R
- RAI (remote alarm indication).
A code sent upstream in a DS-N network as a notification that a failure condition has been declared downstream; RAI signals were previously referred to as yellow signals.
- Raman amplification.
Optical amplification process throughout the actual transmission fiber in an optical network, caused by a carefully selected pump-laser wavelength scattering from atoms in the fiber and changing its wavelength to that of the optical signal.
- Rayleigh scattering.
Light scattering in an optical fiber due to slight changes in the core's refractive index.
- RDI (remote defect indication).
A signal returned to the transmitting-terminating equipment upon detecting a loss of signal, loss of frame, or AIS defect; RDI was previously known ...
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