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.
Famous quotes containing the words open, fiber and/or control:
“Through open doors, the dining-room declares
A larger loneliness of knives and glass
And silence laid like carpet.”
—Philip Larkin (1922–1986)
“I am an invisible man.... I am a man of substance, of flesh and bone, fiber and liquids—and I might even be said to possess a mind. I am invisible, understand, simply because people refuse to see me.”
—Ralph Ellison (b. 1914)
“To try to control a nine-month-old’s clinginess by forcing him away is a mistake, because it counteracts a normal part of the child’s development. To think that the child is clinging to you because he is spoiled is nonsense. Clinginess is not a discipline issue, at least not in the sense of correcting a wrongdoing.”
—Lawrence Balter (20th century)