. The Bell System technical journal . h is closely allied with the first and second, is the limita-tion of crosstalk coupling between the various telephone circuits on thesame line.) Within an inductive exposure, slightly different voltages may beinduced on or along the two wires of a telephone circuit as pointed outpreviously. By transposing the wires frequently, they can both beexposed to the power system more or less equally and the voltagesinduced in them will tend to be equalized. The difference and hencethe noise-metallic due to direct metallic-circuit induction thus isreduced. This is i
. The Bell System technical journal . h is closely allied with the first and second, is the limita-tion of crosstalk coupling between the various telephone circuits on thesame line.) Within an inductive exposure, slightly different voltages may beinduced on or along the two wires of a telephone circuit as pointed outpreviously. By transposing the wires frequently, they can both beexposed to the power system more or less equally and the voltagesinduced in them will tend to be equalized. The difference and hencethe noise-metallic due to direct metallic-circuit induction thus isreduced. This is illustrated in Fig. 6. If the induction on the twosides of a transposition is identical in magnitude and phase, completeneutralization can be secured. In actual cases, however, these vol-tages are not identical in magnitude and phase because of irregularitiesin the exposure, irregularities in pole spacing, etc., and because of thephase shift and attenuation which were discussed in connection withpower system transpositions. POWER LINE.
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