| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication system which maintains a first network media device and a second network media device that is a redundant network media device in the almost same encrypted state. SOLUTION: Receiving switchover parameters and transmission switchover parameters are copied from the first network media device to the redundant network media device at least once whenever 2<SP>X</SP>packets are transmitted from the first network media device or received by the first network media device, so that the same encrypted state can be maintained. The redundant network media device can receive packets by using the copied receiving switchover parameters, or transmit packets by estimating transmission switchover parameters based on the copied transmission switchover parameters. COPYRIGHT: (C)2008,JPO&INPIT |
