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Since signal detect works on light energy alone, there does not need to be valid data on the fiber receiver for there to be an output from the transmitter. If there is valid data present on the fiber receiver, it is copied to the fiber transmitter. This preserves data transparency but not necessarily protocol transparency. The outgoing protocol is always serial FPDP. AGE1439_FIBER_MODE_RAW transmits unprocessed and unbuffered ADC data over the fiber interface. After selection, optical data trans