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DIY Home Telephone Wiring
It's also assumed that you have at least a rudimentary understanding of electrical safety. Also, for everybody, it's a bad idea to work on your phone wiring during thunderstorms. As long as you use the same colors on both ends, it doesn't matter. In practice, you'll probably want to install a second wiring block beside the first, and use a short piece of four-strand wire to extend the system from the existing block to the new one. Repairpersons have sometimes remedied this by running the one phone line across the black and yellow wires rather than replacing the cabling. I have an internet line fully joined with router and computer. Phone Line Polarity Tester.