Multiplex communications – Wide area network – Packet switching
Patent
1988-05-26
1990-10-30
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701104, 3701051, H04J 304, H04J 306
Patent
active
049674110
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.
REFERENCES:
patent: 4243930 (1981-01-01), DeCoursey
patent: 4387460 (1983-06-01), Boutmy et al.
patent: 4404675 (1983-09-01), Karchevski
patent: 4408325 (1983-10-01), Grover
patent: 4430731 (1984-02-01), Gimple et al.
patent: 4747112 (1988-05-01), Blondeau, Jr. et al.
Alberta Telecommunications Research Centre
Jung Min
Olms Douglas W.
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