Method and apparatus for multiplexing voice and data on a single analog-loop telephone line
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United States of America Patent
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Nov 25, 1997
Grant Date -
N/A
app pub date -
Mar 22, 1996
filing date -
Jun 24, 1994
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An enhanced micro-controller having multiple operating modes, including an idle mode, an analog voice mode, a digital data mode, and a simultaneous voice and data (SVD) mode, is provided to a DCE designed to support multi-modal voice and/or data calls over a single analog-loop telephone line. The enhanced micro-controller further contains control logic for establishing multiple logical connections and voice as well as data transmission protocols over these logical connections with another DCE, when switching from the analog voice mode to the SVD mode, and for multiplexing voice and data transmissions over these logical connections. During operation, the control logic transmits voice over a logical voice connection in nominally fixed intervals without error control, i.e. re-transmission for reliability. If non-voice transmission, i.e. data or information to be exchanged, is in progress, when it is time to transmit voice, and there are voice to be transmitted, the non-voice transmission is preferably suspended in favor of the voice transmission.
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