CWDM MUX DEMUX,Multiplexing up to 8 ch for single fiber BIDI transmission 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 Applied to Metro, Regional CWDM Networks