Open loop desynchronizer
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United States of America Patent
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Mar 5, 1996
Grant Date -
N/A
app pub date -
Jul 1, 1993
filing date -
Jul 1, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
An open loop desynchronizer (10) includes a demapper (12) that reads asynchronous data from a synchronous channel (14) and writes this data to a first in first out buffer (18). The demapper (12) decodes deviations from a nominal stuff bit rate that indicates whether fewer or more stuff bits than data bits are needed on the synchronous channel (14) and generates a frequency deviation control signal (20) therefrom. The frequency deviation control signal (20) drives a digital filter (22) and a numerically controlled oscillator (24). The digital filter (22) and numerically controlled oscillator (24) generate a transmit clock (26) that tracks the asynchronous payload rate according to unit pulses on the frequency deviation control signal (20). The first in first out buffer (18) transmits the asynchronous data over a transmit data line (28) according to the asynchronous payload rate generated on the transmit clock (26).
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