Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural oscillators controlled
Patent
1982-06-03
1985-06-04
LaRoche, Eugene R.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Plural oscillators controlled
331 25, 331 49, 375120, 455260, H03L 700
Patent
active
045217459
ABSTRACT:
A system for synchronizing remote or colocated oscillators is constructed with redundancy enabling a high degree of fault toleration. In the various embodiments of the system there is no predetermined hierarchy amongst the oscillators in contrast to the prior art master and slave type of synchronization. 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 reconfigure in accordance with an algorithm until stable synchronization is achieved. In one embodiment the properties of a phaselocked loop are utilized in a novel way by incorporating a variable delay in its feed back path. Using this circuitry enables one embodiment to achieve synchronization even when only indirect paths exist to the assumed master, and in the system temporary disconnection for reconfiguration is not necessary.
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Colloque International de Communication, May 7-11, 1979, Paris (FR) U. de Julio et al: "Objectifs de Synchronisation du Reseau National", pp. 559-566, * p. 560, right-hand column, line 1-p. 562, right-hand column, line 21, FIGS. 3, 4.
Gersho and Karafin in Bell Systems Technical Journal, Dec. 1966, pp. 1689-1705.
Proc IEEE, vol. 66, No. 10, Oct. 1978, by Hopkins et al, pp. 1225-1231-1232.
British Telecommunications
LaRoche Eugene R.
Pascal Robert J.
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