The 40G Ethernet specification requires 8-core interconnection, 4 of 4 admission, recommended 12 core fiber optic cabling solutions, each channel has four dedicated fiber optic transmitter and four dedicated receiver optical fiber, optical fiber among four remain idle. The 40G Ethernet specification requires 8-core interconnection, 4 of 4 admission, recommended 12 core fiber optic cabling solutions, each channel has four dedicated fiber optic transmitter and four dedicated receiver optical fiber, optical fiber among four remain idle.