Second pulses are used for realizing management core and metering core clock synchronization processing, the defect that the management core clock is inaccurate as the clock information of the metering core and the clock information of the management core are inconsistent can be effectively avoided, synchronization between the metering core clock information and the management core clock information can be realized, the accuracy of the management core clock information is effectively ensured, and accurate clock information is provided for metering and billing.