| 摘要 |
Provided is a communication system that can lower the degradation of service qualities caused by the delays of data packets in packet communications. According to a communication system of the invention: the difference in transfer time between the communication path of a currently used channel and the communication path of a standby channel is measured in advance; it is arranged that under circumstances where no congestions have occurred, communication packets transmitted via the communication path of the currently used channel and communication packets transmitted via the communication path of the standby channel should reach a communication control apparatus on the receiving side nearly at the same time; a delay amount of a control packet transmitted via the communication path of the currently used channel is measured with reference to a control packet transmitted via the communication path of the standby channel; and when the measured delay amount exceeds a predetermined threshold value, the communication path of data packets is switched from the currently used channel to the standby channel.
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