MANUAL TEST FUNCTIONS
48
It is important to note that depending on the length of the cable and the type of cable, this test
will have varying results. It is intended only as a guide, and if the test does not result in
definitive results, the user can always simply look at the pair combinations within the cable
itself to determine proper pair combinations. Note: the plug shows the balanced pairs of 1:2,
3:6, 4:5 and 7:8.
It is also important to note that flat cables will have some interesting results. For example a 4
conductor flat cable will have strong coupling between all the pairs that are adjacent to each
other in the cable. For example: 1:2, 2:3, 3:4 will all have strong responses. The standard for flat
cable is that the center pair is the main pair and the outer pair is the secondary, therefore the
correct cable pairing for this situation is 2:3 and 1:4, and must be manually implemented.
In the example below, a six conductor flat cable is analyzed. In this case, adjacent conductors
always couple with each other as indicated by the test. However, the actual standard pairs are
defined from the inside out as 4:5, 3:6, and 2:7.
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
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