Power Sum Next, Power Sum Acr-F (Elfext) - IDEAL Networks LanTEK III Manual

combinations (1-2 to 3-6, 3-6 to 1-2, 1-2 etc.). This results in a total of 12
measurements.
6.10

Power Sum NEXT, Power Sum ACR-F (ELFEXT)

Power Sum-Tests determine the crosstalk effects of three transmitting wire pairs on the
fourth wire pair in the same cable.
When using Power Sum NEXT, four (4) calculations on each cable end and on each wire
pair combination (pairs 1-2, 3-6 and 4-5 to 7-8 etc.) are performed. A total of eight (8)
values is obtained.
NOTE:
The Power Sum NEXT values are usually 2 - 3 dB below the value (= stronger crosstalk)
than with conventional NEXT measurement.
When using Power Sum ACR-F (Power Sum ELFEXT), four (4) calculations on the side of
the Display handset (DH) and on each wire pair combination (pairs 1-2, 3-6 and 4-5 to 7-8
etc.) are performed. A total of eight (8) values is obtained.
LanTEK III
User Manual
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Fig. 77 Effects of 3 Pairs on 1 Pair
Fig. 78 Power Sum NEXT
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