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Abstract

The present invention relates to a method for switching dualized trunk lines, more particularly a method for switching dualized trunk lines using a hardware Watchdog function in communication equipments. According to the present invention, trunk interfacing boards are dualized so that a failure of the board does not lead to a failure of the trunk, and switching trunk resources is performed regardless of the failure status of a CPU. More specifically, a method for switching dualized trunk lines using a hardware Watchdog function, comprises the steps of: only monitoring the status of dualized boards via interfaces by a CPU between dualized trunk boards and between processors; performing a response function for a Keep Alive Signal received via trunk line sin real time not to affect a line bandwidth; performing a function for checking a line status and a function for cleaning a Watchdog register at the time of the response; resetting a Watchdog Timer by a sense device register monitoring logic when the CPU writes, which is configured by means of hardware; and generating a timeout in the Watchdog timer in the event that the CPU cannot perform a cleaning operation on the Watchdog register for a predetermined time, thereby switching line sand restarting resources within boards including the CPU. Accordingly, the present invention is a method for switching dualized trunk lines using a hardware watchdog function, which can be applied to a physical line interfacing that requires stability and reliability.

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First Claim