Black Box TS560A, User Manual

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59
Split Pair
A split pair is an error in the twisting of the wires within
the cable. The cables are generally made up of eight
wires twisted together in 4 pairs. These 4 pairs are
designated as pairs by the wiring standards and are
intended to carry a signal and its return. 1&2, 3&6, 4&5,
and 7&8 are the pairs designated by T568A/B for an RJ-
45 jack or plug. A cable can be wired with correct
continuity but not with correct pairing. This most often
happens when the cable is terminated consistently at
both ends, but in the wrong order. A dynamic or AC test
is required to detect this type of error.
If the only error is a
split pair error, the cable has correct continuity. If crosstalk is
not a concern, as in flat satin cable, the cable is good.
If a split
pair is detected while testing with a remote, the pin
numbers on the second line of the wire map with split
pairs flash, and an error message lists the pin numbers
of the pairs involved in the error. If a split pair is
detected while testing without a remote, only the error
message is displayed. See Figure 7-5.
CHAPTER 7: Interpreting Cable Test Results