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Configured dual processor architecture
In centralized SPC, dual processor architecture can be configured to operate in following one of three modes:
1. Standby mode: In this mode, one processor is active and the other one is on standby, both software and hardware wise. The standby processor brought online when active processor fails. A significant requirement of this configuration is ability of standby processor to reconstitute state of the exchange system when it takes over the control.
2. Synchronous duplex mode: In synchronous duplex mode, hardware coupling is provided between two processors that execute the same set of instructions and compare results continuously. If a mismatch takes place, faculty processor is identified and taken out of service immediately. When system is operating normally, two processors have the same data in their memories at all the times and receive all information from exchangeenvironment.
3. Load Sharing mode; In load sharing operation, an incoming call is assigned randomly or in a predetermined order to one of the processors which then handles call right through completion. Hence both processors are active simultaneously and share the load and resources dynamically.
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