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฀ Discovering฀Cabling฀Characteristics฀฀ ฀
39฀
G
Termination฀for฀the฀pair:฀
• W R:฀Wiremap฀adapter฀or฀remote฀ID฀locator,฀with฀its฀
number.฀
•
O:฀Open฀
• N:฀Short฀
• Q:฀Port,฀such฀as฀a฀hub,฀switch,฀or฀PC.฀
• E:฀Bridge฀tap.฀
• V:฀Voltage฀is฀detected.฀This฀may฀indicate฀an฀active฀
telephone฀circuit,฀ISDN฀line,฀or฀Power฀over฀Ethernet฀
(PoE)฀device.฀See฀page฀6.
• U:฀The฀tester฀is฀connected฀to฀an฀active฀telephone฀
circuit.฀
•
T:฀A฀signal฀is฀present฀on฀the฀pair.฀
•
?:฀The฀tester฀cannot฀identify฀the฀termination.฀
฀
฀
avv49.bmp฀
Bridge฀tap฀detected฀at฀about฀33.7฀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).฀
-continued-฀
Figure฀15.฀Discover฀Mode฀Results฀for฀Twisted฀Pair฀Cabling฀(cont.)฀