Patent ID: 7603423
Filing Date: 2009-10-13
Classification: H04L

Abstract:
1. A communication system comprising: two write devices configured to write data into a storage device, wherein when one of said write devices is in an operational state the other of said write devices is in a standby state, and when data is received at the communication system, the one of said write devices that is in the operational state writes the received data into said storage device: a transfer device; and a data save device, wherein said transfer device comprises: a first receiving device to receive data for said communication system; and a transfer apparatus to transfer said data received by said first receiving device to said data save device during a switching period lasting from commencement to completion of an operation for switching from one of said write devices that is in an operational state to the other of said write devices that is in a standby state, said data being transferred to said write device that is in said operational state at a time prior to said switching period or subsequent to said switching period, and said switching period being a period in which said two write devices are unavailable, wherein said data save device comprises: a second receiving device to receive said data transferred from said transfer apparatus; a storage device to store said data received by said second receiving device; and a transmission device to transmit, when said switching period is completed, said data stored in said storage device to said write device that is in said operational state.