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How far can 1G LX SFP go?
Knowledge Base + 2024.01.09

The reach of an SFP (Small Form-Factor Pluggable) transceiver, including 1G LX (1 Gigabit Long-Reach) SFP, depends on the specific type of fiber optic cable and the environmental conditions. The LX designation indicates that the SFP module is designed for long-distance connections. Here are general guidelines for the reach of 1G LX SFP:

  1. Multimode Fiber (MMF):

    • Typically, 1G LX SFP modules are not optimized for multimode fiber (MMF) connections. They are primarily designed for use with single-mode fiber (SMF).

  2. Single-Mode Fiber (SMF):

    • 1G LX SFP modules are intended for use with single-mode fiber, and they can support longer distances compared to multimode fiber.

    • The reach of 1G LX SFP over single-mode fiber is commonly up to 10 kilometers (km) or more. Some specifications may indicate a reach of 10 km or 20 km.

  3. Environmental Conditions:

    • The actual reach may be influenced by factors such as the quality of the fiber optic cable, connectors, and the overall optical link budget.

    • Environmental conditions, such as signal attenuation due to bends, splices, or other factors, can also impact the effective reach of the SFP module.

It's important to note that the specified reach is a general guideline, and the actual achievable distance can vary based on the specific implementation and environmental factors. When deploying 1G LX SFP transceivers, it is recommended to adhere to the manufacturer's specifications and guidelines. Always consider the quality of the fiber optic infrastructure, the compatibility of components, and any additional factors that may affect signal integrity and reach.