220-801 · Question #200
Which of the following is the standard sequence of wire color in a RJ-11 phone line?
The correct answer is B. Black, Red, Green, Yellow. The standard USOC (Universal Service Order Code) wiring for a 4-wire RJ-11 connector uses the color sequence Black, Red, Green, Yellow from pin 2 to pin 5 (in a 6-position connector). For a basic single phone line, Red (ring) and Green (tip) are the active pair at the center…
Question
Which of the following is the standard sequence of wire color in a RJ-11 phone line?
Options
- AGreen, Black, Yellow, Red
- BBlack, Red, Green, Yellow
- CYellow, Black, Red, Green
- DRed, Black, Green, Yellow
How the community answered
(35 responses)- A3% (1)
- B94% (33)
- C3% (1)
Explanation
The standard USOC (Universal Service Order Code) wiring for a 4-wire RJ-11 connector uses the color sequence Black, Red, Green, Yellow from pin 2 to pin 5 (in a 6-position connector). For a basic single phone line, Red (ring) and Green (tip) are the active pair at the center positions. The full 4-wire sequence - Black, Red, Green, Yellow - supports two phone lines and is the industry standard recognized by telecommunications and IT certifications.
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