H - Electricity – 04 – L
Patent
H - Electricity
04
L
328/88, 340/92
H04L 7/04 (2006.01) H04J 3/06 (2006.01)
Patent
CA 1101512
ABSTRACT OF THE DISCLOSURE The invention provides a device for providing phase synchronism of a transit station in a digital telecommunication network, comprising a voltage-controlled oscillator within a phase-locked loop that has an output arranged to supply a station clock signal and a control input adapted to receive a signal derived from the line clock signals associated with a plurality of incoming lines from other transit stations in the telecommunication network, and a phase comparator that is arranged to compare the phase of the station clock signal with the phases of the line clock signals and has an output connected to the control input of the voltage controlled oscillator via a loop filter, the loop filter comprising memory means having an address input and a read output and arranged to store selected weighting coefficients for the line clock signals, an address counter having an input connected to the output of the voltage- controlled oscillator and an output arranged for a cyclic read out of address words allotted to said incoming lines and connected to the address input of the memory means, and a multiplier having a first input connected to the output of the phase comparator, a second input connected to the read output of the memory means and an output connected to the control input of the voltage-controlled oscillator via an averaging means, a time multiplexor stage being connected between said incoming lines and the phase comparator and having an address input connected to the output of the address counter.
276507
Anas Johan
Ghisler Walter
Marlevi Aleksander
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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