The PolyPhaser PDWDM-LGXMDM-04156 is a DWDM Passive Filter with 4 DWDM Channels. The PolyPhaser PDWDM-LGXMDM-04156 is a standard LGX filter with Combo Mux/DeMux functionality. The PolyPhaser PDWDM-LGXMDM-04156 has 4 DWDM channels: ITU CH56-59 starting with Channel 56 (1532.68nm) and with 100GHz channel spacing. The PolyPhaser PDWDM-LGXMDM-04156 has LC/UPC connectors and has Monitor port option on Mux and Demux. The PolyPhaser PDWDM-LGXMDM-04156 also has an Express Channel for passing all DWDM channels not present on this filter through, making this a great upgradable solution. The PolyPhaser PDWDM-LGXMDM-04156 is a dual fiber filter with one sending muxed signal and the other receiving a composit 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.