELFEXT margin result screen
