The  Gigabit Ethernet Multiplexer aggregates 2 port Gigabit Ethernet into 1 port 2.5G uplink, reducing the conversion CAPEX and increasing the fiber utilization effectively. The multiplexer can be used either in point-to-point topology fuctioning as a media converter for transporting two Gigabit Ethernet services over one fiber or in CWDM system working as a wavelength converter for extending the system’s transmits- sion capacity doubly. The multiplexer is equipped with three SFP-based ports: SFP1 is 2.5G uplink port, SFP2 and SFP3 are Gigabit Ethernet service ports.The multiplexer must be used in couples.