18 Channels 1270-1610nm, with Monitor Port, LC/UPC, Dual Fiber CWDM Mux Demux, 1U Rack Mount (used) for $400 Brand: FS Item Spotlights 1% Monitor Port for Signal Analyzing or Troubleshooting Passive, Protocol Transparent for Ethernet, FC, OTN, SONET/SDH, etc. Fully Compatible with All ITU-T 1G/10G/25G CWDM Optics Multiplexing up to 18 Channels on Fiber Pair Applied to Metro, Regional CWDM Networks