Pulse or digital communications – Synchronizers
Patent
1994-09-13
1996-07-30
Chin, Stephen
Pulse or digital communications
Synchronizers
370 24, 375357, H04K 110, H04L 2728, H04L 700
Patent
active
055419623
ABSTRACT:
A transmission timing adjusting device is provided for a transmitting/receiving apparatus equipped with active and standby transmitting/receiving circuits for carrying out two-way communications via an identical communication path, wherein a switching from the active system to the standby system can be carried out without interrupting communications. The active transmitting/receiving circuit transmits a first transmission signal to a remote station, which in turn transmits a second transmission signal to the active and standby transmitting/receiving circuits. Active-side time detecting circuit detects a first time period from a first timing at which the first transmission signal is transmitted therefrom to a second timing at which the second transmission signal is received thereby. Standby-side time detecting circuit detects a second time period from the first timing to a third timing at which the second transmission signal is received thereby. Difference calculating circuit calculates the difference between the first and second time periods, and based on the calculated difference, transmission timing adjusting circuit adjusts the transmission timing of the standby transmitting/receiving circuit in advance.
REFERENCES:
patent: 4276637 (1981-06-01), Le Dieu
patent: 4730303 (1988-03-01), Suzuki
patent: 5229293 (1994-03-01), Mestdagh et al.
patent: 5406548 (1995-04-01), Itoh et al.
Chin Stephen
Fujitsu Limited
Webster Bryan
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