Patent ID: 11895000
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. A packet transfer method that is executed by a packet transfer apparatus, the method comprising:
obtaining time information from a system clock on a CPU region at a predetermined time interval;
periodically registering the obtained time information into a table and a hardware clock on a hardware region,
wherein periodically registering the obtained time information into the table and the hardware clock comprises:
updating the table and the hardware clock at the same time for the first time, and periodically updating only the table after the first time;
receiving a packet;

determining a receiving time using i) the time information periodically registered in the table on the hardware region and ii) a counter value of a hardware clock on the hardware region that indicates an elapsed time;
adding the receiving time to the received packet; and
transferring, to a transfer destination, the packet to which the receiving time has been added.