A telecommunications assembly includes a chassis and a plurality of
optical wavelength division multiplexer/demultiplexer modules mounted
within the chassis. Each module includes at least one fiber optic
connector. Within an interior of the chassis are positioned at least one
fiber optic adapter. Inserting the modules through an opening of the
chassis at a mounting location positions the connector of the module for
insertion into and mating with the adapter of the chassis. A method of
mounting an optical wavelength division multiplexer/demultiplexer module
within a telecommunications chassis is also disclosed.