GLC-LH-SM Cisco 1000BASE-LX/LH SFP Transceiver

Cisco GLC-LH-SM - Overview

The GLC-LH-SM is one of Cisco’s most common Gigabit SFP modules, designed for flexible fiber uplinks in enterprise, campus, and service provider networks. The “LH” stands for Long Haul, and “SM” indicates Single-Mode capability.

🔧 Key Specifications

• Form Factor: SFP (hot-swappable)
• Standard: IEEE 802.3z 1000BASE-LX/LH compliant
• Wavelength: 1310 nm (long wavelength laser)
• Connector: Duplex LC
• Fiber Type:
  • Single-mode fiber (SMF): up to 10 km reach
  • Multimode fiber (MMF): up to 550 m reach (requires mode conditioning patch cable for MMF)
• Data Rate: 1 Gbps line rate
• Compatibility: Supported across a wide range of Cisco Catalyst, Nexus, and MDS platforms
• Hot-Swappable: Yes, without disrupting system operation

🧩 Ideal Use Cases

• Enterprise LAN backbones needing reliable Gigabit fiber uplinks
• Campus networks interconnecting buildings over SMF
• Data centers requiring flexible MMF/SMF support
• Service provider edge deployments where 1G fiber links are still in use