Multi LAN 350
Operation
31
PSNEXT plot screen
5.3.3 NEXT, Remote NEXT
NEXT (near end crosstalk) defines the coupling between adjacent pairs. High level
signals transmitted in one pair on a cable end can induce a substantial disturbance
signal in the neighbouring pairs, on the same (transmitter) side. This signal added to the
signals transmitted from the other cable can cause data corruption, retransmittions and
other problems. The most common causes for NEXT problems are poor twisting on
connector points, non matched connection components, split pairs etc.
The main result is given as the worst case margin in dB 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 NEXT test. After the main unit is connected with the Remote unit and
the test is finished, the NEXT results 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 NEXT Plot screen
WORST:
select worst case result screen
MARGINS:
select margin result screen
NEXT margin result screen
