Data transmission system using specific pattern for synchronizat

Details Data transmission system using specific pattern for synchronizat Data transmission system using specific pattern for synchronizat

1994-12-15

1999-03-23

Pham, Chi H.

Pulse or digital communications

Synchronizers

Frequency or phase control using synchronizing signal

371 471, H04L 700

Patent

active

058870393

ABSTRACT:
Parallel digital data are transmitted along with a specific synchronization pattern added thereto. Each synchronization pattern adder adds the synchronization pattern at an equal timing for each channel. Parallel data after the synchronization pattern addition, are converted in parallel-to-serial converters into serial data which are in turn converted in an optical transmitter into optical signal. On the receiving side, the optical signal is converted in an optical receiver into an electric signal, from which the parallel data are restored in serial-to-parallel converters to be inputted to synchronization pattern detectors. The synchronization pattern detectors compare their shift register data and synchronization pattern and hold their synchronization pattern detection signal to be "1" for one time slot if the number of non-accord bits is within one. In the next time slot, a controller recognizes synchronization pattern detection when and only when all the synchronization pattern detection signals are "1". In this way, reliable synchronization pattern detection can be made regardless of the occurrence of any transmission error in the synchronization pattern.

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patent: 5210754 (1993-05-01), Takahashi et al.
patent: 5212690 (1993-05-01), Low
patent: 5276691 (1994-01-01), Kivari
Kaneko, "PCM Communication Techniques", pp. 109-116, Sanpoh, 1976.

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