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Optical modules LH and LX

LX and LH SFP modules are functionally similar, both operating at 1310 nm over single-mode fiber, with LX being an IEEE standard and LH a vendor-specific term for long-haul applications.Overview of LX and LH

LX (Long Wavelength) is an IEEE 802.3z standard for Gigabit Ethernet over fiber. It typically operates at a 1310 nm wavelength and is designed for single-mode fiber (SMF), supporting distances up to 10 km. LX modules can also work over multimode fiber (MMF) for shorter distances (up to 550 meters) when using a Mode Conditioning Patch Cable (MCP) to prevent Differential Mode Delay (DMD) errors . LH (Long Haul) is a vendor-specific term, most commonly used by Cisco, to indicate modules that meet or exceed LX specifications. LH modules also operate at 1310 nm and are designed for SMF, with typical distances ranging from 10 km to 20 km, depending on the vendor. LH modules were historically marketed to signal higher-quality optics or slightly longer reach than standard LX modules .

Key Similarities
  • Both LX and LH modules use 1310 nm wavelength and support 1 Gbps Gigabit Ethernet.
  • Both are compatible with single-mode fiber and can be adapted for multimode fiber with MCP cables.
  • LX and LH modules are interoperable, meaning an LX module can connect to an LH module without issues .
Key DifferencesFeatureLXLHStandardIEEE 802.3zVendor-specific (e.g., Cisco)Typical DistanceUp to 10 km on SMF10–20 km on SMF (varies by vendor)Fiber TypeSMF (compatible with MMF using MCP)SMFPurposeMedium- to long-distance linksLong-haul or marketing distinction for extended reachPractical Considerations
  • For generic networks: LX modules are a safe choice for standard 10 km connections.
  • For Cisco networks: LH modules like the GLC-LH-SMD are recommended, offering Digital Diagnostics Monitoring (DDM) and compatibility with LX standards.
  • Multimode fiber deployment: Always use a Mode Conditioning Patch Cable to avoid signal instability when using LX or LH modules on MMF .
Summary

While LX is a formal IEEE standard and LH is a vendor-specific designation, in practice, they are functionally equivalent for most 1G applications. The choice between them usually depends on vendor compatibility, network equipment, and desired distance, rather than fundamental technical differences .

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Technical note

This reference is intended for preliminary specialty-cable research. Compatibility, link budgets, fire performance, installation methods, test limits and applicable standards must be verified for the specific project.

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