| 摘要 |
A device including a line interface for additionally installing a line is installed in a terminal repeater device which takes a work and protection redundancy configuration based on a criterion such as SONET, SDH, or the like. Within the device additionally installed, the clocks supplied from work and protection devices are each compared. The respective clocks are variably delayed based on the comparison result so as to allow the device additionally installed to perform clock phase control as to the work and protection lines.
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