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18221-A ADCP-75-169 • Issue 1 • June 2004 18824-A Figure 4. Expansion Panel 3.2 Wavelength Division Multiplexer System The Wavelength Division Multiplexer (WDM) system is an accessory product that is used when it is desirable or necessary to combine the forward and reverse path optical signals from one Digivance system onto a single optical fiber. Each WDM system consists of a host module and a remote module. The HU provides a mounting slot for installing a WDM host module. Both the RU outdoor c