Optical add / drop CWDM multiplexer Add/drop 1 to 4 channels from both directions in a CWDM fiber link, all other channels pass through available for dual fiber or single fiber systems Easy to install, requires no configuration or maintenance Environmentally friendly product, completely passive, no power and no cooling required for operation! Low insertion loss - high isolation Disassembles easily for cleaning Fully Universal, bidirectional operation on any port OTDR friendly