Pulse width modulated self-clocking and self-synchronizing data transmission and method for a telephonic communication network switching system
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United States of America Patent
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Aug 18, 1992
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N/A
app pub date -
Sep 29, 1989
filing date -
Sep 29, 1989
priority date (Note) -
Expired
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Abstract
Transmissions of synchronous digital data from a master control unit (50A) to a slave, network termination unit (50B) are via a pulse width modulated data stream including pulse width modulated binary code pulses (20, 22) with a pulse width modulated synchronization pulse (24) all of which have a preselected leading edge transition (28) at the same point in each cycle of a master clock signal. A clock signal is derived at the network termination unit (50B) from the received pulse width modulated binary data stream for decoding and for nonself-clocking, synchronous transmissions from the slave, network termination unit (50B) to the master, control unit (50A). The phase synchronization pulse (24) is employed to maintain phase sychronization between the transmission to and from the control unit (50A).
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