Patent ID: 6760395
Filing Date: 2004-07-06
Classification: H04J

Abstract:
A device for reconstructing the timing of a stream of constant frequency data transported on a packet network, inclusive of a memory (2) for accumulation of the data of said stream, said memory featuring:an input (3) whose data are entered as a stream of input data (Pin) under control of an input timing signal (XM), and an output (4) starting from which said data are read as a stream of output data (Pout) under control of a reconstructed timing signal (Xout), said device comprising a phase-locked loop (7) having means (9, 10) for selective band (B) variation of a transfer function of said phase-locked loop (7) and that uses said input timing signal (XIN) and an input signal to be locked to generate a corresponding output signal in lock conditions (Xout), said reconstructed timing signal being obtained starting from said phase-locked loop (7) output signal; and measurement means (22) of the residual wander (Aw) present in said reconstructed timing signal (Xout) being capable of calculating the level of said residual wander from a second derivative of said reconstructed synchronization signal (Xout) and of acting on said means (9, 10) for selective band (B) variation of this transfer function of said phase-locked loop (7) to reduce said band (B) when the level of said residual wander increases beyond a preset threshold.