The Cisco 10GBASE-LX4 Module supports link lengths of 300 m on standard Fiber Distributed Data Interface (FDDI) grade multimode fiber (MMF).
Cisco X2-10GB-LX4=, Laser Class 1 21CFR-1040 LN#50 7/2001; Laser Class 1 IEC60825-1, IEEE 802.3ae, 0 - 40 °C, -40 - 75 °C, 36 x 91 x 13,46 mm
Cisco X2-10GB-LX4=. Safety: Laser Class 1 21CFR-1040 LN#50 7/2001; Laser Class 1 IEC60825-1. Compliance industry standards: IEEE 802.3ae. Dimensions (WxDxH): 36 x 91 x 13,46 mm