Telephone Jack Wiring
| Position | Pair | Tip/Ring | Polarity | RJ11 | RJ14 | RJ25 | Solid Color | UTP Color |
|---|---|---|---|---|---|---|---|---|
| 1 | 3 | Tip | + | R3 | White |  | ||
| 2 | 2 | Tip | + | T2 | T2 | Black |  | |
| 3 | 1 | Ring | - | R1 | R1 | R1 | Red |  |
| 4 | 1 | Tip | + | T1 | T1 | T1 | Green |  |
| 5 | 2 | Ring | - | R2 | R2 | Yellow |  | |
| 6 | 3 | Ring | - | T3 | Blue |  |
RJ11, RJ14, RJ25 and RJ12 all use the same physical 6 position connector.
| T3 | |
| R3 | |
| T2 | | | R2 | |
| R1 | | | T1 |
Telephone Jack (RJ11)
The primary/main line is T1/R1. Lines T2/R2 and T3/R3 are usually not used.
Notes:
- Telecom equipment is Positive Ground: tip is 0 volt with respect to ground (earth), ring is negative: -50 volts.
- Nortel M2600 (Aries) series phones are polarity sensitive, the tip (green) is positive relative to ring (red).
- Nortel M3900 (Taurus) series phones are not polarity sensitive, so the wiring polarity does not matter.