Hierarchic synchronization method and circuit arrangement for exchanges of a mesh telecommunication network
First Claim
1. A hierarchical synchronization method for a mesh network of telecommunications exchanges wherein the synchronizing clock pulses of each exchange are assigned a class identification corresponding to a hierarchical synchronization order of the exchanges in the network, such method comprising:
- assigning to each exchange a synchronization identification signifying the relative priority of the clock pulses of such exchange in relation to clock pulses of other exchanges in said network;
transmission by each exchange of its class and synchronization identifications to all exchanges connected thereto;
determination in each exchange, from the class and synchronization identifications received thereby, of the exchange connected thereto having the highest class identification and the highest synchronization identification in such class, the synchronizing clock pulses of such highest order exchange being master clock pulses for exchanges connected thereto; and
reception in each exchange of master clock pulses from the highest order exchange connected thereto and use of such master clock pulses by the receiving exchange for synchronizing the receiving exchange.
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Accused Products
Abstract
In a mesh telecommunication network in which a hierarchic synchronization method is used for synchronizing the clock pulses of exchanges in such network, a class identification is assigned to the clock pulses of each echange corresponding to a hierarchical order of all the exchanges in the network. To maintain synchronization regardless of changes in the network configuration or failure of interconnecting lines, a synchronization identification is additionally assigned to each exchange. Each exchange transmits its class and synchronization identifications to the exchanges connected thereto, and all the identification received at any exchange are compared to determine the exchange connected thereto having the highest class identification and the highest synchronization identification in such class. The sychronizing clock pulses of such highest order exchange are then used for synchronization. Each exchange may also add to its identifications a mark to distinguish different operating conditions of the network. The reception at each exchange of the class and synchronization identifications transmitted by exchanges connected thereto is effected within presettable time intervals.
41 Citations
6 Claims
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1. A hierarchical synchronization method for a mesh network of telecommunications exchanges wherein the synchronizing clock pulses of each exchange are assigned a class identification corresponding to a hierarchical synchronization order of the exchanges in the network, such method comprising:
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assigning to each exchange a synchronization identification signifying the relative priority of the clock pulses of such exchange in relation to clock pulses of other exchanges in said network; transmission by each exchange of its class and synchronization identifications to all exchanges connected thereto; determination in each exchange, from the class and synchronization identifications received thereby, of the exchange connected thereto having the highest class identification and the highest synchronization identification in such class, the synchronizing clock pulses of such highest order exchange being master clock pulses for exchanges connected thereto; and reception in each exchange of master clock pulses from the highest order exchange connected thereto and use of such master clock pulses by the receiving exchange for synchronizing the receiving exchange. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification