The Cisco CRS-1 1-Port OC-768c/STM-256c Tunable WDMPOS Interface Module helps service providers to increase efficiencies, improve reliability, and reduce operational and capital costs by eliminating expensive and bulky optical transponder equipment, even as video-based applications rapidly increase traffic in their DWDM networks. The module connects directly into any DWDM network and provides up to 40 Gbps of data throughput across existing 10-Gbps DWDM systems. The module is completely tunable across the C band with 50-GHz spacing and supports high-gain Enhanced Forward Error Correction (EFEC), extending reach up to 1000 kilometers without requiring signal regeneration.