What were the original color codes for Tip, Ring, and Ground wires in telephone equipment?

What were the original color codes for Tip, Ring, and Ground wires in telephone equipment?

• A. Green for Tip, Red for Ring, Yellow for Ground
• B. Yellow for Tip, Red for Ring, Green for Ground
• C. Green for Tip, Blue for Ring, Yellow for Ground
• D. Green for Tip, Red for Ring, Black for Ground

Answer: (D)

Tip and Ring are the two active conductors of a telephone circuit, used for the voice signal in a loop. The original color convention for these two wires was Green for Tip and Red for Ring, making the pair easy to identify. The third conductor, used as a Ground reference in older four-wire configurations, was Black. This combination—Green for Tip, Red for Ring, Black for Ground—reflects the historical telephone standard and is why that option matches the original color coding. Yellow or Blue appear in other cable schemes, but they don’t represent the original telephone colors for Tip, Ring, and Ground.

Tip and Ring are the two active conductors of a telephone circuit, used for the voice signal in a loop. The original color convention for these two wires was Green for Tip and Red for Ring, making the pair easy to identify. The third conductor, used as a Ground reference in older four-wire configurations, was Black. This combination—Green for Tip, Red for Ring, Black for Ground—reflects the historical telephone standard and is why that option matches the original color coding. Yellow or Blue appear in other cable schemes, but they don’t represent the original telephone colors for Tip, Ring, and Ground.