The terms "LX" and "LR" in the context of SFP (Small Form-Factor Pluggable) modules refer to different types of optical transceivers designed for specific applications and operating over different types of fiber. Here are the main differences between LX and LR SFP modules: 

1. LX (Long-Reach) SFP:

• LX typically stands for "Long-Reach" in the context of SFP modules.

• LX modules are commonly used for longer-distance connections, typically over multimode or single-mode fiber.

• For 1000BASE-LX (Gigabit Ethernet), the LX module supports a range of up to 550 meters over multimode fiber and up to 10 kilometers over single-mode fiber.

2. LR (Long-Range) SFP:

• LR typically stands for "Long-Range" in the context of SFP modules.

• LR modules are designed for longer-distance connections, usually over single-mode fiber.

• For 1000BASE-LR (Gigabit Ethernet), the LR module supports a longer reach compared to LX, typically up to 10 kilometers.

It's important to note that the terminology and specifications can vary between different data rates (e.g., 1 Gigabit, 10 Gigabit, 100 Gigabit) and standards (e.g., Ethernet, Fibre Channel). For instance:

• For 10 Gigabit Ethernet, you might encounter terms like 10GBASE-LX and 10GBASE-LR, each with specific reach characteristics.

• For 100 Gigabit Ethernet, you might see modules like 100GBASE-LX4, 100GBASE-LR4, each designed for different applications and distance requirements.

Always check the specific data rate, standard, and reach requirements of your network when selecting LX or LR SFP modules, and refer to the product documentation for accurate specifications.