OADM (Optical Add/Drop Multiplexer)

In wavelength division multiplexing (WDM) a device

that is able to add or drop individual wavelengths without separating all wavelengths and certainly without converting them to electrical format. An OADM is a purely optical version of an ADM. See also ADM, wavelength, and WDM.

• network-to-network interface (NNI)
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