Multiplex communications – Diagnostic testing – Determination of communication parameters
Reexamination Certificate
2001-01-12
2004-04-13
Hsu, Alpus H. (Department: 2665)
Multiplex communications
Diagnostic testing
Determination of communication parameters
C370S395530, C370S465000
Reexamination Certificate
active
06721282
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to telecommunication apparatus that is adapted to extend voice channel capacity. Additionally, the apparatus terminates, compresses/decompresses, demodulates/re-modulates, and buffers channels containing FAX/DATA, modem signals, or call signaling information.
2. Background Art
Current technology includes access servers that allow the voice channels of up to four PSTN T1 lines to be compressed and multiplexed onto one frame relay gateway while providing termination of FAX/DATA and modem data. The voice compression ratios associated with such units are 8:1 to 13:1 employing international telecommunications union (ITU) standards such as code excited linear prediction (CELP), volume software licensing program (VSLP), and ADP32PCM on all channels associated with a T1 PSTN line. Current technology does not permit processing of mixed mode T1 lines (i.e. the mixing of voice channels, FAX/DATA, and modem signals from the same T1 line).
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Blakely , Sokoloff, Taylor & Zafman LLP
Hsu Alpus H.
Nguyen Toan D.
Telecompression Technologies, Inc.
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