| 摘要 |
A two-way communication system that can shorten the system recovery time when a link switching operation between a center station and a relay station occurs over two-way CATV networks, passive optical star networks and the like. A center station measures the round-trip propagation delay of a signal when a subscriber station starts its operation and then sets the transmission delay of the subscriber station so as to equalize the round-trip propagation delay to a fixed system delay. When a link switching operation occurs from a working system to a standby system, the center station measures the round-trip propagation delay of a signal for a subscriber station after the link switching operation and then resets transmission delays of all subscriber stations connected to the relay station to a time based on the difference between the measured delay and the round-trip propagation delay of a signal before the link switching operation.
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