The PolyPhaser PCWDM-LGXMDM-42055 is a CWDM Passive Filter with 4 CWDM Channels. The PolyPhaser PCWDM-LGXMDM-42055 is a single HU LGX cassette filter with Combo Mux & DeMux functionality. The PolyPhaser PCWDM-LGXMDM-42055 has 4 channels: 1551, 1571, 1591, and 1611nm, starting with 1551nm and with 20nm spacing. The PolyPhaser PCWDM-LGXMDM-42055 has LC/UPC connectors and has Monitor port option on Mux and Demux and a PASS port to carry the unused CWDM channels through. The PolyPhaser PCWDM-LGXMDM-42055 is a dual fiber filter with one sending muxed signal and the other receiving a composite signal for demuxing. PolyPhaser produces the high quality passive filters that your business can rely on. With products continually in stock and same-day shipping, our expert technical support and knowledgeable sales team can get you to the right parts for the job.