Method and apparatus for providing 56K modem technology for public switched telephone networks
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United States of America Patent
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May 8, 2001
Grant Date -
N/A
app pub date -
Jan 21, 1998
filing date -
Jan 22, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
To take advantage of 56K modem technology, a data signal must only traverse one digital to analog (D/A) conversion and one analog to digital (A/D) conversion on the return path to a subscriber. However, current data transmission for subscribers served by a Universal DLC system requires a D/A conversion at a voice switch of a public switched telephone network (PSTN), an A/D conversion at the central office terminal of a PSTN and a D/A conversion at a remote data terminal of a DLC system. This adds a D/A and an A/D conversion which causes 56K modem technology to fail. The present invention provides a telephone call routing apparatus installed between subscribers served by a Universal type digital loop carrier system, a central office terminal of a PSTN and a data network interface. The present invention avoids an additional digital to analog conversion performed at the PSTN voice switch and an additional analog to digital conversion performed at the PSTN central office terminal, thereby enabling 56K modem data transmission.
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