Open fiber control

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In telecommunication, Open fiber control is a protocol to ensure that both ends of a fiber optic cable are connected before laser signals are transmitted in order to protect people from eye damage. When a device is turned on, it sends out low powered light. If it does not receive light back, it assumes that the fiber is not connected. When it receives light, it assumes that both ends of the fiber are connected and it switches the laser to full power. If one of the devices stops receiving light, it will revert to the low power mode.[1]


  1. ^ Introduction to Storage Area Networks. Fourth Edition (July 2006). IBM Redbook.