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

Claim 0:
1. A packet transfer apparatus comprising one or more processors configured to:
obtain time information from a system clock on a CPU region at a predetermined time interval;
periodically register 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;

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