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Autotest
Autotest on Coaxial Cabling
3
3-23
RL@REMOTE
The RL@REMOTE test is identical to the RL test, except that the RL values are
measured from the remote end of the cabling.
PSNEXT (Power Sum NEXT) and PSNEXT@REMOTE
The PSNEXT results show how much each cable pair is affected by the combined
NEXT from the other pairs. PSNEXT is expressed as the difference in amplitude
(in dB) between the crosstalk received on a cable pair and a test signal transmitted
on the other pairs.
PSNEXT is calculated from NEXT values. PSNEXT@REMOTE is calculated
from NEXT@REMOTE values. The descriptions of the results are the same as for
NEXT results, except that they show the sum effect of NEXT on a cable pair.
PSELFEXT (Power Sum ELFEXT)
The PSELFEXT results show how much each cable pair is affected by the
combined FEXT from the other pairs. To calculate PSELFEXT for a cable pair,
the test tool subtracts the pairs attenuation from the combined FEXT of the other
pairs. The descriptions of the results are the same as for ELFEXT results, except
that they show the sum effect of FEXT on a cable pair.
PSACR (Power Sum ACR) and PSACR@REMOTE
PSACR results show the ratio of each wire pairs attenuation to the combined
crosstalk received from the other pairs. The test tool calculates PSACR values by
subtracting a pairs attenuation from its PSNEXT value. PSACR@REMOTE
values are calculated using PSNEXT@REMOTE values.
Autotest on Coaxial Cabling
To run an Autotest on coaxial cabling, refer to Figure 3-10 and proceed as follows:
89


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