10GBASE-LR, as defined by the IEEE 802. 3ae standard, is a 10 Gigabit Ethernet (10GbE) specification designed for long-range data transmission over single-mode fiber (SMF). 10G-LR module has become one of the most widely. A broad range of industry-compliant SFP+ modules for 10 Gigabit Ethernet deployments in diverse networking environments. For example, SFP-10G-BXD1 must be used with SFP-10G-BXU1. Choosing the proper SFP+ module, whether it be SR, LR, or ER, can have significant impacts on performance, reliability, and costs.