GLC-LH-SMD LX/LH Gb Fiber SFP with digital optical monitoring (DOM).

Cisco GLC-LH-SMD - Overview

The GLC-LH-SMD is one of Cisco’s most widely deployed Gigabit SFP modules, offering flexible fiber connectivity for switches, routers, and other Cisco platforms. The “LH” stands for Long Haul, “SM” for Single-Mode, and “D” indicates DOM support.

🔧 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 with mode conditioning patch cable
• Data Rate: 1 Gbps line rate
• Digital Optical Monitoring (DOM): Yes (real-time monitoring of optical power, temperature, voltage, and laser bias)
• Compatibility: Supported across a wide range of Cisco Catalyst, Nexus, and MDS platforms

🧩 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