Description The H3C QSFP-40G-ER4-SM1310 compatible module delivers robust 40Gb/s performance over a 40km span using single-mode fiber (SMF). Built with a 1310nm nominal wavelength and a duplex LC connector, it supports full Digital Optical Monitoring (DOM). This transceiver provides an efficient and high-performance interconnect for long-haul H3C networking links.