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Testing, Repairing and Installing Home telephone Wiring - Connecting the Wires
Connecting the wires
- Using a wire stripping tool, remove about 4 inches of the outside plastic sheath (usually beige or grey) that bundles the wires together. Be careful not to nick insulation or cut the wires beneath the sheath.
- Using a wire stripping tool, remove about 1 inch of the plastic insulation from each of the colored wires to expose the copper as shown here:
Nowadays, it is more common to see 4-twisted pair wiring like this:
It is called “Cat 5” cable and is the national standard for all new telephone wiring projects.
- Fasten the jack casing securely to the wall or baseboard using the appropriate metal or wood screws. Pull the wire through the opening in the jack casing and connect it as depicted below:
4-Pair Wire Connection: A 4-pair cable is wired to a standard jack as shown in the 3-pair wire diagram above but also leaving the brown wires aside.
- Match each colored wire to the appropriate terminal on the jacks as shown in the diagrams, also see Table B for the Wire Connection and Coding Chart. In the old standard color scheme the first pair has one green wire ("tip")
and one red wire ("ring"). The second pair has one black wire ("tip")
and one yellow wire ("ring"). For a single phone line, only the green and red
pair is normally used. The black and yellow pair is normally spare and available to
install a second phone line. See multi-line installations if needed.
- Ensure that no copper wire is touching any exposed metal inside the jack or electrical box.
- Ensure that all connections are secure.
- Place the jack cover over the casing and either snap or screw it into place.
At the Demarcation Point:
- Strip the wire sheath and colored wires the same way you did for the jacks.
- Connect the wires that come from each jack location to the entry wiring at the demarcation point. Be sure to match the colors correctly.
Also see TABLE B for the Wire Connection and Coding Chart
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