Serial link transparent mode disparity control

Details Serial link transparent mode disparity control Serial link transparent mode disparity control

1988-12-19

1989-08-22

Schreyer, Stafford D.

Telegraphy

Systems

Line-clearing and circuit maintenance

371 52, 375 19, H04L 110, H04L 2549

Patent

active

048598151

ABSTRACT:
In a serial link in which it is necessary to occupy the link before and after transmission of a frame by sending a succession idle characters having alternating disparity effects, the disparity effect of the last character in the frame is compared with the disparity effect that would be produced by a disparity flip-flop, which has continued to step during frame transmission. If the disparity effect of these two characters match, no corrective action is required in order to resume the stream of idle characters. If the disparity effect of these characters differ, the disparity flip-flop is corrected before the stream of idle characters is resumed. Disclosed is hardware logic to accomplish this disparity control following transmission of frames in a transparent mode.

REFERENCES:
patent: 4486739 (1984-12-01), Franaszek et al.
patent: 4620311 (1986-10-01), Schouhamerlmmink

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