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OMNIScanner User Guide
Twisted Pair Measurements with OMNIScanner
Wiremap
The Wiremap function tests twisted-pair cabling for proper wiring. Your
cabling configuration is checked for shield continuity, opens, shorts, crossed
pairs, split pairs, and reversed pairs. For each pair, Wiremap displays the
length.
The screen displays a graphical representation of the wiring in your cable,
where the near end wiring is shown on the left side, and the far end
wiring on the right side of the screen.
• A reverse video number indicates a split pair
• A straight line between pairs indicates a good pair
• No line between wire pairs indicates an open
• An X between a wire pair indicates a reversed pair
•A ] between wirepairs indicates a short
• The measured length of the pairs 1-2, 3-6, 4-5,
and 7-8 are shown on the left side.
In the example, OMNI
Scanner
displays split pairs on 1 - 2 and 4 - 5 (al-
though they are wired straight through), a reversed pair 3 - 6, an open on
wire 7, and a short on wire 8 to the Shield.
Press ESC to exit the WIREMAP screen.
Length/Delay
The Length/Delay function measures a cable’s length, propagation delay
and skew. OMNI
Scanner
will determine whether the cable is open or
shorted.
The accuracy of the NVP (Nominal Velocity of Propagation) setting deter-
mines the exactness of the Length measurements. The NVP specified by
cable manufacturers is used for all the cables in OMNI
Scanner
’s library.
When creating or editing cables, the NVP value can be customized.
(See
Chapter 4 - Setup: Cables for further information.)
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