Network system and communication device

摘要

It is ensured to prevent a user from misrepresenting a time stamp, and to send out packets in sequence in which the packets are accepted to all users who are geographically isolated from each other. A unique time stamp impartation function is realized by respective communication devices on a net inside an administrative responsibility range of a communication common carrier, hardly accessible by a user. If a packet with a time stamp imparted by a subscriber terminal, provided thereto, is received, the respective communication devices positioned on the net inside the administrative responsibility range nullify the relevant time stamp in order to prevent misrepresentation of the time stamp, by a user outside the administrative responsibility range, and restores the packet from the subscriber together with the time stamp when transferring the packet to the outside of the administrative responsibility range.

主权项

1. A network system comprising:
a first communication node, a second communication node, and a third communication node, located in a network; wherein the first communication node comprises: a first receiving unit that receives a first packet from outside of the network; a first sequence information adding unit that adds first internal sequence information to the first packet, wherein the first internal sequence information is in time synchronization with other communication nodes; and a first sending unit that sends the first packet with the added first internal sequence information to the third communication node; wherein the second communication node comprises: a second receiving unit that receives a second packet from outside of the network; a second sequence information adding unit that adds second internal sequence information to the second packet, wherein the second internal sequence information is in time synchronization with other communication nodes; and a second sending unit that sends the second packet with the added second internal sequence information to the third communication node; wherein the third communication node comprises: a third receiving unit that receives the first packet with the added first internal sequence information from the first communication node via the network and the second packet with the second internal sequence information from the second communication node via the network; and a third sending unit that sends the first packet and the second packet based on an order of the first internal sequence information and the second internal sequence information to outside of the network; and wherein the first communication node further comprises a delay insertion unit that causes the first packet to be delayed by a predetermined time according to an address of the first packet before sending the first packet to the third communication node.