| 摘要 |
Provided is an optical interface which can continuously perform data transmission even in the case where an optical fiber cable breaks down, and can achieve a highly reliable transmission system. The optical interface is for converting full duplex high-speed serial electric signals and the like complied with an IEEE1394.b to optical signals. The optical interface comprises: a double transmission line made up of a main transmission line and a spare transmission line; an malfunction detection unit for detecting a transmission malfunction occurring in the main transmission line; and a switching unit for switching the transmission line from the main transmission line to the spare transmission line when the malfunction detection unit detects a transmission malfunction in the main transmission line. The malfunction detection unit monitors, periodically, the state of signal detection signals transmitted from photoelectric conversion units provided in each of the main transmission line and the spare transmission line.
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