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฀ ฀
฀ Qualifying฀Cabling฀with฀the฀Autotest฀฀ ฀
31฀
avv27.bmp฀ avv33.bmp฀
Bridge฀tap฀detected฀at฀about฀86฀m.฀฀
The฀distance฀to฀a฀bridge฀tap฀is฀approximate฀(
≈)฀because฀
multiple฀reflections฀from฀the฀bridge฀tap฀interfere฀with฀
length฀measurements.฀
Note฀
Bridge฀tap฀detection฀requires฀a฀minimum฀of฀two฀
branches฀(excluding฀the฀branch฀connected฀to฀the฀
tester)฀at฀least฀15฀ft฀(4.6฀m)฀long฀each,฀with฀a฀
combined฀length฀of฀at฀least฀40฀ft฀(12.2฀m).฀
Delay฀skew฀failure฀(1000BASE-T฀only).฀Delay฀skew฀results฀are฀
available฀only฀if฀delay฀skew฀failed.฀
Delay฀skew฀is฀the฀difference฀in฀the฀arrival฀times฀of฀signals฀on฀
the฀cable฀pairs.฀See฀the฀Appendix฀for฀causes฀of฀delay฀skew฀
problems.฀
Note฀
If฀both฀the฀length฀test฀and฀skew฀test฀failed,฀only฀
the฀length฀results฀are฀shown.฀
Figure฀12.฀Length฀Results฀Screens฀(cont.)