Dial restoral method and apparatus
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United States of America Patent
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Aug 22, 1995
Grant Date -
N/A
app pub date -
Aug 12, 1991
filing date -
Aug 12, 1991
priority date (Note) -
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Abstract
In a multidrop data communication system operating at a first bit rate using the High-Level Data Link Control (HDLC) protocol, dial restoral of communications with a particular tributary at a second, lower bit rate is accomplished without requiring the system as a whole to back down to that lower bit rate. Specifically, the outgoing data is buffered in the dial restoral modem, which discards the data stored in the buffer upon receipt of the HDLC frame which follows any frame in which the so-called 'poll' bit is set.
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