The LevelOne Quad Small Form-factor Pluggable (QSFP) active optic cable is further increase performance for applications that are I/O-intensive for 40G Ethernet. This connecting system offer 4 channels and maximun 40Gbps which are based on the proprietary technique Chip on board (COB), This module provides high performance and excellent efficiency in optical communication, offers system developers and planners a high degree of flexibility.