1.dual fiber cwdm mux/demux 2.16 channel cwdm module ... and Demux in one unitLC Connectors (FC, SC also available)Dual fiber is used for both the network and the GBIC ... bandwidth +/- 6.5 nmInsertion Loss mux/demux pair (max) 4.8 dBIsolation (min) 30.0 dBPolarization Dependent Loss (max) 0.2 ... lightwave equipment including, Cisco, Nortel, Alcatel, Ciena, Fujitsu, etc. Dual Fiber 16-Channel CWDM Mux/Demux