The Cisco ® Network Convergence System (NCS) 2000 400 Gbps XPonder line card dramatically enhance Dense Wavelength-Division Multiplexing (DWDM) transmission. The XPonder provides 400 Gbps of Client, and 400 Gbps of Trunk capacity on a single, two-slot wide line card capable of mapping Client traffic to either of two 200 Gbps Trunk ports, or into a 400G dual-wavelength super-channel, all while leveraging software configurable Coherent modulation schemes.