The central processor is the heart of a program-controlled exchange. It executes the stored instructions that manage all exchange operations, including call setup, routing, signaling, and supervision of lines and trunks. The CPU handles real-time processing of multiple simultaneous events, often using interrupt-driven mechanisms to prioritize urgent tasks such as incoming calls over routine maintenance. In modern SPC systems, processors may be duplicated or configured in active-standby modes to ensure reliability and fault tolerance .
The memory system stores both the program instructions and dynamic data required for exchange operations. It typically includes:
The CPU fetches instructions from the program store and processes data from the data store to control the switching network. Peripheral devices, such as scanners and distributors, interface with the CPU to detect line states and send control signals to switches. This combination of processor and memory enables flexible, programmable control of the exchange, allowing features like call forwarding, abbreviated dialing, and dynamic routing . In summary, a program-controlled exchange relies fundamentally on the central processor to execute control logic and the memory system to store instructions and call-related data, forming the backbone of modern electronic switching systems.
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