The CWDM/DWDM Multiplexers and De-multiplexers from Vialite Communications is a Multiplexer with Insertion Loss 3 to 10 dB, Isolation 25 to 35 dB, Return Loss 50 dB. Tags: Rack Mount. More details for CWDM/DWDM Multiplexers and De-multiplexers can be seen below.