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CROSSED (i.e. reverse-pair positioning) is when Fibers are installed 1...n on one end, but on the other end, each pair is crossed behind the patch panel. Then the user can connect the patch cables on both ends straight in, while still ensuring transmit goes to receive.

1 ----------------------- 2
2 ----------------------- 1


3 ----------------------- 4
4 ----------------------- 3


5 ----------------------- 6
6 ----------------------- 5