The ComNet Ethernet CNMC2+1SFP electrical-to-optical Ethernet media converters accept two 10/100 or 1000Mbps electrical inputs and converts this to a single 100 or 1000Mbps optical output (selected by a DIP switch) and the 100/1000Mbps optical input back to the 10/100/1000 Mbps electrical output. "Auto-Negotiating" is supported on the copper interface side. These devices use either one or two optical fibers, depending upon the selection of sold-separately SFP (Small Form-Factor Pluggable Module; sold separately) optical module. The ComNet exclusive Demux feature allows for port isolation, replicating two media converters over one fiber. The ComNet exclusive Mux feature prevents network video flooding of multicast traffic with DIP switch selection of the fiber port as a dedicated uplink path. The CNMC2+1SFP series can be powered by wide range of AC or DC input power supplies.