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Abstract

A fault detection system transfers the control of the telephone exchange from the presently on line common data bus and its associated dedicated subsystems over to an off line common data bus and its associated dedicated subsystems. The fault detection system comprises a monitoring means for monitoring the operation of the on line common data bus and its associated dedicated subsystems for providing a first multiple bit status word indicative of the operative conditions of the on line common data bus and its associated dedicated subsystems, means coupled to the monitoring means for storing the first multiple bit status word, status word updating means coupled to the monitoring means and the storing means for updating the first status word to indicate the current operative status of the on line common data bus and associated dedicated subsystems and for setting a bit within the first status word indicating a request for a first test routine, and means for transmitting the first status word to the on line central processor for causing it to obtain a first test instruction from its program memory and for acting thereupon. The fault detection system additionally comprises clock means coupled to the monitoring means for setting a predetermined time period and for providing a control signal when the on line common bus and its associated dedicated subsystems fail to complete the first test instruction routine within the predetermined time and transfer means coupled to the clock means and to the dedicated subsystems for transferring the control of the telephone exchange from the on line common data bus and its associated dedicated subsystems over to the off line common data bus and its associated dedicated subsystems in response to the control signal.

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First Claim

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• 15 United States
• 10 France
• 8 Japan
• 7 China
• 5 Korea
• 2 Other