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Home USA Telephone Wiring Color Code in 2019 CSRearJackOrangePair-Copyright-440x906-IMG_0361

CSRearJackOrangePair-Copyright-440×906-IMG_0361

The blue pair and orange pair are both connected to the telephone jack.

Here the orange pair is connected as the primary telephone line

The blue pair and orange pair are both connected to the telephone jack.
Placement of 4 pairs on a jack or a plug