Method and apparatus for frame-bit modulation and demodulation of DS3 signal
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United States of America Patent
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Oct 30, 1990
Grant Date -
N/A
app pub date -
May 26, 1988
filing date -
May 27, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of modulating a DS3 signal for addition thereto of an auxiliary, transparent signalling channel, the DS3 signal having framing bits which provide a predetermined pattern for which frame-finding circuits hunt to demultiplex the payload of the DS3 signal. The method comprises cyclically forcing an framing-bit error onto every D-spaced framing-bit of the DS3 signal during an initial ON period of an ON-oFF modulation cycle, the ON period and the modulation cycle having lengths such that no more than two verification attempts are required to complete reframing of the signal in the presence of the framing-bit modulation, and wherein the Modulation Spacing, D, is selected so as to provide a low probability of coincidence between the framing-bit Modulation Spacing and a verification window following a secondary reframing hunt.
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