H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/17
H04J 3/06 (2006.01) H04J 3/12 (2006.01)
Patent
CA 1279734
ABSTRACT OF THE DISCLOSURE A method of modulating a DS3 signal for addition thereto of an auxiliary, transparent signalling channel, the DS3 signal having frame-finding bits (F-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 F-bit error onto every D-spaced F-bit of the DS3 signal during an initial ON period of a 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 during demodulation, and wherein the Modulation Spacing, D, is selected so as to provide a low probability of coincidence between the F-bit Modulation Spacing and a verification window following a secondary reframing hunt.
538090
Alberta Telecommunications Research Centre
Proulx Eugene E.
LandOfFree
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