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Though the RJ-11 connector has a total of 6 connector positions, typically either only 2 or 4 are used.RJ-11 connector wiring comes in two standard types. There's (A) Untwisted and (B) Unshielded Twisted Pair. CAT5 connectors (RJ45) have 8 contacts (4 wire pairs); standard telephone jacks (RJ11) have 4 contacts (2 wire pairs). When using Cat5 use the center pair (Blue/Blue-white) in the CAT5 cable. Connect the CAT5 pair to the Red and Green on the standard phone jack.