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Abstract

An X.25 network connection for X.25 protocol communication used in a full electronic switching system comprises: a microprocessor; a switching system interface circuit provided with a controller serving as master or slave relative to a main bus to convert the X.25 packet data from the X.25 network into IPC format data which is transferred to the switching system; a plurality of X.25 network interface circuits, each provided with a controller serving as master or slave relative to the main bus to convert the IPC format data into the X.25 packet data transferred to the X.25 network; a packet memory for temporarily storing the IPC format data from the switching system interface circuit and the X.25 packet data from the X.25 network interface circuits under the control of the MPU and controllers; a system memory for storing the system control program and application programs thereof and the data from the packet memory, for the MPU to analyze the IPC format data and X.25 format packet data; and a bus control circuit for controlling the input/output direction of the data and addresses of the internal circuits while preventing the collision of the data and addresses through the main bus.

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