| 摘要 |
When entering an idling state, a master unit M transmits an optical signal for polling addressed to each slave unit S- 1 to S-n. The slave unit S-n located at the lowest rank of a direct chain constituted by S- 1 to S-n, when receiving the optical signal for polling for the self unit, responds by transmitting an optical signal representing a phase correction request signal to the other slave units. The slave units S- 1 to S-(n-1) respond to the phase correction request signal, and initialize each clock signal to synchronize with the clock signal of the slave unit S-n at the lowest rank.
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