Product Overview
The Cisco GLC-LH-SM is a 1000BASE-LX/LH SFP transceiver module designed for Gigabit Ethernet links over single-mode fiber (SMF). It supports data transmission up to 10 kilometers on standard SMF and up to 550 meters over multimode fiber (MMF) with mode conditioning patch cables. Operating at a 1310 nm wavelength, the GLC-LH-SM is ideal for enterprise backbones, data centers, and campus environments that require stable and long-reach fiber connectivity.
Product Details
| Specification | Description |
| Product Model | GLC-LH-SM |
| Form Factor | SFP (Small Form-Factor Pluggable) |
| Interface Type | 1000BASE-LX/LH |
| Data Rate | 1 Gbps |
| Wavelength | 1310 nm |
| Fiber Type | Single-Mode Fiber (SMF) and MMF (with MCP cable) |
| Connector Type | LC duplex |
| Max Distance (SMF) | Up to 10 km |
| Max Distance (MMF) | Up to 550 m (with mode conditioning patch cable) |
| Hot Swappable | Yes |
| DOM Support | No |
| Operating Temperature | 0°C to 70°C |
| Compliance | IEEE 802.3z, RoHS |
| Cisco Compatibility | Cisco Catalyst, ISR, Nexus, and more |
Product Features
Supports 1 Gbps Gigabit Ethernet over 1310 nm SMF links up to 10 km
Can also operate over MMF using mode conditioning patch cables
LC duplex connector for standardized fiber connectivity
Hot-swappable SFP design simplifies deployment and upgrades
Ideal for campus networks, enterprise cores, and long-reach wiring closets
Fully compliant with IEEE 802.3z (1000BASE-LX/LH)
Similar Models Comparison
| Model | Data Rate | Fiber Type | Max Distance | Wavelength | DOM | Connector |
| GLC-LH-SM | 1 Gbps | SMF/MMF (MCP) | 10 km / 550 m | 1310 nm | No | LC |
| GLC-LH-SMD | 1 Gbps | SMF/MMF (MCP) | 10 km / 550 m | 1310 nm | Yes | LC |
| GLC-SX-M MD | 1 Gbps | MMF | 550 m | 850 nm | Yes | LC |
| GLC-ZX-SMD | 1 Gbps | SMF | 80 km | 1550 nm | Yes | LC |
| GLC-BX-D | 1 Gbps | SMF | 10 km | 1490/1310 | No | LC |
Latest Cisco 1G Long-Reach SFP Modules
| Model | Fiber Type | Max Distance | Wavelength | DOM Support | Application |
| GLC-LH-SM | SMF/MMF | 10 km / 550 m | 1310 nm | No | Enterprise, campus networking |
| GLC-LH-SMD | SMF/MMF | 10 km / 550 m | 1310 nm | Yes | Enhanced diagnostics |
| GLC-ZX-SMD | SMF | 80 km | 1550 nm | Yes | Metro and long-haul backbone |
