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Today, data transmission over telephone wires requires installation of costly and bulky hardware in the central office: linedriver, codec and DSP as well as analog filters and transformers add to the plain old telephone system (POTS). This is due to the different demands of voice and data on the system. While voice line interfaces (SLICs) with integrated ringing must handle voltages up to 150 V, data transmission according to the ADSL-Lite standard requires processing of signals up to 550 kHz at harmonic distortions below -60 dB. Integration of both line interfaces into one single chip allows attractive system solutions, and so the goal is to combine the high-voltage and high-frequency demands into one IC (B-SLIC). This is the key device for realizing the compact integrated voice/data (IVD) linecard architecture, containing only four different ICs. Transformers, analog filters and relays are completely avoided.
Date of Conference: 9-9 Feb. 2000