10GBASE-LR module supports a link length of 10 kilometers on standard single-mode fiber (SMF, G.652).
Cisco X2-10GB-LR=, IEEE 802.3ae, Laser Class 1 21CFR-1040 LN#50 7/2001; Laser Class 1 IEC60825-1, 0 - 40 °C, -40 - 75 °C, 36 x 91 x 13.46 mm
Cisco X2-10GB-LR=. Compliance industry standards: IEEE 802.3ae. Safety: Laser Class 1 21CFR-1040 LN#50 7/2001; Laser Class 1 IEC60825-1. Dimensions (WxDxH): 36 x 91 x 13.46 mm