RURAL WIRE AND URBAN WIRE FOR TELEPHONE DISTRIBUTION SYSTEMS,
BELL TELEPHONE LABS INC MURRAY HILL N J
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B Rural Wire consists of six twisted pairs of insulated annealed copper No. 19 AWG 0.036 inch diameter conductors cabled around an insulated .109 inch extra high strength steel support wire. Each conductor is insulated with polyethylene followed by an outer covering of polyvinyl chloride to provide added toughness during installation and to provide color coding for ring, tip and pair identification. The insulated conductors are twisted into pairs of different twist length to keep down crosstalk. The support wire is insulated with polyethylene which provides adequate electrical breakdown strength between conductors and the steel wire. B Urban Wire consists of 16 twisted pairs of polyvinyl chloride insulated No. 24 AWG annealed copper conductors stranded around an insulated extra high strength .109 inch steel support wire. The insulated support wire is the same as is used for rural wire. The conductors have distinctively colored insulation for pair, ring, and tip identification. The colors for the pairs in numerical sequence one to sixteen are obtained by mating blue, green, brown, and slate successively with white, red, black, and yellow. Thus, each pair has a different color combination from any other pair.
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