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Kapitel 6
Verkabelungstest an strukturierter Verkabelung
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NEXT, ACR-F (ELFEXT) und Power Sum
Mit den Tests NEXT (Nahnebensprechen) und ACR-F (ELFEXT) wird das Nebensprechen am
nahen und fernen Ende des Kabels in einem Autotest gemessen. Hohe Nebensprechpegel
können zu häufige Wiederholungen, eine Beschädigung der Daten und andere Störungen
hervorrufen, die die Übertragungsrate beeinträchtigen.
Abbildung 6.1. NEXT, ACR-F (ELFEXT)
Der NEXT-Test ermittelt die störenden Auswirkungen (Nebensprechen) eines sendenden
Adernpaares auf das benachbarte Adernpaar im gleichen Kabel. NEXT wird am Display-
Handgerät (DH) und am Endgerät (RH) gemessen.
Der FEXT-Test ähnelt der NEXT-Messung, nur dass hier die Übertragungen vom Endgerät
(RH) ausgehen und das Nebensprechen am Display-Handgerät (DH) ermittelt wird.
Die NEXT-Messungen erfolgen an jedem Kabelende und für alle Adernpaar-Kombinationen
(Paar 1-2 zu 3-6 usw.). Insgesamt werden also 12 Messungen ausgeführt.
Die ACR-F (ELFEXT) Messungen erfolgen mit dem Display-Handgerät (DH) und dem Endgerät
(RH) an beiden Kabelenden und für alle möglichen Adernpaar-Kombinationen (1-2 zu 3-6,
3-6 zu 1-2, 1-2 usw.). Hier ergeben sich daher insgesamt 24 Messungen.
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