Pulse or digital communications – Repeaters – Testing
Patent
1991-05-28
1993-06-22
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375117, H04L 2549
Patent
active
052221024
ABSTRACT:
Apparatus generates synchronized timing for both the up and down links of a transmission path such as a telephone line, which telephone line carries bipolar data. The apparatus operates to detect a Start of Frame signal which signal constitutes a known violation in the bipolar data. This Start of Frame signal is applied to a series of dividers and decoders which operate in conjunction with an oscillator to produce a series of timing signals related to the Start of Frame signal. A selected one of the timing signals is utilized to synchronize the up link apparatus to the down link apparatus. In this manner the counter circuitry which is employed in both the down link side and the up link side is used to accumulate any timing difference between the data source and the data receiver. After a number of bit periods have passed, the timing signals generated will move with respect to a data bit, depending on whether the clock at the transmitting end is slower or faster than the clock at the receiving end. The operation causes the receiving end to synchronize with the transmitting end.
REFERENCES:
patent: 4408325 (1983-10-01), Grover
patent: 5014270 (1991-05-01), Sillere
patent: 5040190 (1991-08-01), Smith et al.
Chin Stephen
ROLM Company
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