tip and ring
tip and ring Pair of wires that provide the electrical connection between a telephone set and the local CO. The more electrically positive side of a POTS (Plain Old Telephone Service) telephone line (0 V) is the tip. It is designated internationally as black, but in the U.S. it often is designated green. It’s counterpart is the ring (the more negative side, 52 v), which is designated red internationally and in the U.S. When tip and ring are terminated on a connecting block, tip usually goes on top (left) and ring usually goes on the bottom (right).
Source: ftp://espectrocrom.com/pub/manuales/cisco/pdfs/Cisco-Dictionary-Of-Internetworking-Terms-And-Acronyms.pdf
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