H - Electricity – 03 – L
Patent
H - Electricity
03
L
331/32
H03L 7/00 (2006.01) H03L 7/07 (2006.01) H03L 7/081 (2006.01) H04J 3/06 (2006.01)
Patent
CA 1182874
ABSTRACT "SYNCHRONISATION OF ELECTRICAL OSCILLATORS" A system for synchronising remote or co- located oscillators is constructed with redundancy enabling a high degree of fault toleration. In the various embodi- ments of the system there is no predetermined hierarcy amongst the oscillators in contrast to the prior art master and slave type of synchronisation. Averaging is not involved and the system settles to a state in which the oscillators are locked to one master, which is not predetermined. Each oscillator is part of a terminal which includes reconfiguration circuitry, and each, in the absence of faults, is connected to each of the other terminals. The terminals attempt to lock to another oscillator and recon- figure in accordance with an algorithm until stable synchronisation is achieved. In one embodiment the properties of a phase-locked loop are utilised in a novel way by incorporating a variable delay in its feed back path. Using this circuitry enables one embodiment to achieve synchroni- sation even when only indirect paths exist to the assumed master, and in the system temporary disconnection for reconfiguration is not necessary.
404623
British Telecommunications Public Limited Company
Ridout & Maybee Llp
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