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A telephone cable typically has 4 wires - so two pairs : green (T) + red (R), and black(T) + yellow (R). A 'telephone line' requires 1 pair. Green and Red form pair 1 so the red and green wire will be your telephone line.
A telephone cable typically has 4 wires - so two pairs : green (T) + red (R), and black(T) + yellow (R). A 'telephone line' requires 1 pair. Green and Red form pair 1 so the red and green wire will be your telephone line. In modular connectors, this pair is connected in the middle of the plug /jack (i.e. pins 4-5 in an RJ45 outlet, e.g. in your patch pannel, or pins 2 and 3 in a 4 pin modular connector. You can plug an RJ11 plug into an RJ45 jack (outlet)). Green + Red therefore correspond to the blue pair in an 4 pair UTP cable.
