Multi LAN 350
Operation
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The following actions can now be performed:
ESC key:
return to Attenuation result screen
NEXT PAIR:
view next plot
Left, Right key:
move cursor left and right to view margin and result at selected
frequency
Up, Down key:
move cursor up and down along the amplitude axis.
5.3.8 PSACR, Remote PSACR
PSACR (Attenuation to crosstalk ratio) is a comparison of the attenuated regular signal
and disturbing crosstalk signals from other pairs on the receiver side. PSACR is
computed from Attenuation and PSNEXT.
PSACR(f) = PSNEXT(f) - Attenuation(f)
PSACR results consider Attenuation and PSNEXT. It is taken in account that at shorter
cables the PSNEXT could be higher without degradation of the link performance.
Therefore it is very suitable for the estimation whether the crosstalks are critical or not.
Test procedure:
Make sure that the Remote unit is connected on the far end of the cable.
Select and start the PSACR test. After the Remote unit is connected the test is
completed, all four PSACR results together with 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 PSACR Plot screen
Attenuation plot screen
