DOI: 10.1109/isscc.1982.1156333
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Abstract: Bell La bora tories Reading, PAA TRANSFORMERLESS TRUNK and subscriber line interface for both voice and 56Kb data transmission will be described. The interface has been fabricated using Complementary Bipolar ICs (CBIC)' on a single thin-film Hybrid Integrated Circuit (HIC). This HIC includes all the active and precision components that are required to provide a programmable battery feed having lightning protection, battery-reversal signaling, 2-wire to 4-wire conversion, switch-hook detection, and power-down …

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