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Chapter 6
Structured cabling testing
62
Illustration 6.9. NEXT, ACR-F (ELFEXT) and Power Sum
The NEXT test determines interfering effects (crosstalk) of a transmitting wire pair on the
adjacent wire pair in the same cable. NEXT is measured on Display handset (DH) and Remote
handset (RH).
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2
3
6
4
5
7
8
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1
3
6
4
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Effect of
Adjacent Pair
FEXT test and NEXT measurement are similar; the only difference is that in FEXT test the
transmissions emanate from Remote handset (RH) and that crosstalk is determined at
Display handset (DH).
NEXT measurements are performed on each cable end and for all wire pair combinations
(pair 1-2 to 3-6 etc.). Thus, a total of 12 measurements is performed.
ACR-F (ELFEXT) measurements take place with the Display handset (DH) and the Remote
handset (RH) on both cable ends and for all possible wire pair 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.
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